Sensor Calibration Using Starview; General Trouble Shooting - Maersk Container Industry Star Cool SCI-20 Operating And Service Manual

20.16 Sensor calibration using StarView

When placing the USDA and cargo probes in ice water, they should display 0°C. If any reading
deviates from this value the probe requires calibration. Calibration is simply done by looking at the
reading for the USDA sensor and then double clicks in e.g. CalUs1. In the popup window enter the
calibration value required in order for the sensor to reach 0°C. Then press Enter.
Do this calibration for each of the USDA and cargo sensors. Max. offset calibration is 3K. If more is
required, the probe must be replaced.

21. General trouble shooting

Hints for general trouble shooting.
1. Unit will not start up.
Check that power is applied to the unit.
Check that fuses at QS1, F1 and or F2 are not blown.
Check the alarm list. Clear all alarms and the causes.
The unit is wired for emergency operation but the parameter F03 FC type under S05 Configu-
ration in the Service menu
The line F03 under the Service menu
have not been correctly mounted for emergency operation.
2. Unit starts but stops shortly after. Check that the condenser motor is rotating and that the air is
blowing away from the unit. Check if the high pressure switch alarm is active in the alarm list.
Temperature sensors not working properly. Check that they are placed on the pipes and are
inside the isolation.
3. Unit is running but is not bringing the temperature down to temperature setpoint. The cargo is
very warm – it takes a long time to cool it down. The ambient temperature is very high – the
condenser can only cool a little so the cooling capacity is small and the cool down process takes
longer time. The hot gas valve may be leaking so that the hot gas is by-passing the condenser
and is pumped into the evaporator and heating it up. The expansion valve is not opening and
no cooling refrigerant is pumped into the evaporator. The condenser pressure will be very high.
The unit has been put in manual phase detecting mode and all motors are running the wrong
way. The compressor will pump correctly but there is very little cooling capacity in the condenser
and the air flow is wrong inside in the box. One of the motors (condenser or evaporator) is run-
ning in the opposite direction.
is not set to NONE.
is set to NONE for emergency operation but the wires
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