Service & Troubleshooting Guide - Home Generator System - Models 040213 and 040234 (15kW)
Section 2 - Troubleshooting Information
Page 43
2
(FC_5)
UNDER FREQUENCY:
IMPORTANT
: The troubleshooting steps for under and
over frequency faults are identical. Refer to Fig. 33 to
troubleshoot
(FC_5)
&
(FC_6)
fault indications.
The low frequency shutdown feature is designed to
protect the generator and its loads from a generator
output frequency that is too low. The CMA senses
frequency at
Wire #s E1 and E2
. If output frequency drops
below 55 Hz for three seconds
, the CMA will shut down
the generator and display
“FC_5”
at the control panel.
NOTE
: If so equipped, the CMA simultaneously
signals the remote LED to flash in a sequence of
five blinks and displays “Under Frequency” on
the Statstation™ screen as well.
Under frequency may be caused by:
• A restricted air filter
• A failure in the generator sense wiring (E1 or E2)
• A failed engine governor
• Problems with the fuel delivery system
• Excessive loads.
• A failure in the CMA
• An engine that is not producing sufficient power
Test 1
Check No Load & Full Load Frequency:
No Load RPM:
3750 ± 100 RPM / 62.0-62.5 Hz
Full Load RPM:
3420 ± 100 RPM / 57.0-62.5 Hz
Full electrical and fuel consumptive loads - all electrical
loads and gaseous fuel appliances turned
ON
and
operating.
Check No Load Frequency
1. Remove the four screws that hold the circuit
breaker cover.
2. Reset the fault code detection system (
“Resetting The Fault Code Detection System” on
page 20
).
3. Set SYSTEM switch to
AUTO
push and hold
MANUAL_OVERIDE
to start unit.
.
Recommended test equipment:
• Briggs & Stratton Tach and Hour meter
(#19389)
• Briggs & Stratton Frequency Meter
(#19543)
with
the frequency adapter
(#19580)
4. Measure frequency at the generator side of the
circuit breaker (Fig. 34).
Fig. 34 - Measure Frequency At Generator Circuit Breaker
If no load frequency is not correct:
• Slowly turn the governor adjustment screw
as
required to obtain a no load frequency of
62.0 Hz - 62.5 Hz
(Fig. 35).
Fig. 35 - Governor Adjustment Screw
CAUTION:
Follow the measurement instructions that
apply to the type of frequency meter you are using.
62-62.5 Hz No Load should be measured.
Summary of Contents for 40213
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