Poor  gain  adjustment 
results  in  motor 
vibration,  back  and 
forth  swing  and 
abnormal noise. 
Readjustment of gain parameters 
Driver  or  motor 
hardware failure; 
There  are  servo  cross  test  or 
motor empty shaft on site, F1-01 
trial operation, F1-00 jog run can 
not rotate uniformly; 
Replace the new driver or motor 
and  send  the  malfunction 
machine  back  to  the 
manufacturer for repair. 
Judging that the 
current motor 
output torque is 
greater than 
P3-28/P3-29 
(internal 
forward/reverse 
torque limit), and 
the time reaches 
P0-74 (unit ms), 
and the speed is 
lower than P0-75 
(unit 1 rpm). 
(1)  Machinery  is 
impacted,  suddenly 
becomes  heavier  and 
distorted; 
(2)  When  the  brake  of 
the  motor  is  not 
opened,  the  motor 
moves; 
(3)  The  parameter 
setting is unreasonable. 
(1)  Eliminate  the  factors  of 
mechanical  distortion.  Reduce 
load 
(2)  Measure  the  voltage  of  the 
brake terminal and determine the 
opening of the brake; 
It  is  suggested  to  use  servo  BK 
brake signal to control the brake 
lock.  If  it  is  not  servo  control, 
attention  must  be  paid  to  the 
timing  of  brake  opening  and 
motor action. 
(3)  Monitor  the  actual  output 
torque range of U0-02 and check 
whether  the  setting  of  P3-28/29 
torque limit is reasonable.  (After 
version  3760,  the  output  torque 
limit  setting  parameters  of  anti 
locked rotor alarm are P3-38 and 
P3-39) 
Regenerative 
resistance 
overload 
High  Voltage 
Fluctuation  in  Power 
Grid 
Selection  of 
regenerative  resistance 
is too small 
Replacement  of  higher  power 
regenerative  resistors  (refer  to 
chapter 1.4.1) 
Acceleration  and 
deceleration time is too 
short 
Extending  Acceleration  and 
Deceleration Time 
The  AC  gear  of  the  multimeter 
measures  the  input  value  of  the 
servo LN (R/S/T), which is 220V 
± 10% of the normal value. If the 
power  supply  voltage  is  more 
than  220V+10%  (380V+10%), 
check  the  power  supply  voltage; 
if  the  power  supply  voltage  is 
normal,  then  in  servo  BB  state, 
monitor  U0-05,  the  voltage 
measured  by  the  multimeter  * 
1.414  <  U0-05  (within  10V 
error),  then  the  servo  driver  is 
faulty and  needs to be  sent back 
for repair. 
Communication 
error  of  absolute 
Check if the motor matches 
correctly