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The troubleshooting steps for under- and over-
frequency faults are identical.
The low frequency shutdown feature is designed to
protect the generator and its loads from an output
frequency that is too low. The control panel senses
frequency at Wires #E1 and #E2. If output frequency
drops below 55 Hz for three seconds, the control panel
will shut down the generator.
The digital display will show FC_5 and the remote LED
2
will repeatedly flash five times with a pause.
2
Under frequency may be caused by:
• A restricted air filter
• A problem in the generator sense wiring
(#E1 or #E2)
• Incorrect engine governor adjustment
• Problems with the fuel delivery system
• Excessive loads
• Engine that is producing insufficient power.
• A problem in the control panel
TEST 1 - Check No-Load & Full-Load
Frequency
For the following procedures, we recommend the use
of Briggs & Stratton Digital Tach and Hour Meter
#19389.
WARNING Battery posts, terminals, and related
accessories contain lead and lead compounds, chemicals
known to the State of California to cause cancer and
reproductive harm. Wash hands after handling.
Perform the following test under full electrical loads
with all gaseous fuel appliances turned ON and
operating.
No-Load RPM specification is 62.0-62.5 Hz
/ 3750 ± 100 RPM
Full-Load RPM specification is 57.0-62.5 Hz
/ 3420 ± 100 RPM
48
(FC_5) UNDER FREQUENCY
Check No-Load Frequency
Figure 32
Figure 33
1. Remove the four screws to gain access to the main
circuit breaker.
2. Reset the fault code detection system. See Resetting
the Fault Code Detection System.
3. Ensure the generator circuit breaker is ON.
4. Set control panel system switch to AUTO, then push
and hold MANUAL OVER-RIDE to start the unit.
5. Measure frequency at the line side of the circuit
breaker (Figure 32).
• If frequency at no-load is correct, proceed to
Check Full-Load Frequency.
If the no-load frequency is not correct,
6.
needle nose pliers or Tang Bender #19229 or
#19480, bend spring anchor tang (A, Figure 33)
slowly up or down until frequency is 62.0 to 62.5 Hz.
use
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