EN - 53
EN - 52
Failure Diagnosis
(1) When the refrigeration unit stopped by activation of the ground fault protector,
possible cause is as follows. Check all of the following causes.
Cause
Method of Checking
Method of Action
Compressor failure
Check insulation resistance between each phase of
compressor and case.
Less than 1 MΩ indicates motor failure.
Replace the compressor
Check the winding resistance of the compressor.
0.62 Ω to 0.72 Ω (AT 25 °C) indicates no problem.
Replace the compressor
Failure of an electric
component other than
compressor
Check the insulation resistance between each terminal of the
Inverter V1000, Inverter A1000 and ground (G terminal). Less
than 1 MΩ indicates insulation failure of the Inverter V1000 or
Inverter A1000.
Replace the Inverter V1000 or
Inverter A1000.
Be sure to eliminate the cause of the failure before supplying the power (turning the ground fault
protector ON).
Failure Diagnosis of Inverter Unit
When performing an inspection or replacement, make sure to start working after the high voltage danger
indication red light on the inverter V1000 and inverter A1000 has been turned off.
(Approx. 5 minutes are required for the capacitor to discharge)
Electrical box internal layout
Caution
Caution
Left side of
refrigeration unit
Front of
refrigeration unit
FM (Box back side)
Reactor1
Reactor2
Inverter
A1000
Inverter
V1000 FIL2-EN
-PCB
Power source terminal block
Control terminal base
S1
Operation switch
CR2-EN
-PCB
CRD2-EN-PCB
From left 1X1, 1X2, 1X3
Liquid tube electromagnetic
terminal base
External alarm terminal base
External communication
terminal base
Showcase operation
terminal base
01_OCU-CR1000VF8A.indd 52
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