6
‘M-PACT’ ancillary equipment - Fitting instructions
Motorised spring charging unit
Ensure circuit breaker is open with springs discharged. For DC
motors, fix motor filter in position shown (if supplied, Fig. 16)
using the two fixing screws to a torque of 5Nm.
Fig. 16
Motor filter
Make plug connection between filter unit and supply.
Remove earth strap fixing and attach the additional motor filter
ground wire to the base plate as shown (fig 17) to a torque of
7Nm.
Fig. 17
Orientate the motor unit as shown (Fig. 18), locating the
gearbox bearing onto the protruding motor drive shaft, pushing
it home until flush with the mechanism sideplate. If it does not
move easily to the flush position, pull the charging handle
gently down to ease movement.
Fix in position using three M5 bolts through holes provided in
the gearbox endplate (tighten to 7Nm torque).
Fig. 18
Motor drive shaft
Manually charge the closing springs and carefully locate the
plastic switch actuator over the protruding drive shaft (Fig. 19),
ensuring the switch operating arm is correctly positioned
(switch arm should be in the ‘cut out’ portion of the motor
switch actuator). Use a suitably sized washer and M4 bolt (into
the shaft end) to fix actuator (tighten to 5Nm torque).
Connect modular plug from filter to motor unit.
Connect the remaining earth wire from the filter to the earth
point on the rear of the motor body.
Fig. 19
Reverse the above procedure to remove the motor unit.
Shunt trip - Closing coil - Undervoltage release
The shunt trip and closing coils are clip-on devices and require
no fasteners. The undervoltage release coil assembly similarly
clips on, there is however an additional circuit board that
needs mounting to the breaker mechanism.
Mounting positions of the three units which are not
interchangeable and must be as in Fig. 20.
Shunt trip
Closing coil
Undervoltage release
Fig. 20
To mount the coils, tilt the unit forward and engage front hooks
into the top support plate. Next tilt backwards until the rear
hooks engage in the slots and press down into position (Fig.
21).
Fig. 21
Connect the leads as in the schematic wiring diagram in
section 3.
Note:
•
Shunt trip has modular plug connector.
•
Closing coil and Undervoltage release both have spade
connectors to secondary isolating contacts.
To remove the coils, disconnect and tilt forward until rear
hooks disengage then lift to release the front hooks.
Note, for undervoltage assemblies, fit the solenoid first.
Modular plug
Ground wire
Motor switch
actuator
Modular switch
