4-38
Copyright 2017 Cummins Inc.
TABLE 4-26C. HIGH AC VOLTAGE SHUTDOWN (301)
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
“HIGH AC
VOLTAGE ”
shutdown
(301)
message.
5. The problem may be the analog board
(A33).
NOTE: To determine the “3-phase
ave” signal voltage range for Step 3b,
use the following formula:
V
out
3-phase ave = V
in
(2.9PT) 5%
V
in
= Actual alternator output voltage
(phase-to-neutral)
PT = PT primary (120, 240 or 346)
*5. Using the harness tool, check the “3-phase
ave” signal at A33 J2-18.
If the voltage is within the expected range,
replace A32. If the voltage is not within the
expected range, replace A33. See Note.
6. The problem may be in the generator
set itself.
6. Refer to the alternator servicing procedures in
Section 6.
*CAUTION: Wearing a wrist strap, set S12 to Off and A32 S5 to Standby before connecting/disconnecting harness plugs.
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