Operating and service manual
106 of 222 pages
402
Mcond overheat
Warning
Description
Condenser Motor Overheat
Cause
Indication of an overheated motor or a loose thermistor cable connection
Trouble
shooting
Possible causes:
• Condenser motor defect.
• Defect resistances on the interface/terminal block PCB.
• Cable for measuring condenser motor overheat defect.
• Controller PCB defective.
Accompanied alarms:
• N/A.
Trouble shooting:
1) Turn off unit! See if the condenser fan can turn freely. If it cannot turn,
replace the motor. If the motor is hot, it may be overloaded and jammed
or defect.
2) If the cable for McondOH by inspection is defect, replace cable.
3) Disconnect the cable for McondOH from the connector PCB according to
the wiring schematics inside the control cabinet.
4) Measure the resistance in the cable. If the resistance is more than 1 MΩ,
the cable or the motor is defect and should be replaced. If the resistance
is less than (<) 5 kΩ, the cable and motor should be ok.
5) Check resistances on the interface/terminal block PCB above X33 and
X34. They must be 220 kΩ
6) Turn unit on again. Measure the voltage over the connector for McondOH.
It should be between 4.80V DC and 5.05V DC.
a) If the voltage is inside the above range, connect sensor again. Measure
the voltage over the sensor and check the voltage. If the voltage is less
than (<) 2.5V DC, the measurement is ok. If the alarm after 30 sec.
is still active on the display, the controller PCB is defect - replace the
controller door.
b) If the voltage is outside the range, controller PCB is defect or another
error might affect the voltage. Check other alarms before replacing
controller door.
Criteria
Value above top alarm limit 10K Ohm
Controller
action
Condenser fan motor is stopped
Log
X
Alarm
X
Alarm light
Off
Consequence
Air circulation in container stops causing unit to stop
Elimination
When overheating disappears, alarm will be marked as inactive in alarm list and may
then be deleted. Control is again released, but fan motor will only be allowed to operate
at low speed for the first 5 min. If the error does not reoccur, problem will be considered
solved and condenser fan high speed is again released.
Log data
Parm 1
Parm 2
Parm 3
Parm 4
Parm 5
Active/Inactive
High limit
Current