62-11389
7−47
Alarm
NO.
Steps Alarm/Cause Corrective Action
73 NO A/C POWER-CHECK POWER CORD
• TRIGGER–ON: The unit is set to operate in standby AND no AC power
• UNIT CONTROL: Engine Operation: this alarm will not activate in Engine Operation.
Standby Operation:
If the “NO POWER SWITCH TO DIESEL” Functional Parameter is set to “No” or
the “NO POWER SWITCH TO DIESEL” Functional Parameter is set to “Yes”
and the “NO A/C POWER” Configuration is set for “Alarm and shutdown” the
refrigeration system will shutdown (because of the loss of power) with the alarm
on and PSCON still energized.
If the “NO POWER SWITCH TO DIESEL” Functional parameter is set to “Yes”
and the “NO A/C POWER” Configuration is set to “Switch To Diesel” the unit will
remain off for 5 minutes, then start the engine. The unit will remain in Engine
Operation until the minimum run time has expired (regardless if the unit is set for
Start Stop or Continuous) and until standby power has been restored continually
for 5 minutes.
• RESET CONDITION: Auto Reset when AC power is restored or the alarm may be manually reset
via keypad or by turning the unit off, then back on. If the unit is running in Engine Backup when the
A/C power has been restored for 5 continuous minutes and the above conditions have been met,
the engine will stop and the unit will restart in Standby Operation.
NOTE: Follow the steps below until a problem is found. Once a repair or correction has been made, the active
alarm should clear itself (see 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 Circuit Breaker On The Main External Power Supply
a. Check circuit breaker. 30A supply circuit breaker - Must be on.
b. Check the voltage in the plug. 460V / 3 / 60Hz.
2 Check Power Cord
a. Inspect connections in the socket
and the plug.
Connections must be tight.
b. Inspect the cable. Cable must not be frayed, cut or damaged.
3 Check For Power In The Control Box
a. Check for voltage at PSCON L1-L2,
L2-L3, L1-L3.
All three readings must be 460V "10% .
b. Check for voltage at PSCON2
L1-L2, L2-L3, L1-L3.
All three readings must be 460V "10%.
4 Check Connections
Check for bad connections in the
control box.
Connections and wire crimps must be tight.
5 Check Phase Reversal Module (PRM)
a. Check for voltage at 5MP04. Must be +12 VDC.
b. Check Phase Reversal Module for
correct operation.
See Section 8.9.2. Replace PRM if defective.
To Next Page
Loading...
