Fault Description Causes Possible Solution
OC Overcurrent * Too short acceleration
time
* Short circuit at output
side
* Locked rotor with moto
* Parameter tuning is not
correct
* Prolong acceleration time
* Ask if motor is cable broken
* Check if motor overloads
* Reduce VVVF compensation value
* Measure parameter correctly
OC1 Overcurrent1
O.L1 Inverter Overload * Load too heavy * Reduce load;
* Check drive ratio
* Increase inverter’s capacity
O.L2 Motor Overload * Load too heavy * Reduce load
* Check drive ratio
* Increase motor’s capacity
O.E. DC Over-Voltage * Supply voltage too high
* Load inertia too big
* Deceleration time too
short
* Motor inertia rise again
* Parameter of speed loop
PID is set abnormally
* Check if rated voltage is input
* Add braking resistance(optional)
* Increase deceleration time
* Set the parameter of rotary speed
loop PID correctly
P.F1. Input Phase Loss * Phase loss with input
power
* Check if power input is normal
* Check if parameter setting is correct
PF0 Output Phase Loss * Motor is broken
* Motor wire is loose
* Inverter is broken
* Check if wire of motor is loose
* Check if motor is broken
L.U. Under-Voltage Protection * Low voltage on the
input side
* Check if supply voltage is normal
* Check if parameter setting is correct
O.H. Heatsink Overheat * Environment
temperature too high
* Poor ventilation
* Fan damaged
* Carrier wave frequency
or compensation curve is
too high
* Improve ventilation
* Clean air inlet and outlet and radiator
* Install as required
* Change fan
* Decrease carrier wave frequency or
compensation curve
AErr Line Disconnected * Analog signal line
disconnected
* Signal source is broken
* Change the signal line
* Change the signal source
Err1 Password is Wrong * When password
function is enabled,
password is set wrong
* Set password correctly
Err2 Tuning Parameters Wrong * Incorrect motor
parameters
entered
* Connect motor correctly
* Enter correct motor data
Err3 Current Malfunction Before
Running
* Current alarm signal
exists
before running
* Check if control board is properly
connected to power board
* Contact Parker
Err4 Current Zero Excursion
Malfunction
* Flat cable is loosened
* Current detector is
broken
* Check the at cable
* Contact Parker
Err5 PID Parameters are
set Wrong
* PID parameters are set
wrong.
* Set the parameters correctly
When the inverter is tripped check what the cause is and rectify as required. Take counter measures
by referring to this manual in case of any malfunctions on inverter. Should it still be unsolved, contact
the manufacturer. Never attempt any repairs without due authorization.
Troubleshooting 5-2
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