52
2
(FC_5)
UNDER FREQUENCY
The troubleshooting steps for under-and over-
frequency faults are identical. Refer to Fig. 29 to
troubleshoot (FC_5) & (FC_6) fault indications.
The low frequency shutdown feature is designed
to protect the generator and its loads from an
output frequency that is too low. The system
control panel senses frequency at Wire # L1 and
Wire #L2. If output frequency drops below 55 Hz
for three seconds, the system control panel will
shut down the generator.
The digital display will show FC-5 and the remote
LED will repeatedly flash five times with a pause.
Under frequency may be caused by:
• A restricted air filter
• A failure in the generator sense wiring
(L1 or L2)
• A failed engine governor
• Problems with the fuel delivery system
• Excessive loads
• A failure at the system control panel
• An engine that is not producing
sufficient power
TEST 1 - Check No-Load & Full-Load
Frequency
For the following procedures, we recommend the
use of Briggs & Stratton Tach and Hour meter
(#19389) and Briggs & Stratton Frequency Meter
(#19543) with Frequency Adapter (#19580).
Perform the following tests under full electrical
loads with all gaseous fuel appliances turned ON
and operating.
• No-Load RPM specification is 3750 +/-
100 RPM / 62.0-62.5Hz
• Full-Load RPM specification is 3420 +/-
100 RPM / 57.0-62.5 Hz
Check No-Load Frequency
1. Turn the SYSTEM switch to OFF.
2. Remove the 15 Amp fuse from the system
control panel.
3. Remove the circuit breaker cover.
4. Make sure the generator circuit breaker is
ON.
5. Reinstall the 15 Amp fuse in the system
control panel.
6. Set SYSTEM switch to AUTO, then push
and hold MANUAL OVER-RIDE to start
the unit.
7. Measure frequency at the load side of the
circuit breaker (Figure 54).
WARNING
Battery posts, terminals, and related
accessories contain lead and lead
components, chemicals known to the State
of California to cause cancer and
reproductive harm. Wash hands after
handling.
CAUTION
Follow the manufacturer’s instructions for the
type of frequency meter that you are using.
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