2-6
62-10630
Change 07/03
2.10 ALARM DISPLAY
In the event of a malfunction the unit will be shut down
and the Cab Command will display an error message or
alarm message. The message will remain displayed
until the malfunction is corrected. If standby power is
connected and the malfunction is such that standby
operation can be allowed, the unit will start in the
standby mode. Error messages are provided in
Table 2-1 while a listing of the alarm codes is provided in
Table 2-2.
Table 2-1 Error Messages
Malfunction : evaporator temperature
probe
Low battery voltage low alarm
(Refer to paragraph 2.10.1)
Twin power supply (road and
standby)
Incorrect set-point setting
Setpoint lower than maximum
setpoint but in the range
--29
_
C/+30
_
C
2.10.1 Low Battery Voltage Alarm
If the battery voltage drops below 10 V the unit shuts
down and the cab command displays the message
“bAt”. Unit restart is automatic and time-delayed if the
voltage rises to the normal level.
2.10.2 Accessing Alarm Messages
Current alarms will be displayed with an “A” preceding
the alarm number while past alarms will be displayed
with a “P” preceding the alarm number. To access the
alarm messages:
Press SET for 5 seconds : enables
access to alarm messages.
In the event of more than one alarm,
press the + and -- keys to list them.
2.10.3 Clearing Alarm Messages
The alarm list provides information on current alarms
and past alarms which may be helpful in trouble
shooting unit problems. Once all the alarm information
has been noted and service is complete, the alarm list
may be cleared. To clear the alarm messages:
Press the ON,
the + and the
-- keys at the same time.
Table 2-2 Alarm Messages
No malfunction.
Unit in operation.
Low pressure switch (LPS) open (Road)
High pressure switch (HP1) open
Standby compressor thermal overload
(PTC) open
Road compressor clutch (CLHR) mal-
function
Standby contactor (MC) high amp draw
Condenser fan motor (CFM) high amp
draw
Fan Speed Alarm
Hot water solenoid valve (HWV) high
amp draw (option)
Hot gas valve (HGS1) high amp draw
Quench solenoid valve (BPV) high amp
draw
Condenser pressure control valve
(HGS2) high amp draw
High temperature alarm
Low temperature alarm