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4.8 — Disabling a Generator for Maintenance
*
There are two conditions when maintenance checks may have to be performed on the unit:
When the unit is in standby mode (automatic) and NOT running. To disable the unit from starting in
1.
this condition, in order to perform maintenance checks or service, follow the steps in Subsection
4.8.1.
When the unit is running and providing power to the load. To shut down the unit safely, without
2.
damaging loads or the generator, follow the steps for shutting down a unit while in operation. See
Subsection 4.8.2. Before shutting down an operating unit for maintenance, always make sure that
personnel are warned that the power will be shut down temporarily, so that equipment that might be
damaged can be properly turned off or placed in standby.
4.8.1— To Disable the Generator From Starting
To prevent injury, BEFORE performing any maintenance, disable the generator set from starting and/or connecting to
the load:
Set the control panel AUTO/OFF/MANUAL switch to the OFF position.
1.
Remove the control panel fuse (F2-10A fuse).
2.
Turn off power to the battery charger (remove battery charger ATC style fuse or open the battery charger circuit
3.
breaker located in the load control panel).
Disconnect the negative battery cable.
4.
NOTE: The battery charger must be turned off BEFORE disconnecting the battery cable to prevent an over-
current condition from burning out sensitive control panel components and circuits.
NOTE: Following any maintenance, reverse these steps to insure the unit is returned to standby setup for nor-
mal operation.
4.8.2— Shutdown and Restart an Operating Generator
If the unit is operating and required checks must be performed:
Ensure that power to the load can be interrupted (warn any equipment users that there will be a temporary power
1.
disruption). There may be other procedures that must be done before shutting a unit down, depending on appli-
cation.
Open the generator Main Line Circuit Breaker (MLCB).
2.
Allow the unit to cool down (running at no-load) for approximately 5 minutes to prevent damage to critical engine
3.
components.
Set the control panel AUTO/OFF/MANUAL switch to the OFF position. There may be safety tag-outs or lockouts
4.
required at this point, depending on application.
Perform the necessary maintenance checks or tasks (based on the hourly requirements).
5.
When all checks have been completed and any discrepancies corrected, set the control panel AUTO/OFF/MAN-
6.
UAL switch to the AUTO position.
When the generator is running, and all engine/generator parameters (voltage, frequency, coolant temp, oil pres-
7.
sure, etc.) have been verified as correct, close the generator Main Line Circuit Breaker (MLCB). The unit will
accept and carry the load.
Make a last visual inspection of the generator set to make sure it is operating properly.
8.
Owner's Manual for Stationary Industrial Generators
Maintenance
27
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