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The low voltage shutdown feature is designed to protect the
generator and its loads from an output voltage that is too
low. When the generator has stabilized, the control panel
senses output voltage on Wires #E1 and #E2. If the control
panel does not sense the proper generator voltage, it will
shut down the unit.
The digital display will show FC_3 and the remote LED will
flash repeatedly three times with a pause.
Low output voltage may be caused by:
• An open control panel circuit breaker
2
• A generator that is overloaded
2
• A restriction in the fuel flow
• A broken or disconnected signal lead (#E1 or
#E2)
• Diminished engine power
• A failed alternator winding
• Open wiring
TEST 1 - Measure Circuit Breaker Load-Side
Voltage
1. Reset the fault code detection system. See Resetting
the Fault Code Detection System.
2. Remove the system control panel cover to gain
access to the circuit breaker.
3. Ensure that the generator circuit breaker is ON and
the 15 Amp fuse is installed.
4. Set control panel system switch to AUTO, then push
and hold MANUAL OVER-RIDE to start the unit.
5. Check for 240VAC at the load-side of the circuit
breaker (Figure 12). The acceptable range is 239-
262VAC.
Figure 12
• If the specified voltage is present, proceed to
TEST 2 - Measure Generator Voltage at control
panel.
• If specified voltage is not present, proceed to
TEST 3 - Measure Circuit Breaker Line-Side
Voltage.
34
(FC_3) LOW VOLTAGE
TEST 2 - Measure Generator Voltage at
control panel
NOTICE: Use care when obtaining measurements on wires. It
is possible to short terminals to control panel electrical
components.
1. With the unit running, measure for 240VAC at control
panel on Pins #E1 and #E2 (A,Figure 13).
Figure 13
2. Repair or replace the wires between the circuit
breaker and #E1 and #E2.
3. Retest for 240VAC.
TEST 3 - Measure Circuit Breaker Line-Side
Voltage
1. Ensure the circuit breaker is ON.
2. Start the generator and measure for 240VAC on the
line-side of the circuit breaker.
• If 240VAC is present, replace the control panel
board.
• If no voltage is present, ensure the circuit breaker
is ON and retest.
• If there is no voltage on the line-side of the
breaker, proceed to TEST 4 - Bypass the AVR.
• If there is voltage on the line-side of the breaker,
but none on the load-side, manually cycle the
circuit breaker and retest. If there is still no
voltage on the load-side, replace the circuit
breaker.
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