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Chapter 7 Common Problems, Anomalies and Troubleshooting
Chapter 7 Common Problems, Anomalies and Troubleshooting
Motor overload
External
equipment
failure
COM
communication
error
Remain
Current
detection error
Panel
communication
failure
CPU error
Error
Codes
Error Name
Probable Cause(s) Solution(s)
OL-2
EF
CE-1
CE-2
CE-3
CE-4
CPU
Over torque lifting or
improper V/F curve;
Power grid voltage below
level;
Motor stalled or
excessive load fluctuation;
Improper setting of the
motor's overload protection
coefficient.
Reduce torque lifting value
or regulate V/F curve.
Check power grid voltage.
Check loads and motor's
status.
Set proper overload
protection coefficient F9.00 of
the motor.
Close of fault input terminal
of external equipment.
Disconnect fault input
terminal of external
equipment and clear failure.
Improper setting of baud rate;
Communication failure due to
interference at serial port;
No communication signal of
the upper machine.
Adjust baud rate.
Check the communication cable
and take anti-interference measures.
Check if the upper machine runs
normally and the communication
cable is disconnected.
Damaged hall elements or
circuit failure;
DC accessory power
supply failure.
Seek service.
Seek service.
Circuit failure of patch
panel and control panel;
Loose connection of
terminals.
Seek service.
Check and re-connect.
Seek service.
7.2 Anomalies and Solutions
Table 7-2 Anomalies and Solutions
Anomalies Solutions
No display when
the power is ON;
Power trip;
Motor doesn't run;
Motor reverses;
Motor acceleration
/deceleration failed;
Motor's speed
fluctuates while at
constant speed.
Power grid voltage below
level or open phase;
DC accessory power supply
failure;
Charging resistor damaged.
Check power grid voltage.
Seek service.
Seek service.
Short circuit in the inverter's
input side;
Exiguous air switching
capacity.
Check wiring or seek service.
Expand air switching capacity.
Incorrect wiring;
Error setting of
operation mode;
Overload or motor
stalled.
Check wiring.
Reset the operation mode.
Reduce loads or regulate
motor's status.
Error phase sequence of
motor wiring.
Swap random two phases of
the output terminals U, V and W.
Improper setting of
acceleration/deceleration
time;
Under setting of over-
current stall points;
Over-voltage stall
prevention enabled;
Improper setting of
carrier frequency or
oscillation occurred;
Overload.
Reset
acceleration/deceleration time.
Increase setting value for
over-current stall point.
Extend deceleration time or
reduce load inertia.
Reduce carrier frequency.
Reduce load or replace an
inverter with higher power level.
Excessive fluctuation of
loads;
Under setting of motor's
overload protection
coefficient;
Loose contact of
frequency setting
potentiometer.
Reduce load fluctuation.
Increase overload
protection coefficient.
Replace the potentiometer
or seek service.