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Chapter 5 Troubleshooting and maintenance
5.1 Error display and corrective action
5.1.1 Manual Reset and Auto-Reset
Display
-OV-
Voltage too high
when stopped
-LV-
Voltage too low
when stopped
-OH-
The inverter is
overheated when
stopped
OH-C
The inverter is
overheated during
running
CtEr
Current Sensor
detection error
HPErr
Inverter capacity
setting error:
Inverter capacity
setting 13-00
does not match
the rated voltage.
Err4
CPU Unusual
interruption
EPr
EEPROM
problem
COt
Communication
error
Faults which cannot be recovered manually
content
Detection circuit malfunction
1. Power voltage too low
2. Pre-charge resistor or fuse
burnt out.
3. Detection circuit malfunction
1. Detection circuit
malfunction
2. Ambient temperature too
high or bad ventilation
1. IGBT temperature is too
high or poor ventilation
2. temperature sensor error or
circuit malfunctions
Current sensor error or
circuit malfunction
The inverter capacity setting
(13-00) does not match the
hardware voltage levels
External noise interference
Faulty EEPROM
Communications disruption
Cause
5-1
Corrective action
Consult with the supplier
1. Check if the power voltage
is correct
2. failed resistor or fuse
3. Consult with the supplier
Improve the ventilation
conditions, if no result then
replace the inverter
1. Reduce carrier
frequency
2. Improve the ventilation
conditions, if no result then
replace the inverter
Consult with the supplier
Check the inverter capacity
setting (13-00) to meet the
hardware voltage levels.
1. Remove the interference
source then restart by
switching power OFF/ON
2. If not resolved then Consult
with the supplier
Consult with the supplier
Check the wiring
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