Voltage  instability  or 
chip abnormality 
Please  contact  the  agent  or  the 
manufacturer 
Bus voltage 
U0-05 is higher 
than the actual 
preset threshold, 
220V Power 
Supply Machine 
(U0-05≥402V) 
High  voltage  of  power 
grid 
Check  the  fluctuation  of  power 
grid, 220V driver normal voltage 
range 200V ~ 240V, 380V driver 
normal  voltage  range  360V  ~ 
420V.  If  the  voltage  fluctuation 
is large, it is recommended to use 
the  correct  voltage  source  and 
regulator. 
Excessive load moment 
of  inertia  (insufficient 
regeneration capacity) 
(1) connect external regenerative 
resistor, (220V: bus voltage 
U0-05 = 392 discharge starts, 
U-05 = 377 discharge ends; 
380V: U-05 = 750 discharge 
starts, U-05 = 720 discharge 
ends;) 
(2) Increasing Acceleration and 
Deceleration Time 
(3) Reducing load inertia 
(4) Reduce start-stop frequency 
(5) Replacement of larger power 
drivers and motors 
Brake  resistance 
damage  or  excessive 
resistance value 
Check  the  regenerative  resistor 
and  replace  the  external  resistor 
with  the  appropriate  resistance 
value.  See  chapter  1.4.1  for  the 
selection of the external resistor. 
Acceleration  and 
deceleration time is too 
short 
Extending  Acceleration  and 
Deceleration Time 
Hardware  Fault  of 
Driver  Internal 
Sampling Circuit 
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 the 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. 
Bus  voltage 
U0-05  is  lower 
than  the  actual 
preset threshold. 
220V  power 
supply  machine 
(U0-05 ≤ 150V) 
 
low  voltage  of  power 
grid  when  normal 
power on 
(1)  Check  the  fluctuation  of 
power  grid.  The  normal  voltage 
range  of  220V  driver  is 
200V~240V.  If  the  voltage 
fluctuation  is  large,  the  voltage 
regulator is recommended. 
(2)  Replacement  of  larger 
capacity transformers 
Instantaneous  power 
failure 
Re-energize  after  voltage 
stabilization 
Hardware  Fault  of 
Driver  Internal 
Sampling Circuit 
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 <