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S A F E G E A R ® M O T O R C O N T R O L C E N T E R /A R C - R E S I S TA N T M E TA L - C L A D C O N S T R U C T I O N
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1.
Make sure all contactor assemblies are open (OPEN).
2.
Rack the contactors out to the disconnected position.
3.
Open all control power source contacts, if supplied.
4.
Check each control switch or push-button. Make sure that they are open position (OPEN).
5.
Connect a temporary control power source to the circuit load terminals in the MCC. Energize the control circuit
from the temporary control power source.
6.
Rack the contactor to the connected position (CONN.). Open and close the contactor to verify the correct
connection in the secondary plug. Repeat the same operation for every contactor assembly, one at a time.
7.
Test the contactors for closing and tripping, operated on manual and electrically through the control circuit, while
they are in the "DISCONN." position.
8.
De-energize the control circuit. If AC control power is from transformers in the MCC, remove the separated
temporary control power source. Reinstall all fuses in the transformer circuit.
9.
Set all relays, regulators and other devices for proper operation of loads. The factory does not set the relays.
10. Remove shorting screws from the terminal blocks in the current transformers circuits. Store screw in the tapped
holes in the corners of the blocks (see Figure 5).
NOTE: Verify the proper phasing of all main circuits according to diagram of control.
To open the short circuit device:
1.
Make sure that the transformers circuits are completed. Do not put one of energized switch in a secondary open
circuit.
2.
To open the short circuit device:
2.1) Single Ratio – Remove and store the shorting screw "a". Do not remove the ground screw "b".
2.2) Multi Ratio – Remove the shorting screw "a" and insert it according to the connection diagram below.
a
b
Single Ratio
Multi Ratio
Fig. 5 Short circuit device
a
b
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