
3. SPECIFICATION
B–65192EN/02
12
The servo amplifier has a protection and error detection function. The
detected alarm conditions are indicated by the 7–segment LED on the
front of the servo amplifier.
If an alarm occurs, the motor is forced to stop by a dynamic brake.
Table 3.2 Protection and Error Detection Function (1/2)
Type
LED indication Description
Over–voltage
alarm (HV)
This alarm occurs if the DC voltage of
the main circuit power supply is abnor-
mally high.
Low control
power voltage
alarm (LV)
This alarm occurs if the control power
voltage is abnormally low.
Low DC link
voltage
alarm (LVDC)
This alarm occurs if the DC voltage of
the main circuit power supply is abnor-
mally low or the circuit breaker trips.
Regenerative
discharge con-
trol
circuit failure
alarm (DCSW)
This alarm occurs if:
–The short–time regenerative dis
charge energy is too high.
–The regenerative discharge circuit is
abnormal.
Over-regenera-
tive
discharge
alarm (DCOH)
This alarm occurs if:
–The average regenerative discharge
energy is too high
(too frequent acceleration/decelera
tion).
–The transformer overheats.
(See 9.3.8)
Dynamic brake
circuit failure
alarm (DBRLY)
This alarm occurs if the relay contacts
of the dynamic brake welds together.
3.2
PROTECTION AND
ERROR DETECTION
FUNCTION