Fault Information And Fault Clearing - DEMA D5M Series Manual

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 Fault content and
display
Overcurrent during
Overcurrent during
constant speed
Overcurrent during
Overcurrent during
Earthing short circuit
Overvoltage during
Overvoltage during
Overvoltage during
constant speed
Overvoltage during
description
acceleration
deceleration
stop
stop
acceleration
deceleration
Fuse blowing
NO.7 Maintenance and Fault Information
Handling method
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.
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.
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.
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.
1: Extend deceleration time or install brake resistor;
2: Improve network voltage and inspect whether the
voltage with abrupt change emerges.
Fuse is blown, so send it to factory for overhaul.
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