Document JJmkZ0vZbNX2zgyYjbevZgmYe

May, 1943 puuwrm -S5Wfc SD-100 SQUARE J} COMPANY INDUSTRIAL CONTROLLER DIVISION MILWAUKEE. WISCONSIN. U.S. R. Service Instructions MAINTENANCE UflQ BULLETIN_________MZO Caution! Always be sure that the controller is completely disconnected from the power source before attempting any maintenance or servicing of the controller. Servicing -- The controller should be inspected before installation and at regular intervals there after. Do not wait for trouble to develop before in specting. At the time of initial inspection and installation, care should be taken that no diagrams, instruction sheets, etc. are removed from the en closure and destroyed. All controllers are adjusted and tested for perfect operation before they leave the factory and only minor adjustments, if any, should be necessary before the controller may be put in service. However, some damage may have occurred during transit and it is, therefore, best to see that all devices operate freely without binding before the controller is connected to the source of power. The controller should be cleaned regularly by using a stream of compressed air or a blower. The collection of abrasive dust on moving parts may shorten the life of those parts by causing excessive wear. The magnet surfaces should be kept clean at all times so that they may seal properly. If the magnet surfaces become sticky, the contacts may remain closed after deenergization of the device. If the magnet surfaces do not close properly, the device may also fail to close its contacts. Do not oil any parts of the controller except the disconnect switch, which may need occa sional lubrication to insure ease of operation. All contactor bearing surfaces are designed for a maximum life with no lubrication necessary for satisfactory operation. Oily surfaces become the collectors of dust and eventually cause an accumu lation, which may result in faulty operation of the device. Before dismantling any device for servicing, it is wise to note the positions of all nuts, screws, springs, pins, etc. since the positions of these items are the approximate positions which will insure proper operation of the device. It is also wise to check the voltage being applied to the device and at the same time make sure that the device "picks up" and seals without hesitation. The proper aligning of all moving parts will afford smoother operation and longer life for the parts themselves. An investigation should also be made to make sure that the insulation has not been broken down by vibration, flashing, or some other abnormal condition. All permanent connections should be tight. Overheating will develop rather quickly if any loose connections are present. Excessive heating or flashing should be investigated carefully since the cause is probably an overloaded circuit. An ammeter placed in the circuit will quickly indicate whether or not an overload is present. Contact Surfaces--Neither the silver nor copper contact tips should be dressed unless they have become burned and very rough. Particular care should be taken to avoid dressing the silver con tact tips for two reasons. First, the silver tip is designed for a minimum thickness and the wasting of too much contact material shortens the contact tip life materially. Secondly, the silver contact tip may become oxidized and its appearance would indicate that a good contact could not be made, but actually the oxidizing has little effect on the contact made. All contact tips should be replaced only when tips have worn thin, but should be re placed before being worn to the point that over heating will develop. Overload, evidenced by excessive heating and arcing at the tips, is one of the more common factors contributing to a short contact tip life and should be eliminated as quickly as possible. When it is time to replace contact tips, it is generally advisable to replace all tips at one time since the contactor may be more easily ad justed and, also, to insure more satisfactory opera tion ' of the device. If the contact finger spring pressure is not great enough to give proper follow up after contact has been made, it may be wise to replace the finger spring since the spring may have become weakened by overheating or flashing. All contact surfaces should be kept clean and free from any film of dust, oil or other coating of foreign matter. If these surfaces are not kept clean, the film will act as an insulator and poor contact will result. External Conditions -- Of course, the controller as well as the individual devices should be pro tected from external conditions such as weather, vibration, abuse, overvoltage, overload, etc. The elimination of any difficulties of this nature will tend to provide more satisfactory operation and a longer troublefree life of the device. SC-SDC-0300 August;, 1942 SQUARE I] COMPANY INDUSTRIAL CONTROLLER DIVISION MILWRUKEE. WISCONSIN. Li. S. R. SPAKE PARTS FOR 50 AMPERE OVERLOAD RELAX M 4MAINTENANCE BULLETIN Item Ho. Description Part No. Itam No. Description Part No. 1 Beset Slider Assembly 2 Guide Pin 3 Tie Bar and Stop 4 Latoh Spring 5 Spacer Plate 6 Stationary Contact 7 Movable Contact 1139-M4-G1 1151-X7 1151-X9 1025-X3 1151-XS 1151-G3 1151-G1 8 Oontaot Finger Spring 9 Terminal Post 10 Brass Stud 11 Brass Stud 12 Thermal Unit 1151-X12 749-XS9 297-3-X15 297-D3-X8 Speoify rating Stamped an Relay or Give Full Load Current of Motor MATOTRgANf.E INSTRUCTIONS OVERLOAD BELAY - To remove and inspeot the overload relay. Item 12, it is nooecsary only to remove the tiro maohine screws whioh hold the relay to the terminal post. Item 9, and the relay can then be slipped off the mounting studs. Item 10. When the relays are tripped due to an overload, the relays nay be manually reset after aliening a few moments for oooling. No replacement of parts is needed, and no deterioration follows repeated tripping. T.ATnff SPRING - To replaoe the latoh spring, Item 4, first remove the overload relay as above and loosen the sorems holding the tie bar and stop. Item 3. The reset slider assembly. Item 1, together with the tie bar and etop may then he removed from the panel where the latoh spring may he easily removed from the slider assembly and the tie bar. CONTACT FINGER AND SPRING To replace the movable oontaot. Item 7, and oontaot finger spring. Item 8, remove the reset slider as above. Upon removing the oottor pin holding the contact finger spring in plnoe, these item3 are free for inspection. STATIONARY CONTACT - To remove the stationary oontaots. Item 6, the relay should be tripped by moving the slider latoh away from the ratohet wheel on the overload relay. Remove the hexagonal nut holding the stationary oontaot and unsorew the brass stud. Item 11, from the rear of the panel. The stationary oontaots will then he free for inspection. -o - o - ORDERING INSTRUCTIONS " Specify quantity, part number and description of part, giving oomplete nameplate data of the devioe. For example, one ^1025-X3 latoh spring for overload relay used on Class 7904-TL-2, bearing serial number 21B4-S11-B10,S6S34S. March, 1944 SQUHRE J3 COMPANY INDUSTRIAL CONTROLLER DIVISION MILWAUKEE. WISCONSIN. U.S.A. MAINTENANCE \AA A BULLETIN_________IV144 TRIP CHARACTERISTICS OF MELTING ALLOY TYPE THERMAL OVERLOAD RELAY TRIP CHARACTERISTICS OF MELTING ALLOY TYPE THERMAL OVERLOAD RELAY Type : Service C Reset : Manual Reset Time . : Wait one minute before resetting relay Range of Adjustment: Uon-adjustable April, 1943 LL V SQUARE ] CDMPRNY INDUSTRIAL CONTROLLER DIVISION MSLWOUKEE. WISCONSIN. U.S.H. MAINTENANCE Ui BULLETIN (V\20 D. C. Magnetic Relay 15 Ampere -- Single Pole with Blowout DD EE F Xz cc photo Identify cation. Description Part Number A 147S-X17 B Round Head Iron Machine Screw. 6-32 x W c- Lock Washer...................................... PM20-6 D Coil Terminal Clamp....................... 281-D18-X2 E Magnet Coil (115 Volts)................. 147S-S1-W3 E Magnet Coil Volts).................. 147S-S1-W37 F Blowout Coil Assembly................... 1931-D5-G1 G hound Head Iron Machine Screw. 8-32x5/16" H Lock Washer...................................... PM20-8 J Contact Tip Assembly..................... 1931-G4 K Pole Face............................................. 147S-X15 L Round Iron Machine Screw........... 8-32x ys" M Contact Finger Assembly (Lead on Left Side)........................................ 1931-G7 M Contact Finger Assembly (Lead on hight Side)...................................... 1931-G8 N Finger Spring Cup Washer............ 306-D1-X9 O Finger Spring Cotter Pin................ 1/16v x W P Finger Spring..................................... 1323-X3 Q Tail Spring........................................ . 374-D10-X1 R Tail Spring Cotter Pin..................... 5/64vx H" S Tail Spring Post................................. 147S-X49 T Tail Spring Cup Washer................. 306-D1-X1 U Round Head Iron Machine Screw. 6-32 x H1' V Interlock Support.............................. 147S-X30 w Armature Lever Assembly.............. 1931-D35-G1 X Interlock Bar Assembly................... 147S-G9 Y Terminal Post Cup Washer............ 306-D2-X1 z Interlock Contact Finger Guard... 1855-X21 AA interlock Contact Finger Assembly 1855-G2 BB Cap Nut............................................... 214-X24 CC Interlock Finger Support................. 147S-X19 DD Terminal Post..................................... 1931-X12 EE Terminal Screw.................................. 214-X4 FF Magnet Frame Assembly................. 147S-G1 GG Iron Stud............................................. 8-32 x 2" HH Hexagon Iron Nut............................. PM21-8-32 JJ Iron Washer....................................... 1W8A KK Magnet Core...................................... 1475-X16 LL Arc Shield Assembly....................... 1931-D21-G1 MAINTENANCE INSTRUCTIONS Contact Tip* -- All contacts are silver and are not harmed by discoloration and slight pitting. DO NOT FILE THEM as dressing wastes contact material. Replacement is necessary only when silver has worn thin. To change stationary contact J remove arc shield assembly LL and round head iron machine screw G. To change movable contact finger assembly M, release the flexible lead from terminal post DD and remove cotter pin O, cup washer N, and finger spring P. Armature Assembly -- To remove armature assembly W release flexible lead of movable contact finger M from terminal post DD and remove cotter pin R, cup washer T and tail spring Q. The armature fever assembly can then be lifted free of the contactor. Magnet Coil -- To remove magnet coil E remove armature assembly W as described above. Then disconnect coil leads and re move screw L holding pole face K to magnet core KK. The coil will then slide off of the magnet core. Ordering Instructions -- Specify quantity, part number, and description of part giving complete nameplate data of device. For example 2--1931-G4 contact tip assemblies for undervolfage relay used on Class 7906 Type U02 controller with serial number 2275-S1-A10, 893101. & M APP*?USvED SQUARE n COMPR NY INDI 'rm*L C `SUL* . 1 s . KC( WIS s * OUTLINE DIMENSION DRAWfNG OF MARINE TYPE DRIP PROOP CABINET 1 (WALL MTG.) 2184- E42. TTH $Oi 7OOZ mi XL* 7 f#4 >* T 2-24-44 -r RjO. 2I84-D61