EN - 49
EN - 48
ENGLISH
Failure Diagnosis at the time of Abnormal Discharge Gas Temperature
When the discharge gas temperature goes up abnormally, compressor is stopped for protecting the compression
components of the compressor and discharge gas temperature abnormality alarm is generated at the same time.
In such a case, check the problem position and apply appropriate actions in the sequence shown below.
Failure Diagnosis
Checking the refrigeration cycle operation condition
(1) Isn’t the refrigerant quantity insufficient?
Refer to the “Adjusting Refrigerant Quantity of the Refrigeration Unit” in
the “Adjustment during Operation”
(2) Isn’t the suction gas temperature exceeding the limit?
(3) Isn’t the low pressure at 0.00MPa or below?
Compressor Operation Status Check
(1) Is the operation sound normal?
(Metallic sound is higher when abnormal)
(2) Is the operation current value normal?
(3) Is the temperature of cooled load no problem?
(4) Is any other abnormal point detected?
Control Component Check
(1) Mounted condition of the discharge gas temperature sensor
Sensor body, connector on the control PCB
Failure Diagnosis of Gas Cooler Fan
(1) When the ground fault protector shuts OFF.
1. Check the insulation resistance between each terminal of the power supply unit, fan motor inverter (Inverter
V1000) and the ground (G terminal).
..... When the insulation resistance is 1 M Ω or below, insulation failure exists in the Inverter V1000 or fan
motor.
2. Disconnect the fan motor lead wire from the Inverter V1000 and check the insulation resistance between the
ground.
..... When the insulation resistance is 1 M Ω or below, insulation failure exists in the fan motor.
(2) When the fan motor does not rotate normally.
1. While the fan motor is powered, it does not rotate smoothly (stopping or uneven rotation) or generates roaring
noise.
..... Fan motor bearing failure is the cause.
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