EN - 50
Failure Diagnosis
Failure Diagnosis of Inverter Unit
(2) When inverter abnormality (E6 * to E7 *) is generated
Possible cause is as follows. Check all of the following causes.
Cause
Method of Checking
Method of Action
Overload condition
(1) Check if the compressor motor current is high.
(2) Check if any overload condition occurred even in a
short duration of time.
Eliminate the cause of overload.
Abnormality of power voltage
Check if the supplied power voltage to the refrigeration unit is
in the range of 220 V ± 22 V / 230 V ± 23 V / 240 V ± 24 V.
Execute maintenance of the
power supply facility.
Failure of the INV-EN-PCB
When the supplied voltage to the refrigeration unit is in the
range of 220V ± 22 V / 230V ± 23 V / 240 V ± 24 V, check
if any abnormality exists in the appearance or component
chipping of the INV-EN-PCB.
Replace the INV-EN-PCB.
(1) Check if any difference exists between the motor
current of the compressor and the current value
displayed on the CRD1-EN-PCB.
(2) No problem if the difference in current value is ±10 % .
Replace the INV-EN-PCB.
When an external cause such as momentary power failure or lightening, or short duration of overload
occurs, an error is generated by momentary overcurrent even without any component failure.
Caution
01̲OCU-CR200VF5.indd 50
01̲OCU-CR200VF5.indd 50
2018/12/28 15:17:16
2018/12/28 15:17:16
