Fault Diagnosis And Solution - INVT SPC Series Operation Manual

SPC Series Solar Pump Inverter
Do as follows if the inverter encounters a fault:
1. Check whether there is any exception on the keypad. If yes, contact the local INVT
office.
2. If no, check function group P07 to view the fault record parameters and understand
the actual condition.
3. See the following table for a detailed solution and check for exceptions.
4. Rectify the fault or ask for help.
5. Ensure the fault has been rectified, perform fault reset, and run the inverter again.
Fault code
OV1
OV2
OV3
OC1
OC2
OC3

7 Fault diagnosis and solution

Fault type
Overvoltage

during ACC
Overvoltage

during DEC

Overvoltage

during constant
speed running

Overcurrent
during ACC
Overcurrent

during DEC



Overcurrent
during constant
speed running


Possible cause
The input voltage is
abnormal.
There is large energy
feedback.
No braking
components.
Energy-consumption
braking is not
enabled.
The acceleration or
deceleration is too
fast.
The voltage of the
grid is too low.
The power of the
inverter is too low.
The load transients
or is abnormal.
There is to-ground
short circuit or output
phase loss.
There is strong
external interference.
The overvoltage stall
protection is not
enabled.
-50-
Fault diagnosis and solution
Solution
Check the input power.

Check whether the

loaded DEC time is too
short or the inverter
starts when the motor is
rotating.
Install the braking

components.
Check the setting of

related function codes.
Increase the ACC time.

Check the input power.

 Select the inverter with
larger power.
 Check whether there is
short circuit (to-ground
or inter-wire) in the load
or the rotation is not
smooth.
Check the output

wiring.
Check whether there is

strong interference.
Check the setting of

related function codes.