NO.7 Maintenance and Fault Information
77
7.3 Fault information and fault clearing
Inverters of D5M feature more perfect protection function in terms of overload, interphase
short circuit, earthing short circuit, undervoltage, overheating and overcurrent, etc. In case of
occurrence of inverter protection, ascertain the cause as per the information shown below.
After handling, perform the running operation newly; if incapable of handling, please contact
local dealer.
Fault
display
Fault content and
description
Handling method
Overcurrent during
acceleration
1: Inspect whether the motor is in short circuit/
partial short circuit and the insulation of output line is
in good condition;
2: Extend acceleration time;
3: Unreasonable inverter configuration, increase the
capacity of inverter;
4: Reduce the torque and increase set value.
Overcurrent during
constant speed
1: Inspect whether the motor is in short circuit and
the insulation of output connecting line is poor;
2: Inspect whether the motor is locked and
mechanical load changes abruptly;
3: Whether the capacity of inverter is too small, if
yes, increase the capacity of inverter;
4: Whether network voltage changes abruptly.
Overcurrent during
deceleration
Overcurrent during
stop
1: Whether the insulation of output connecting line is
in good condition and the motor is in short circuit;
2: Extend deceleration time;
3: Apply the inverter with larger capacity;
4: DC braking amount is too large, so reduce it;
5: Machine fault, send it to the factory for
maintenance.
Earthing short circuit
1: Inspect whether motor connecting line is in short
circuit;
2: Inspect whether the insulation of output line is in
good condition;
3: Send for repair.
Overvoltage during
stop
Overvoltage during
acceleration
Overvoltage during
constant speed
Overvoltage during
deceleration
1: Extend deceleration time or install brake resistor;
2: Improve network voltage and inspect whether the
voltage with abrupt change emerges.
Fuse blowing
Fuse is blown, so send it to factory for overhaul.
