Operation

To help ensure proper operation of the MCC, check the items listed below before energizing the MCC:

1. Complete the maintenance procedures beginning in Maintaining the MCC and continuing up to Insulation Test. This initial maintenance is necessary to detect any shipping damage or loose connections. Do not energize the MCC until initial maintenance is complete.

   NOTE:

   The following maintenance procedures are not necessary before energizing the MCC for the first time: Stab Assemblies, Starter Contacts, and Barriers/Insulators.

2. Perform an insulation test on the MCC (see Insulation Test).

3. If the MCC is equipped with ground fault protection, properly adjust and test, the ground fault protective device before energizing.

   Pre-operation Check

   

4. Remove all blocks or other temporary holding means from the electrical devices.

5. Remove any secondary shunt bars from the current transformers. Do not operate a current transformer with its secondary open-circuited.

6. Manually exercise all switches, circuit breakers, and other operator mechanisms to help ensure that they are properly aligned and operate freely.

7. Electrically exercise all electrically-operated switches, circuit breakers and other mechanisms (but not under load) to help ensure that the devices operate properly. An auxiliary source of control power may be required.

8. Verify proper interval and contact operation of the timers.

9. Verify that proper overload units are installed by checking the overload selection tables against motor full load current. MotorLogic, TeSys T, TeSys Tera and IEC overload relays (if supplied) do not require thermal units but are set at the lowest setting at the factory.

10. Verify that all load and remote-control connections have been made and that they agree with the wiring diagrams provided.

11. Verify that all ground connections are made properly.

12. Install the covers and close the doors; verify all fasteners are properly tightened; verify all mechanism interlocks function.

For ArcBlok 1200 mains:

1. Verify all incoming power cables are properly installed and secured:

   1. Cable lacing is complete per instructions starting on Incoming Cable Lacing Instructions—ArcBlok 1200 Line-side Isolation Cable Vault.

   2. The damper and two springs on the cable vault rear panel are installed and functioning properly.

   3. Closing plates are installed with conduit.

   4. The space between conductors and conduit is sealed with duct seal putty.

2. Verify all ArcBlok 1200 and cable vault covers are replaced and secured correctly.

For ArcBlok 2500 mains:

1. Verify all incoming power cables are properly installed and secured:

   1. Cable lacing is complete per instructions starting on Incoming Cable Lacing Instructions—ArcBlok 2500 Line-side Isolation Cable Vault.

   2. Closing plates are installed with conduit.

   3. The space between conductors and conduit is sealed with duct seal putty.

2. Verify all ArcBlok 2500 and cable vault covers are replaced and secured correctly.