Manual / Guide · 1970
Technical Manual Motor Units Teletype Bulletin 295B 1970
28 motor units incl. starting capacitor part numbers
Manual / Guide · 1970
28 motor units incl. starting capacitor part numbers
( <}{. f ( BULLETIN 295B ' TECHNICAL MANUAL MOTOR UNITS (MU, LMU AND YMU) ( ( TELETYPE® ( CORPORATION !5!5!5!5 TOUHY AVENUI!, SKOKII!, ILLINOIS l SEE INDIVIDUAL SECTIONS FOR COMIGHT NOTICES. Printed ln U. 8. A. ----., 295B ( ' INTRODUCTION ( Bulletin 295B is a technical manual that provides descriptive and maintenance information for the Motor Units. ( sections. The bulletin is made up of a group of appropriate independent They are separately identified by title and section number, and the pages of each section are numbered consecutively, independent of other sections. The identifying number of a section, a £\-digit number, appears on each page of the section, in the upper left corner of left-hand pages and the upper right corner of right-hand pages. To locate specific information, refer to the table of contents. Find the name of the involved component in column one and the title of the section in column two. The correct 9-digit section will then be found in column three. The sections are arranged in the order shown in the table of contents. Turn to page one of the section indicated where the contents of that section will be found (except where a section is ( small and does not require a listing of contents). The sections comprising this bulletin are stocked separately and may be ordered individually if the entire bulletin is not required. ( ( ( 295B D ecember 1970 Change 3 ( ( ( TABLE OF CONTENTS Equipment Contents Motor Units Description and Section Issue 570-220-100TC 4 Principles of Operation Motors and Motor Units Requirements and Adjustments 570-220-700TC 5 Motor Units Lubrication 570-220-701TC 5 Disassembly and 5'70-220-702TC 1 570-220-SOOTC 4 Motor Units Reassembly Motor Units ( ( ( (, Parts TELETYPE t:UH.PORATION Skokie, lllinois, U.S.A. SECTION 57G-22G-100TC Issue 4, October 1970 MOTOR UNITS DESCRIPTION AND PRINCIPLES OF OPERATION CONTENTS PAGE 1. GENERAL . . . . . . . . • • • . • • • • 1 2. DESCRIPTION . • . • . • • • • • • • • . • • 1 • • . . • . SYNCHRONOUS MOTOR UNITS A. Miniature Synchronous Motor Units Standard and Heavy Duty Synchronous Motor Units • B. . • • . • • . • . • • • • A. B. . . . . . . . . • . . . • • 2 D. . . . . . . . . . . . . . 3 • 1/20 Horsepower Motor Units (AC/DC and AC Only) 1/20 Horsepower Motor Units Variable Speed (AC/DC and AC Only) 1/15 Horsepower Motor Units (AC/DC and AC Only) 1/15 Horsepower Motor Units (DC) . C. . • . . . . • . . . . . . . . . • • . • • . • . • • • . • . • . • • . . . . . • . . 5 • . . . . . • • 5 • SYNCHRONOUS MOTOR UNITS • • • • • • • • 4 13 13 SERIES GOVERNED MOTOR UNITS . . . . . . . . . . . . . . . . . . . . . 15 SERIES GOVERNED MOTOR UNITS VARIABLE SPEED 17 . • • • • • The synchronous type motor units (Figures 1, 2, and 3) are available in minia ture (25 millihorsepower), standard, and heavy duty ratings. These motor units must be oper ated from a standard, single-phase, regulated power source with specifications as listed in Tables A and B. 1. 04 3 . PRINCIPLES OF OPERATION 3. The motor units that provide electromechanical rotating motion for operating varioos teletypewriter apparatus are of two basic types: synchronoos and series governed . Both types are self-contained motor units, with characteristics adaptable for use with standard power sources. 1.03 1 . SERIES GOVERNED MOTOR UNITS . 1 1. 02 . • The series governed type motor units (Figure 4) are available in standard and heavy duty horsepower ratings and may be oper ated from regulated or unregulated, standard, single-phase power sources, or de (direct cur rent). 'l'he series governed type motor unit is also available for operation with 48 volts de only. Specifications are given in Tables C, D, and E. 2. DESC IDPTION 2. 01 In general, the synchronous motor units consist of a motor and mounting arrange ment, and the required starting and protective devices. Variations of this type are described below. SYNCHRONOUS MOTOR UNIT S A. Miniature Synchronous Motor U nits ( Fig ure 1) 2. 02 1. GENERAL 1. 01 This section provides description and princiJ?les of operation for motor units. It is reissued to include additional information on synchronous, series governed , and series governed variable speed motor units. Since it is a general revision, marginal arrows that indicate changes and additions have been omitted. The 25 millihorsepower miniature synchronoos motor units consist of a two pole wound stator and two end shields that sup port a squirrel cage type rotor. The motor is secured to its bracket-type cradle by means of resilient mounts at each end, which tend to re duce the transmission of vibrations from the motor to the driven apparatus. A starting relay, capacitor and thermostatic cutout switch are mounted under the cradle. The thermostatic © 1965 and 1970 by Teletype Corporation All rights reserved Printed in U. S.A. Page 1 SECTION 570-220-100TC MOUNTING STR AP <;,: STARTING CAPACITOR S TA RTING R ELAY Figure 1 - Typical Miniature Synchronous Motor Unit cutout switch protects the m otor windings from excessive current drawn by the motor. be reset manually. It can the rotor within the end shields. ing the driving gear. starting capacitor, switch are mounted 2. 03 The variations of chronous include the miniature syn- 3600 rpm (60 hertz units) and 3000 rpm (50 hertz units) operation; The opposite end of the shaft contains a tapped hole for mount A motor starting relay, and motor mounting bracket. out switch, thermostatic in a compartment cutout of the The thermostatic cut which is reset manually, protects the motor winding from excessive current drawn an external fuse instead of the thermostatic cut by the motor. out switch; single or dual air ducts to improve ent mounts which are part of the end shields and ventilation, or an air shield to isolate the in which are held in place by straps attached to the coming cool air from the outgoing heated air; and mounting of control parts on the side of the motor instead of under the cradle. B. Standard and Heavy Duty Synchronous Motor mounting bracket. motor to the driven associated apparatus. 2. 05 motor units (Figure 2) consists of a two pole wound stator and two end shields that support a ball bearing rotor. Variations of the standard and heavy duty synchronous motor units include: rpm The standard and heavy duty synchronous The resilient mounts tend to reduce the transmission of vibration from the Units 2. 04 The motor is supported by resili units) (60 hertz units) and operation; 3600 3000 rpm (50 hertz 1/20 and 1/12 horsepower ratings; replacement of the fan with a gear to reverse the direction of rotation for such appli A combination handwheel and fan (new-style handwheel and fan is made of mounting for installation in the Wall plastic - Figure 3) is mounted on the motor Page Printer Set, shaft, and two fans are mounted at each end of control parts to meet varying installation re- Page 2 cations as the high speed punch unit; inverted Mounted for example; re-location of ISS 4, SECTION 57D-220-100TC STRAP RESILIENT MOUNT FAN HANDWHEEL (Old style) MOUNTING BRACKET RESET BUTTON START RELAY FOR THERMOSTATIC STARTING CAPACITOR THERMOSTATIC CUTOUT S WITCH CUTOUT SWITCH MOUNTING PLATE Figure 2 - Typical Standard or Heavy Duty Synchronous Motor Unit quirements as in the Multiple KSR and RO Set where the control parts are mounted in a com partment at the rear of the fan. Some standard a nd heavy duty synchronous motor units have the start relay and start capacitor held in position with springs by hooking the ends of the springs through the projections in the sides of the mount ing bracket. SERIES GOVERNED MOTOR UNITS (Figure 4) The series governed motor units typically consist of a motor, speed regulator (governor), protective and control devices, and a mounting. Variations of this type are de scribed below. 2.06 A. 1/20 Horsepower Motor Units (AC/DC and AC Only) 2. 07 The 1/20 hp series governed motor unit consists of a series type motor, speed governor, motor mounting bracket, and a hous ing for the governor resistors and spark sup pression capacitor. The governor is mounted on an extension of the armature shaft and includes a fan that circulates air through the motor. The opposite end of the shaft contains a tapped hole for mounting the driving gear. Targets for speed checking purposes are provided on the governor cover. The motor is mounted by means of resili- Page 3 SECTION 570-220-lOOTC MOTOR STRAP � � RESILIENT MOUNT !iii - IL� fjjCj"j;-;-��_,.;,,, ·:" / • PLASTIC FAN HANDWHEEL (New Style) START RELAY STARTING CAPACITOR RESET BUTTON THERMOSTATIC CUTOUT SWITCH FOR THERMOSTATIC CUTOUT SWITCH MOUN TING PLATE Figure 3 - Typical Standard or Heavy Duty Synchronous Motor Unit With New-Style Plastic Handwheel ent mounts at each end shield that are fastened to the mounting bracket by straps. The ac only motor unit is furnished with a bidirectional switch controlled governor. 2.08 A variation of the motor unit described in 2.07 is available with electrostatic shielding and radio frequency noise suppression. Page 4 B. 2. 09 / 1 20 Horsepower Motor Units Speed (AC DC and AC Only) / Variable These motor units are similar to the units described in 2.07 and 2.08 but have a gear arrangement permitting changing the motor speed manually while the motor is in operation. The ac only motor unit is furnished with a bi directional switch controlled governor. ISS 4, SECTION 570-220-100TC GOVERNOR MECHANISM GOVERNOR '1 ' COVER ELECTRIC NOISE SUPPRESSOR � GOVERNOR RESISTOR GOVERNOR CAPACITOR Figure 4 - Typical Series (Governed) Motor Unit C. 1/15 Horsepower Motor Units (AC/DC and The AC Only) for example, the requirements of the A utomatic higher horsepower rating accommodates, Send-Receive Set. D. 2. 10 1/15 Horsepower Motor Units (DC) These motor units are similar to the units described in 2. 07, but are equipped with electrostatic shielding and radio frequency noise suppression. T he ac only motor unit is furnished with a bidirectional switch controlled governor. 2. 11 These motor units are designed to oper ate with 48 volts de only and are equipped with electrostatic shielding and radio frequency noise suppression. Page 5 SECTION 570-220-lOOTC TABLE A TECHNICAL CHARACTERIST ICS OF MINIATURE SYNCHRONOUS MOTOR UN ITS CHARACTERISTICS LMU1 9, LMU20, LMU24, LMU26, LMU31, LMU45, MU43, LMU56 LMU35 25 Millihorsepower 25 Millihorsepower 115 .±10% AC 115 .±10% AC Single Single 60 hertz, .:;o. 7 5% 50 hertz, _:!:1% Running 5.0 1. 2 5 3.0 0.47 Power Factor 56% 89% 76 50 88-108 UF 64- 7 7 UF Rated Horsepower Input Voltage Phase Frequency Input Current (Full Load - Amperes) Starting (Full Load) Watts Input (Full Load) Start Capacitor Run Capacitor 7.0 UF Speed 3600 RPM 3000 RPM Rotation Clockwise viewed from pinion end Clockwise viewed from pinion end Mounting Upright Upright Contains no thermo Other L MU19 - Relay, capacitor, and LMU35 Distinguishing thermostatic cutout switch Characteristics mounted on motor bracket. static cutout device. Fused (0. 8A) externally. Relay and - capacitors mounted on motor LMU20, LMU26 - Relay, capaci mounting bracket. Equipped tor, and thermostatic cutout with a ventilator bracket and switch mounted on motor bracket. bidirectional switch. LMU20 has a ventilator bracket, LMU26 none. LMU24 - Twin exhaust ducts. Relay and capacitor mounted on motor bracket. No thermostatic cutout switch. Fused externally. Latest design have double shaft. LMU31 - Capacitor and thermo static cutout switch mounted on motor bracket. Relay mounted on bracket assembly. LMU45, MU43 -Relay, thermo static cutout switch mounted on motor bracket. Capacitor mounted on motor shield. Wiring for exter nal start switch noise suppressor (LMU45 only). LMU56 - Has double shaft. Similar to LMU24 except no v entilator brackets .... �b"- ;.J • "' ,..., """ ,-.,.. � ·� � TABLE B TECHNICAL CHARACTERISTICS OF STANDARD AND HEAVY DUTY SYNCHRONOUS MOTOR UNITS LMU3, LMU15, LMU21, LMU30, LMU37, LMU42, LMU33, LMU36, LMU38, LMU51, LMU52, LMU46, LMU49, YMU2, LMUll, LMU12 LMU50 CHARACTERISTICS YMU4 LMU55, YMU3 Rated Horsepower Input Voltage 115 ±10%, AC Phase Single 1/12 1/12 115 ±10%, AC 115 ±10%, AC Single Single 60 hertz, ..±<>· 75% 50 hertz, _±0.75% 60 hertz, ..±<>· 75% Input Current (Amperes) starting 9. O, (7. 0, YMU2) �.3, (4.3, LMU55), (8.0, YMU3 12.25 Running 1.85 2. 4, (1. 25, LMU55) 2. 8 14.5 2 .68 Power Factor (Full Load) 30% 35% 44.75% 34.4% Watts Input (Full Load) 65, (90, YMU2), (90, YMU4) 107, (105, LMU55) 132,9 148 50 70 70.6 62 Start Capacitor Rating 43-52 UF 43-62 UF (15-18 UF, LMU55) 170-226 UF 161-193 UF Speed 3600 RPM 3000 RPM 3600 RPM 3000 RPM LMU42 *CW, others *CCW viewed from fan or short shaft end. CCW viewed from fan or short shaft end. CCW viewed from fan end. CCW viewed from fan end. Mounting All upright except LMU30 which is inverted. All upright except LMU36 LMU11 - Inverted which is inverted. LMU12 - Upright Upright Other Distinguishing Characteristics LMU3 - Control parts in compartment under motor. Fan cooled. Thermostatic cutout switch. LMU33 - Similar to LMU3. No fan. Similar to LMU11 but with control parts in motor mounting cradle. Starting relay is voltage sensitive type mounted on bracket externally and attached to side of mounting cradle. Rotation ...:! 1/20 115 + 10%,AC (230 ± 10% AC, LMU55) Single Frequency Heat Dissipation (Watts) � 1/20 - *CW - Clockwise *CCW - Counterclockwise 50 hertz, +0. 75% LMU36 - Similar to LMU3 except for inverted mounting with control parts above motor. LMU11 - Control parts located above motor for inverted mounting. Fan cooled, Thermostatic cut out switch. ti.l t:ll ..� � C") � C1 ...:! ? I." I." cr � 0 0 1-3 C") ,', ___________________________________________________"'!!!!!!!"�"'!!!'!"!"."" '!'"'---�!!!!1�- TABLE B TECHNICAL CHARACTERISTICS OF STANDARD AND HEAVY DUTY SYNCHRONOUS MOTOR UN1TS (Continued) - LMU3, LMU15, LMU21, LMU30, LMU37, LMU42, LMU46, LMU49, CHARACTERISTICS LMU33, LMU36, LMU38, YMU2, YMU4 LMU51, LMU52, LMU55, YMU3 LMU15- Same as LMU3 except no fan. Pinion on short shaft end. LMU38 - Differs from LMU3 only in power frequency. LMU21 - Same as LMU3 except control parts at LMU51 - Similar to LMU3 except for more compact cradle and mounting arrangement. LMUll, LMU12 . ,., .." Other Distinguishing Characteristics (continued) rear of fan. LMU30- Same as LMU3 except for inverted mounting with control parts above motor. LMU37- Same as LMU3 except for cradle and mounting arrangement. Control parts on side o f motor. LMU42 - Same as LMU3 except cradle and mounting arrangement and control parts are in a bracket on side of motor and has CW rotation. LMU46 - Same as LMU3 except for external wiring for motor start relay arc suppressor. LMU49 - Same as LMU3 but with speed sensing device. Fan reversed (solid side adjacent to end bell). LMU52 - Similar to LMU3 except control parts mounted at rear of fan. LMU55 - Similar to LMU3 except has 230v input. YMU3 - Same as YM U2 except thermostatic cutout switch for 50hertz. LMU12 - Same as LMUll but with control parts located in motor mounting cradle and end shields rotated 180° for upright mounting. LMU50 r f'· � ·""" � .�' ·� TABLE B TECHNICAL CHARACTERISTICS OF STANDARD AND HEAVY DUTY SYNCHRONOUS MOTOR UNITS (Continued) CHARACTERISTICS Other Distinguishing Characteristics (continued) LMU3, LMU15, LMU21, LMU30, LMU37, LMU42, LMU33, LMU36, LMU38, LMU46, LMU49, LMU51, LMU52, LMU55, YMU2, YMU4 YMU3 LMUll, LMU12 LMU50 YMU2 - Similar to LMU3 except has control parts mounted at rear of fan. Has suppressor network. YMU4- Similar to LMU3 except network assembly mounted on side of mounting bracket. rn 00 � " gj n d � U'1 .... <? N N i cc <? """" � SECTION 570-220-100TC TABLE C TECHNICAL CHARACTERISTICS OF SERIES GOVERNED MOTOR UNITS FOR LMU6, 13, 28, 29, 39, 41 ,, -� ' LMU6, LMU28, LMU 41 LMU13, LMU39 LMU29 1/20 1/15 1/15 115 .±10%, AC/DC 115 .±10%, AC/DC 48 .±10%, DC Single Single - 25, 50, or 60 hertz, or DC 25, 50, or 60 hertz, or DC - CHAR ACTER ISTICS Rated Horsepower Input Voltage Phase F requency Input Current {Full Load - Amperes) Starting Hertz 60 25 - 50 - 2.4 2.7 1.9 Hertz 60 - DC - 4.0 2.8 3.4 13 2.3 1.8 1.7 2.5 DC - 25 - 50 - 1.8 4.5 Running 1.18 1.34 1.12 0.93 2.1 Power Input (Watts) 123 114 92 1.07 235 200 190 195 120 Power Factor (Full Load) 90% 74 % 71% - 96.8% 87% 79% - - Heat Dissipation (Watts) 86 87 55 70 130 97.2 94.2 111 66 25 - - 50 12 - - 20 - S eries R esistor (Ohms) T a rg et Indicator 4, 6, and 35 Spot 4, 6, and 35 Spot 4, 6, and 35 Spot Governed Speed 3600 RPM 3600 RPM 3600 RPM Rotation CCW viewed from commutator end CCW viewed from commutator end CCW viewed from governor end Mounting U pright LMU13 - Inverted LMU29 - Upright , <, ___ ) ) LMU39 - Upright . ) ' ,,�-\: RF Shielding LMU28, LMU41 LMU39 LMU29 RF Suppression LMU28, LMU41 LMU39 LMU29 C ontrol parts compartment rectangular on LMU6, LMU28, LMU39 governor resistor mounted on a heat sink in stepped compartment. LMU13 No screened governor cover on LMU2 9 with stepped com- cradle compartment partment. Other Distinguishing Characteristics and LMU41 governor resistor mounted on heat sink in stepped compartment. ---- f'c;�.�t .iV ----�- ,__ is rectangular. ---- ,_,� '��� J � ; �- ISS 4, SECTION 570-220-100TC ( '" ( TABLE D TECHNICAL CHARACTERISTICS OF SERIES GOVERNED MOTOR UNITS FOR LMU57, 61, 63, 64, YMU5 CHARACTERISTICS ' LMU61, YMU5 LMU57, LMU63, LMU64 1/15 1/20 - Rated Horsepower Input Voltage 115 _::10%, AC only Phase ( ( (, Single Single 25, 50, 60 hertz Input Current (Full Load Amperes) 25 Hertz 50 60 25 Hertz 50 60 Starting 4.5 5.0 3.8 2.8 3.1 2.2 Running 2.5 2.3 2.4 1.2 1.3 1.2 Power Input (Watts) 135 130 133 82 61 63 Power Factor (Full Load) 45% 48% 54% 67% 43% 52% H eat Dissipation ( Watts ) 72 72 75 53 34 36 Series Resistor (Ohms ) 12 25 Target Indicator 4, 6, and 35 spot 4, 6, and 35 spot Governor Speed 3600 RPM 3600 RPM Rotation CCW viewed from com mutator end CCW viewed from com mutator end Mounting Upright Upright LMU61, YMU5 Motor Only LMU63, LMU64 LMU61 LMU63, LMU64 RF Suppression Other Distinguishing Characteristics (fi 115 _::10%, AC only Frequency RF Shielding ( -- LMU61 control parts mounted within end shield. Has bidirectional switch. YMU5 control parts mounted within end shield. Has bidirectional switch. 25, 50, 60 hertz LMU57, LMU63, and LMU64 have control parts mounted within end shield. LMU63 noise suppressor mounted in square con tainer. LMU64 noise suppressor mounted in rectangular container. LMU57, 63, and 64 have bidirectional switch. Page 11 S E CTI O N 570-220-100TC 0'') TABLE E TE CHNICAL CHARACTERISTICS O F SERIES GOVERNED MOTOR UN ITS FOR LMU47, 60 LMU47 Uv1U60 1/20 1/20 115 �10%, AC/DC 115 �10% , AC only Single Single 25, 50, 60 hertz, DC 25, 50, 60 hertz CHARACTERISTICS Rated Horsepower ) '" Input Voltage Phase Frequency Hertz Inpu t Current (Full Load Amperes) 25 Hertz 60 50 DC 25 50 ) 60 ' Starting 2.4 2.7 1.9 1.8 2.4 2.8 2.1 Running 1.18 1.34 1.12 0.93 1.2 1.3 1.2 123 114 92 107 70 70 65 (Full Load) 90% 74% 71 % - 90% 74% 71 % Heat Dissipation (Watts) 86 87 55 70 86 87 55 Series Resistor (Ohms) 25 50 25 Power Input (Watts) Power Factor I - - - - ) Target Indicator - Governor Speed 3600 RPM 3600 RPM CCW viewed from com- CCW viewed from commutator end Rotation mutator end Mounting Upright Upright RF Shielding LMU47 LMU60 RF Suppression LMU47 LMU60 Variable speed control Variable speed control parts mounted in stepped parts mounted within end shield. Noise suppressor Other Distinguishing Characteristic s compartment. , ,) mounted in rectangular cradle compartment. bidirectional switch. i Has I � Pa�e 12 - ----�--- ,j �� ISS 4, ( ( 3. PRINCIPLES OF OPERATION determined magnitude, energizes. the starting winding from the operating circuit. The and 5) rotor continues to accelerate until it reaches the synchronous operating speed. Rotation is in The following description of operation applies to the miniaturized, standard, the counterclockwise direction, as viewed from the fan or short-sha ft end of the motor. and heavy duty synchronous motor units. 3.02 The stator of the synchronous motor h as two windings: a starting winding and an operating (or run) winding. The starting wind ing, starting capacitor and the normally-open contacts of the starting relay are connected in ( the starting relay de Its contacts open and remove SYNCHRONOUS MOTOR UNITS (Figures 1� 2, 3.01 ' ' SECTION 57G-220-100TC series. The coil of the current-operated start ing relay is connected in series with the oper ating winding. When power is applied, the ini tial current through the operating winding (and 3 .03 The thermostatic cutout switch is con- ings. This temperature operated device opens nected in series with both stator wind the circuit to these windings whenever exces sive current is drawn, such as may occur if the motor is stalled, thereby preventing overheating and damage to the motor and control parts. The switch may be reset after the unit has cooled by depressing a pushbutton. also the starting relay coil) energizes the relay, and its contacts close the circuit to the starting 3. 04 In some motor units a suppression net As the speed of the rotor increases, work is wired in parallel with the starting the current in the operating winding decreases and, when the current has decreased to a pre- winding to suppress arcing of the relay contacts winding. (Figure 5). SUPPRESSIO N ( NETWORK -- OPERATING WINDING - r- ,11 ( I I' L STARTING WINDING I' J ----+-STARTING C APACITOR I I I L __ ,---t-'V'./tl=:�-THERMOSTATIC CUTOUT SWITC H (, ( 115 VAC 60 Figure 5- Typical Synchronous Motor Unit Schematic Diagram Page 13 SECTION 570-220-lOOTC The 3. 05 following description of operation applies to synchronous motors with a bi As the applying power to the start capacitor. speed of the rotor increases, current through the operating winding decreases and, when the directional switch (Figure 6 ). ·� current has decreased to a predetermined magni tude, the starting relay de-energizes. 3. 06 The stator of the synchronous motor has a starting winding and an two windings: operating (or run) winding. When power is ap plied to the motor terminals, the initial current through the relay coil, in series with the oper ating (or run) winding, energizes the relay. Its tacts then open, breaking the The con flow of current supplied to the gate of the bidirectional switch, and disconnect the starting winding and start .�) capacitor from the line. The rotor continues to accelerate until it reaches the synchronous oper ating speed. Rotation is in the counterclockwise contacts close applyiJ g current to the gate of the direction, as viewed from the leads end of the bidirectional switch through a resistor, thus motor. /) OPERATING WINDING MOTOR START RELAY BIDIRECTIONAL \ SWITCH .-\· / ROTOR � ) \ r _j_ l;' ·:n1 RUNNING CAPACITOR ( I · 1'..1 I . a STARTING WINDING / .) STARTING CAPACT'T'•'·"' 115 V AC /' :3.ESISTOR MOTOR START RELAY CONTACTS F .gure 6 - Typical Synchronous Motor Unit Schematic Diagram With Bidirectional Switch Page li .J ,J ISS 4, S E C TIO N 570-220-100TC (, ' 3. 07 governed The contact is held closed under the tension of a spring which is adjusted to maintain this con 3. 08 The series wound motor utilizes an elec- With the contact closed, the resistors are short ed out. When the speed of the motor exceeds the predetermined rate, the centrifugal force The following description of operation is applicable ' 3 and 7. to ac/dc series motor units Figures ( resistor (high-wattage) and capacitor are con nected in parallel with the governor contact. SERIES GOVERNED MOTOR UNITS dition during speeds up to a predetermined rate. acting upon the contact momentarily overcomes tro-mechanical governor for speed reg ulation. The governor regulates the speed at rpm, .± 1 percent, by alternately increasing and decreasing the current in the series con 6 3 00 the spring tension and the contact is opened. This removes the short from the resistors and nected field windings and armature, which are also in series with a governor contact. A ings and armature, reducing their current, 'and consequently reducing the speed of the motor. ( ' they then appear in series with the field wind ELECTRICAL NOISE SUPPRESSION CAPACITORS GOVERNOR BRUSHES� CONTACT FOR GOVERNOR CONTACT SCREW r -------- ------------\. /. 1 ' ARMATURE ! ( ,' - '\ l ---UF - o.O � I I I I I A \ SERIES FIELD ARMATURE - ;. , L---JI---�----- - -WINDINGS - ( �l � I ( _ LINE (, __ -3 i- 3 o Uii T -·0.35 A .n 0.�25 � UF � 0.25 UF : L 0.35 n 1 L _!3�UH -=- __ � _L :.---, l l - ---- -- - 250.1'\. I I �� 0.5 t-::L_ � I- I y CENTRIFU GAL GOVERNOR MECHANISM ELECTROSTATIC SHIELD 1 SERIES RESISTANCE FOR GOVERNOR I CffiCUIT I _ BRUSHES UF 1 I \L _1: -- - '_1 -__ 1 -- 1 --- I I 'GOVERNOR -=- BRUSHES I \� _ _ _ _ _ ELECTRICAL NOISE SUPPRESSOR Figure 7 - Typical AC/DC Series Governed _ ...J ~ SPARK SUPPRESSION CAPACITOR FOR GOVERNOR CffiCUIT ELECTROSTATICALLY SHIELDED COMPARTMENT Motor Unit Schematic Diagram Page 15 SECTION 570-220-100TC 3 09 • black spots equally spaced about its periphery. The tension on the contact spring is ad- The outer, center, and inner rows contain four, justable to maintain the motor speed at 3600 rpm. To make this adjustment, a target is six, and thirty-five spots, provided to compare the motor speed with a standard. The outside surface of the governor four spot row is a target which should remain essentially stable at 3600 rpm, when viewed through the moving shutter of a 120 vibrations cover is finished in white with three rows of � GOVERNOR CONTACT �--I'"YY';y''VY'\.\ '\ ARMATURE I e The � WINDINGS ) .... . GOVERNOR CONTACTSCREW /. ,'- - \o.o:luF-------\ (( 1J. A). e lf-:L_ , "'·) GOVERNOR BRUSHES SERIES FIELD . . ELECTRICAL NOISE SUPPUESSION CAPACITORS FOR BRUSHES respectively. �"-."-> CENTRIFUGAL ARMATURE BRUSHES GOVERNOR MECHANISM BIDIRECTIONAL SWITCH 330 UH 47011.. 0.11 UF SUPPR ESSION NETWORK LINE , ) .. \ '�rJ ELECTRICAL NOISE SUPPRESSOR . Figure 8 - Typical AC Only Governed With B idirectional Switch P age 16 Motor Unit Schematic Diagram J. 1, ISS 4, SECTION 570-220-100T C ( ' ( ' per-second tuning fork. The six spot and thirty five spot rows serve as targets when using an 87 . 5 vibration-per-second tuning fork. The six spot row is used to approach an on-speed set ting and the thirty-five spot row is used to ar rive at an accurate setting of 3600 rpm. ( MOTOR UNITS VARIA 3.12 The variable speed motor units are not equipped with governor control linkage, tachometer, or gears. The parts are supplied in modification kit TP173518. 3. 10 The following description of operation is applicable to ac series governed motor units furnished with a bidirectional switch (Fig ure 8). 3.11 ( SERIES GOVERNED BLE SPEED The series wound motor utilizes an electromechanical governor for speed regu lation. The governor regulates the speed 3600 rpm +1 percent by alternately increasing and decreasing the curre�t in the series connected field windings and armature, which are also in series with a bidirectional switch controlled by the governor contacts. Normally the governor contact spring holds the governor contact against the contact screw. When the speed of the motor exceeds a predetermined rate, the centrifugal force developed on the governor contact over comes the pull of the governor spring, and the governor contact opens, removing the trigger of the bidirectional switch, and therefore, decreas ing the speed of the motor. The switch will then go into and remain in the blocking or non conducting state when the alternating current crosses the zero reference point. Therefore, no power is applied to the motor until such time that the contacts again close and gate triggers the switch back into the conducting state. This will occur for either polarity of applied voltage. For motor speed adjustments see 3. 09. 3. 13 The variable speed motor has a range of 1800 to 4150 rpm and can be adjusted to within +1 percent of a specific speed while the motor Is running. In this externally controlled governor, the adjusting screw is turned by a gear train actuated by the rotation of the motor. The gear train at its driven end is divided into two branches with an odd number of gears (three) in one branch and an even number of gears (four) in the other. This provides for turning the ad justing screw in either direction to increase or decrease the tension of the governor spring. The pinion of each branch of the gear train is located on the same center as the motor shaft. The pinions are part of the brake disc assembly; an assembly which is free to idle on the stud to which it is mounted. When the speed is not being changed the gears do not rotate but merely revolve with the governor on which they are mounted. However, if a brake shoe is moved against either brake disc, by operating the lever SLOW or FAST that brake disc and its associated pinion turn the spring tension and adjusting screw. Changing of the spring tension causes the motor speed to change. For governor oper ation for ac/dc motor units refer to 3. 08. For motor units operating on ac (with bidirectional switch) refer to 3. 09. ( (, ( Page 17 17 Pages TELETYPE CORPORATION Skokie, illinois, U.S.A. ( SECTION 570- 220- 700TC Issue 5, November 1970 MOTORS AND MOTOR U NITS ' REQUIREM ENTS AND ADJUSTMENTS (' PAGE CONTENTS 1. GENERAL . . . • . . . . . . . . . . . . . . . . . . 1 . Motor positioning Motor shield 2. ( REQUIREMENTS AND ADJUST MENTS- OTHER THAN 28, 35, 2 Common Requirement ......... 2 . . . . . . . . . . . . . . . . ( . . . . . . . . . . . . . . . stop plate ................. . 9 • 14 . . . . . • . . . . . . . . . . . . • . . . . . . . . . . . . . Motor bearings Motor brush Motor-brush spring ........ . • . . . . . . . . . . . • • • • • • • • • • • • • Refacing motor brush ...... • 18 19 . . . . • . . . . . . • . 22 21 Motor positioning . • . • . .. 21 Governor brush spring . . . . . . Governor contact 24 . . . . • . . • . . . • . . . . . • . . • . 23 23 23 24 . 7 5 5 . . . . , . . • . / ... 25 Plastic Type Axial Fan for Models 28 and 35 Teletypewriter Sets 6 . . Speed control linkage bearing plate . 6 6 . • 28 Cable clamp interference on G. E. motor Three-brush starting switch . 3. . • . . . . . . . . . . . (O ld-style on H.C. motor) • • . . 3 4 MOTOR UNITS . . . . . . • . . . . 1. GE NERAL 1.01 REQUIREMENTS AND ADJUST • This section contains the requirements and adjustments for motors and motor · MENTS- 28, 35, AND 37 TYPE . .. 18 Miniaturized Synchronous units used with various teletypewriters and as sociated apparatus. This section and the section covering general teletypewriter requirements and adjustments provide the information neces Motor Units sary for maintenance of motors and motor units. 20 It is reissued to change the title and to include .. 20 Motor gear . . . . . . . . . . . . . . 18 the requirements and adjustme nts for the 14, 15, 19, and 20 type motor units, variable speed Air ducts . • . . • . . ... .. . . . Capacitor position ( • . Three-brush starting switch ( " • . Motor Units Synchronous Motors ( . . Brake shoe slide ....... 25 Governor spur gear train . . . 26,27 . o . • Series Governed Variable Speed 8 . • o . . 7 . . . • . . . . • . . Cleaning brush and brush . . • Governor contact backstop . . . . Motor positioning ..... Motor speed ........ Governed Motors holder Commutator . . Motor adjusting stud . . Governors Governor contacts .......... Speed -adjusting-lever . 8 . Governors ................. Edge -contacting-type . . Series Governed Motor Units washer (single-speed . . Centrifugal switch Adjusting-wheel friction . . Synchronous Motor Units Governors • . Standard and Heavy Duty A ND 37 TYPE MOTOR UNITS . . . . . governor) Center-contacting-type PAGE CONTENTS . . . . . • . © 1964 and 1965 by Teletype Corporation All rig hts reserved P rinted in U.S. A. Page 1 SECTION 570-220-700TC switch, series governed motor units, centr ifugal a general this Since fan. axial type c plasti and marginal arrows used to indicate revis ion, . c hange s and additions have been o mitted Also included in this section are the requirements and adjusting procedures and for the maintenance of motors, motor units, 1. 02 governo rs used with 28, 35, and 37 teletypewriter apparatus. The figures in this section show the ad- 1. 04 positions of justing tolerances, parts, and spring tensions. moving For requirements , and procedures for adjusting the relationship between the motor pinion and the gear, refer to the particular section for the type of apparatus involved. CAUTION: THE EL ECTRJC POWER SHALL BEFORE �DISCONNECTED PARATUS IS REMOVED FROM TECTIVE HOUSING. OF WHERE APPARATUS THE !, THE AP ITS PRO OPERATION AFTER ITS RE IS REQUIRED, APPLIED WITH AP MOVAL FROM THE HOUSING 1. 03 Routine maintenance of a motor unit is ordinarily confined to wiping oil, grease, and dust from its exterior portions. If it be comes necessary to dismantle the motor unit, consideration should be given to substituting a new motor, since motor repair and maintenance can be done more efficiently in a repair shop than on the subscriber's premises. POWER SH ALL BE PROPRJATE PRECAUTIONARY MEASURES TAKEN TO PREVENT ACCIDENT. 1. 05 ) ' :,·,,>� The cleaning materials specified in this section are those listed in the section covering the general requirements for cleaning teletypewriter apparatus. STATOR FRAME STATOR ) THRUST SPRING ����nT1� ----� 7POUNDS '• ) FELT WASHER -THRUST SPRING WASHER BALL BEARING PINION END SHIELD F igure 1 P age 2 - R otor T hrust Spring Tension . ' ')1. �<""' ISS 5, SECTION 570-220-700TC ( ' ( 2. REQUIREMENTS AND ADJUSTMENTS - the rotor shaft and apply the pressure in line OTHER THAN 28, 35, AND 37 TYPE MOTOR UNITS with the shaft. 2.01 Common Requirement - Rotor Thrustspring Tension: It shall require at least 7 pounds to push the shaft endwise. Upon re leasing the tension, the shaft should return to its normal position. (See Figure 1.) (b) If springs do not meet this requirement, remove the pinion end shield and clean the bearing housing. If necessary, replace the spring. Reassemble the end shield. 2. 02 All General Electric motors have Note: thrust springs, but some Holtzer-Cabot mo tors do not. Synchronous Motors: These requirements need not be Note: checked unless there is reason to believe the starting switch is causing trouble or the motor is disassembled for other reasons. ( (a) To gauge, remove the motor from the teletypewriter and place the push end of the 15 pound scale against the switch end of (a) Three-brush Starting Switch on G. E. Motor (See Figure 2): To disassemble, LOCKING KEY S WITCH COMMUTATOR SPRING WASHER BRACKET BRUSH HOLDER STUD INSULATOR 11�!>\ ( i':::H: :: l STOP PIN -II�! ! ! .' MIN 0. 020 11:-.i.<! ! INCH ! FIBER DISC ( ROTOR BRUSH HOLDER CENTRIFUGAL SWITCH SPRING STARTING SWITCH COMMUTATOR l ,, ROTOR SHAFT - SWITCH END ( " Figure 2 - Three-brush starting Switch on G.E. Motor Page 3 SEC TION 570-220-700TC detach motor from its associated apparatus, nately, a little at a time, until both are tight. and remove pinion, motor fan (if provided), and the end shield on the starting-switch end Fasten the end shield to the motor frame tightening the screws in the same manner of Pull the motor. out the rotor until the starting switch is easily accessible. Unhook and remove the centrifugal-switch spring. as above. (b) Three-brush Starting Switch ( Old-style) on H.C. Motor (See Figure 3): (1) Brush holders shall be mounted by To dis assemble, detach motor from its associated their center mounting holes with their apparatus, and remove pinion and motor fan spring washers and locking keys securely in place, and shall be free from bind. Remove the starting-switch (if provided). split-ring screws, the end-shield screws, the Brush-holder stop pins shall be safely bearing retainer screws, and the end shield. Remove the bearing-retainer screws from (2) within the elongated holes of the fiber the pinion end shield of the motor and pull out disc on which the brush holders are mounted (minimum 0 020 inch), when all the play has been taken up to reduce the engagement the rotor until the starting-switch is easily 0 to a minimum. (3) Gauge by eye. Centrifugal-switch Spring Tension: It shall require minimum 1-3/4 ounce, maximum 2 ounces for 50 hertz motors, minimum 2 ounces, maximum 2-1/2 ounces for 60 hertz motors to extend the spring to a length of 5 inches. (4) The fiber mounting disc shall be se- curely fastened to the metal sleeve that secures the assembly to the rotor shaft. Loosening of the fiber disc on the metal sleeve may cause failure of the brushes to disengage from the commutator. (5) The starting-switch commutator shall be free from excessive burns or pits and its wires securely soldered in place and in good condition. To Adjust: If the commutator is burned or pitted, remove the rotor bearing, unsolder the wires attached to the commutator,and slip the commutator from the rotor shaft. Wrap a piece of 400A Aloxite around the commutator and rotate back and forth until the burned spots or pits are removed. If the burns or pits are too deep, discard the commutator. Before reassembling, make sure that the gaps between the segments of the commutator are free from metal parti cles and dirt. (6) To reassemble, replace the centrifugal- (1) Brush-arm Spring Tension: shaft and fasten the switch commutator to the end shield, tightening the screws alter- ·� .) It shall require minimum 5 ounces, maximum 8 ounces, to just pull the brush arm against its stop when the brushes are resting on the commutator (split ring) and the rotor is held so that the spring being checked is in a hor izontal position. Repeat check for each brush-arm spring. (2) Brush arms shall be free and without bind, the retaining washers in place, and the end of the brush-arm mountin g post safely riveted to secure the retaining washer If retaining vrashers are missing or the mounting post is not safely flattened, ) 0 do not attempt to flatten the mounting post but replace the assembly� (3) The starting-switch split ring shall be free from excessive pits