22 TT-1596 8/22
5.4 Generator Set Maintenance
When it is necessary to perform maintenance or service
on the generator sets, use the following procedure to
remove one generator set from the system at a time.
1. On the generator set to be serviced, press the
AUTO and OFF buttons on the RDC2 controller
simultaneously for about 1 second.
2. Wait for the generator set to shut down. Turn off
non-critical appliances to reduce the load, if
necessary.
3. Press OFF to shut down the generator set, if
necessary.
4. Disconnect utility power to the generator set.
5. Disconnect the generator set battery, negative (- )
lead first.
6. Follow the instructions in the generator set manual
to service the unit as needed.
7. Reconnect the generator set battery, negative (- )
lead last.
8. Reconnect utility power to the generator set.
9. Press the AUTO and RUN buttons on the RDC2
controller simultaneous ly to return the system to
runtime hours mode, if desired.
5.5 Faults
Fault messages displayed on the RDC2 controller are
shown in Figure 22 and Figure 23.
To clear the warnings listed in Figure 22 press AUTO or
OFF.
D Press AUTO to clear the fault without shutting down
the generator set.
D Pressing OFF will clear the fault AND stop the
generator set.
LossOfComAPM Fault
One possible c ause of this fault is that the primary
controller is powered down. If the primary controller is
powered off without using the AUTO-OFF sequence
described in Section 5.3.2, the paralleling system will
not function. To allow the system to function, go to the
secondary controller’s Communications menu, RBUS
network. Set RBUS primary to True on the secondary
controller. When the former primary controller powers
up again, set RBUS Primary? to False. .
Fault Text Description
When Active Warning
Delay
Display Cleared On
Voltage L1-L2 High Warning Over Voltage Paralleled 10 Press AUTO or OFF *
Voltage L1-L2 Low Warnin g Under Volt age Paralleled 10 Press AUTO or OFF *
Frequency High Warning Over Frequency Paralleled 10 Press AUTO or OFF *
Frequency Low Warning Under Frequency Paralleled 10 Press AUTO or OF F *
Current A High Warning Over Current Paralleled 10 Press AUTO or OFF *
Reactive Power Low Warning Loss of Field Paralleled 10 Press AUTO or OFF *
Real Power High Warning Over Power Paralleled 10 Press AUTO or OFF *
Real Power Low Warning Reverse Power Paralleled 10 Press AUTO or OFF *
* Pressing OFF will stop the generator set.
Figure 22 Warning Messages (protective relay disconnect)
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