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GD350A series high-performance multifunction VFD
-254-
Fault
code
Fault type
Possible cause
Solution
protection
peripheral equipment
OUt3
Inverter unit
Phase-W
protection
OV1
Over-voltage
during
acceleration
Exception occurred to input
voltage;
Large energy feedback;
Lack of braking units;
Dynamic brake is not enabled
Check input power;
Check whether load
deceleration time is too short;
or the motor starts during
rotating;
Install dynamic braking units;
Check the setup of related
function codes
OV2
Over-voltage
during
deceleration
OV3
Over-voltage
during constant
speed running
OC1
Over-current
during
acceleration
Acceleration is too fast;
Grid voltage is too low;
Inverter power is too small;
Load transient or exception
occurred;
To-ground short circuit or output
phase loss occur;
Strong external interference
sources;
Overvoltage stall protection is not
enabled
Increase acceleration
/deceleration time;
Check input power;
Select the VFD with larger
power;
Check if the load is short
circuited (to-ground short circuit
or line-to-line short circuit) or
the rotation is not smooth;
Check the output wiring;
Check if there is strong
interference;
Check the setup of related
function codes.
OC2
Over-current
during
deceleration
OC3
Over-current
during constant
speed running
UV
Bus
undervoltage
fault
Grid voltage is too low;
Overvoltage stall protection is not
enabled
Check grid input power;
Check the setup of related
function codes
OL1
Motor overload
Grid voltage is too low;
Rated motor current is set
improperly;
Motor stall or load jumps violently
Check grid voltage;
Reset rated motor current;
Check the load and adjust
torque boost
OL2
Inverter
overload
Acceleration is too fast;
The motor in rotating is restarted;
Grid voltage is too low;
Increase acceleration time;
Avoid restart after stop;
Check grid voltage;