CAUTION
Always keep in mind the recommended safety procedures when working in medium voltage equipment.
For the safety of personnel extracting the controller of the MCC, all components should be electrically disconnected by means of a visible break, securely
grounded, locked out and tagged in accordance with personnel precautions.
REMOVAL:
(Refer to Figure 4 for compartment detail and Appendix A for controller detail).
1. Confirm (through window) that controller has been opened and racked to the disconnect position.
2. Open MCC controller compartment door to its fully opened position. The interlocking system prohibits racking while the door is open.
3. Align lift truck left and right platform guides with MCC latch openings.
4. Raise platform for easy insertion of platform guides, then lower lift truck until platform guides are fully engaged and hooked into MCC compartment cell.
5. Pull back on lift truck to insure platform is fully engaged and level.
6. Grasp lower truck handles on both sides of controller and pull handles outward to unlatch the controller from the MCC frame.
7. Pull controller from compartment onto lift platform insuring cell interlock tabs are engaged into the platform slots.
RACKING:
The racking system is unique and features two-positions:
“Test/Disconnect”
position, primary contacts are separated from the bus contacts while the secondary contacts remain engaged to the controller to be tested.
Shutters shall be interlocked in the closed position
“Connected”
position, both primary and secondary contacts shall be engaged.
CONTROL CIRCUIT CHECKOUT:
The preferred method to check the control circuit is to furnish a separate temporary control power source of the required control voltage rating. The temporary
source must have a properly coordinated backup protective device in the circuit.
Set the device to clear any faults that might occur. Initially all controllers should be racked out (“DISCONNECTED” position) and the main circuit deenergized and
grounded. When AC control power is from control power transformers in the MCC, remove all fuses in the transformer circuits.
1. Make sure all controller are open (OPEN).
2. Rack the controllers out to the open position (DISCONN.).
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 controller to the connected position (CONN.). Open and close the controller to verify the correct connection in the secondary plug. Repeat the same
operation for every controller assembly, one at a time
7. Test the controllers 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.
NOTE: Verify the proper phasing of all main circuits according to diagram.
9
SafeGear
®
Motor Control Center Controller
Installation, Operation and Maintenance Manual
