Carrier NDK33BN0KB, Operation & Service Manual

Page: 125 / 270

62-61753-21 7-9
Alarm
NO.
Steps ALARM / CAUSE CORRECTIVE ACTION
15 BATTERY VOLTAGE TOO HIGH

TRIGGER-ON: Voltage at the microprocessor is greater than 17 VDC.

UNIT CONTROL: Engine operation: engine and unit shutdown and alarm.
Standby operation: refrigeration system shutdown and alarm with PSCON
still energized.

RESET CONDITION: Auto Reset after 15 minutes when the voltage at the microprocessor is between
11 and 14 VDC, or alarm may be manually reset via keypad or by turning the unit off,
then back on again.
NOTE: Follow the steps below until a problem is found. Once a repair or correction has been made, the active
alarm should clear itself (refer to reset condition above). Operate the unit through the appropriate modes to see if
any active alarm occurs. Continue with the steps below as necessary.
1 Check Battery Voltage
a. Test voltage at battery with unit off. Must be between 12-16 VDC.
b. Test voltage at battery with unit
running.
Must be between 12-16 VDC.
2 Check Battery Charger Voltage
a. Test voltage at battery charger
output terminal with unit off.
Must be between 12-16 VDC.
b. Test voltage at battery charger
output terminal with unit running.
Must be between 12-16 VDC.
3 Check Voltage At Microprocessor
a. Check voltage reading at micro-
processor input (MPQC1+ to
MPQC2-.)
Energize circuit. (Refer to Note 2 Page 7-2)
Must be between 12-16 VDC.
b. Check voltage reading on micro-
processor display.
Must be within 0.5 VDC of reading obtained in 3a
(above.)