TD350 Series VFD Troubleshooting
-240-
[3] VFD unit
Phase-W protection
poorly connected ;
To-ground short circuit
occurs
interference surrounds the
peripheral equipment
[7] Over-voltage
during acceleration
Exception occurred to input
voltage;
Large energy feedback;
Lack of brake 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 brake units;
Check the setting of related
function codes
[8] Over-voltage
during deceleration
[9] Over-voltage
during constant
speed running
[4] Over-current
during acceleration
Acceleration is too fast;
Grid voltage is too low;
VFD 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 setting of related
function codes.
[5] Over-current
during deceleration
[6] Over-current
during constant
speed running
[10] Bus
undervoltage fault
Grid voltage is too low;
Overvoltage stall protection
is not enabled
Check grid input power;
Check the setting of related
function codes
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
Acceleration is too fast;
The motor in rotating is
restarted;
Grid voltage is too low;
Load is too large;
Power is too small;
Increase acceleration time;
Avoid restart after stop;
Check grid voltage;
Select the VFD with larger
power;
Select proper motor
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