6. Troubleshooting and check 
 
6-2 
 
Abnormal 
noise is 
generated. 
Check the screw condition 
of the coupling and copper 
core of the connection 
part etc. 
Check the bearing 
vibration and abnormal 
noise. 
Parameter mis-
setting(Motor/encoder 
ID, inertia ratio, gain, 
TC) 
Check the control 
parameter. 
Refer to parameter setting 
method in chapter 3. 
 
 
6.1.2.  Servo drive 
 
  When an alarm occurs in servo drive and error signal output contact point (ALARM) goes OFF 
and the motor is stopped by dynamic brake.   
Turn external ESTOP 
contact point input OFF. 
Check external DC 24V power. 
Check ESTOP contact point ON 
status 
Servo drive output terminal 
(U, V, W) short circuit, 
output over-current 
Check output terminal wiring, re-
operate after resetting, replace drive 
when O.C continues 
Input over-voltage   
(280V or above) 
Regenerated resistance 
burnt, Overload GD
2
 
Use input voltage of 230V or below 
Replace brake resistance, increase 
acceleration/deceleration time, 
replace servo drive 
Mechanical overload 
Motor mis-wiring 
Check load condition, check motor 
and encoder wiring 
Main power blocked when 
SERVO is ON 
Check 3 phase main power (R, S, T) 
input condition 
Mis-wiring of 
motor and 
encoder 
Motor and encoder related 
set value error, motor and 
encoder mis-wiring, 
encoder defect, 
mechanical overload 
Check motor, encoder, wiring and 
set value, remove overload 
Over-gain, parameter set 
value error, 
over gravity load 
Adjust gain 
Check parameter (P03-15, P03-16) 
Remove over gravity load