Common Anomalies And Countermeasures - DEMA D5M Series Manual

NO.7 Maintenance and Fault Information
(2) DC braking during starting has been set, and it is required to increase DC braking value.
9. Vibration or roaring of the machine
(1) For resonance of vibration frequency of mechanical system and carrier wave, adjust
carrier wave to avoid resonance point.
(2) Resonance of vibration frequency of mechanical system and inverter output frequency.
a. Set skipping function to avoid the
resonance point;

7.5 Common anomalies and countermeasures

Analysis, judgment and countermeasures of common anomalies are shown in the table
below:
Anomaly
No keyboard
display
No keyboard
display while
charging indicator
inside is on
Motor
fails to No voltage or low
run voltage of DC+
and DC- terminals
Buzzing of motor
Anomaly not
found
80
b. Set rubber vibration insulator on bottom
board of the motor.
Possible causes and countermeasures
Inspect whether power failure occurs, input power is in
open-phase and input power is connected in error.
Test the connecting wire and socket relating to keyboard
are in good condition.
Measure the voltage of each control power supply inside to
confirm whether switching power supply is in normal
operation.
In case of abnormal operation of switching power supply,
inspect the socket of switching power incoming line (DC+,
DC-) is well connected, start-oscillation resistor is
damaged or voltage regulator tube is normal.
Inspect charging circuit.
Too big load of motor, try to reduce it.
Confirm whether it is in tripping state or reset is not
performed after tripping, whether it is in restarting state
after power failure, whether the keyboard is reset, whether
program operating state, operating state of multi-segment
speed, set operating state or non-operating state is
accessed; try restoring ex-factory value to confirm whether
operating instruction is provided and inspect whether
running frequency is set to 0.