4-41
Copyright 2017 Cummins Inc.
TABLE 4-28. UNDER FREQUENCY SHUTDOWN (313)
WARNING
Many troubleshooting procedures present hazards that can result in severe personal inju-
ry or death. Only qualified service personnel with knowledge of fuels, electricity, and machinery haz-
ards should perform service procedures. Review Important Safety Instructions page.
Indicator(s) Possible Cause Corrective Action
“UNDER
FREQUENCY”
shutdown
(313)
message.
1. Improper setup.
2. Overload.
3. Fuel or air delivery problem.
4. The governor output module (A38),
the digital board (A32), or the engine
interface board (A31) could be bad.
1. Check Initial Setup (set size) and correct, if nec-
essary.
2. Check the load and correct any overload, if nec-
essary.
Disconnect the load. Reset the control and at-
tempt to restart the generator set.
3. If the engine starts and runs, refer to the engine
fuel/air delivery service procedures.
*4. Disconnect the wire to the fuel solenoid, reset
the control, and crank the generator set. DS1
and DS2 on the governor output module A38
should light.
If the duty cycle LED’s (DS3 and DS4) on the
governor output module (A38) become bright,
the governor output module(A38), the digital
board (A32), and the engine interface board
(A31) are functioning properly.
If DS3 and DS4 do not light, A31, A32 or A38
may be bad.
A38 - Crank the generator set, and check
the governor duty cycle on the PCC dis-
play. If the duty cycle is OK (85% max), re-
place governor output module (A38).
If the duty cycle is not OK, the digital board
(A32) or the engine interface board (A31)
may be bad.
A31 - Check for continuity: A31 J1-13 to
A31 J4-19 and A31 J1-14 to A31 J4-12. If
no continuity, replace A31.
A32 - If A31 is OK, replace A32
*CAUTION: Wearing a wrist strap, set S12 to Off and A32 S5 to Standby before connecting/disconnecting harness plugs.
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