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Auxiliary Contacts
Assembly Instructions

TM-5-3895-374-24-1 Paving Machine Bituminous Material: Crawler Mounted Diesel Engine Driven Manual
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TM 5-3895-374-24-1 Bulletin No.  30072-013-01 January, 1992 Overload Relays ? Terminals ? Inspecting and Replacing Contacts Manual Operation Coil Replacement Table 1 Field Modification Kits Kit Class 9999 Type Factory Modifications (Form) Push button, start-stop SA2 A Push button, on-off SA10 A3 Selector switch, hand-off-auto SC2 C Selector switch.  on-off SC22 C6 Red pilot light (slip-on enclosure) SP4R P1 Red pilot light (hinged door enclosure) SP14R P1 A  melting  alloy  overload  relay  is  supplied  as  standard  with  provisions  for  one  or  three thermal units.  The contact unit (item 7) of the melting alloy overload relay is available with a normally-open   or   normally-closed   isolated   alarm   contact   in   addition   to   the   standard normally-closed contact.  The contact unit with alarm circuit contacts can be installed in the field (refer to Table 5). Non-temperature   compensated   bimetallic   overload   relays   are   available   as   an   optional feature (Form B5).  Ambient-temperature compensated bimetallic overload relays are also available as an optional feature (Form Y59).  Bimetallic overload relays have provisions for one or three thermal units. These overload relays are not designed for field repair and should not be disassembled. Use copper wire only on standard device power and control terminals.  Box lugs are suitable for  wire  sizes  #14-1/0  kcmil.    Pressure  ,wire  control  terminals  are  suitable  for  wire  sizes #16-12, solid or stranded. Contacts  are  not  harmed  by  discoloration  and  slight  pitting.    Do  not  file  contacts,  as  it wastes contact material.  Replacement is only necessary when the contact has  worn  thin. Replacement contacts for starters or contactors are available as kits Order from Table 5. It is unnecessary to remove any wiring to visually inspect the contacts.  To inspect, loosen the four screws (item D) holding the contact actuator to the contact block.  Lift the contact actuator to expose the contacts. WARNING HAZARDOUS VOLTAGE. Disconnect all power before manually operating equipment. Manual operation with power on can cause contact arcing and unexpected energization of load, resulting in personal injury or equipment damage. Manual operation of contactors and starters may be accomplished by pushing  the  contact carrier  down  with  a  screwdriver.    There  is  a  step  on  the  outside  of  the  contact  carrier suitable for this use. To remove the coil, loosen the two captive cover screws (item A).  Disconnect wires from the  coil  terminals  and  remove  the  cover.    Loosen  the  two  screws  (item  B)  holding  the magnet in place.  Remove the coil and magnet.  Manually operate the contact carrier and remove the armature.  Separate the coil from the magnet. To replace the coil,  first  assemble  the  magnet,  coil  and  armature  and  insert  the  complete unit.  Approximately 3/8 of  an  inch  space  should  exist  between  the  top  outside  surface  of the coil and inside surface of the magnet.  If this space does not exist and magnet tends to © 1992 Square D All Rights Reserved ?Revised 1/92 (page 3-113)







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