INVT GD100 - Page 6

Do as follows after inverter encounter a fault
1. First, check whether there is something wrong with the keypad. If yes, contact the local
INVT office
2. If there is nothing wrong, check function codes of P07 group, view the corresponding
recorded fault parameters, and identify the actual state when the current fault occurred
based on all the parameters
3. See the following table, check for exceptions based on the specific solutions.
4. Rectify the fault or seek help
5. After ensuring that the fault has been rectified, perform fault reset and start the inverter
FAULT DIAGNOSIS AND SOLUTIONS
Fault
code
Fault type Possible cause Solution
OUt1
VFD unit U-phase
protection
 Acceleration is too fast.
 IGBT module is damaged.
 Misacts are caused by
interference.
 Drive wires are poorly
connected.
 To-ground short circuit occurs.
 Increase the ACC time.
 Replace the power unit.
 Check drive wires.
 Check whether there is strong
interference surrounding the
peripheral device.
OUt2
VFD unit V-phase
protection
OUt3
VFD unit W-phase
protection
OV1
Overvoltage during
acceleration
 The input voltage is abnormal.
 There is large energy feedback.
 No braking components.
 Dynamic brake is disabled.
 Check the input power.
 Check whether the loaded DEC time
is too short or the VFD starts when
the motor is rotating.
 Install the braking
components.
 Check the setting of related function
codes.
OV2
Overvoltage during
deceleration
OV3
Overvoltage during
constant speed running
OC1
Overcurrent during
acceleration
 Acceleration or deceleration is
too fast.
 The voltage of the grid is too low.
 The power of the VFD 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 disabled
 Increase the ACC time.
 Check the input power.
 Select the VFD 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.
OC2
Overcurrent during
deceleration
OC3
Overcurrent during
constant speed running
UV Bus undervoltage
 The voltage of the grid is too low.
 Overvoltage stall protection is
disabled.
 Check the grid input power.
 Check the setting of related function
codes.
OL1
Motor overload
 The grid voltage is too low.
 The rated current of the motor is
set incorrectly.
 Motor stall or load jumps
violently.
 Check the grid voltage.
 Reset the rated current of the motor.
 Check the load and adjust torque
boost.
OL2 VFD overload
 Acceleration is too fast.
 The rotating motor is reset.
 The grid voltage is too low.
 The load is too heavy.
 The motor power is too small.
 Increase the ACC time.
 Avoid the restarting after stop.
 Check the grid voltage.
 Select a VFD with larger power.
 Select a proper motor.