B–65195EN/01
3. TROUBLESHOOTING AND
RECOVERY PROCEDURES
TROUBLESHOOTING AND RECOVERY
43
If an alarm condition related to the servo amplifier unit occurs, the
7-segment LED indicator on the amplifier front panel behaves as listed
below.
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 dis-
charge control circuit
failure alarm (DCSW)
This alarm occurs if :
– The short-time regenerative discharge energy is too high.
– The regenerative discharge circuit is abnormal.
Over-regenerative
discharge alarm
(DCOH)
This alarm occurs if :
– The average regenerative discharge energy is too high
(too frequent acceleration/deacceleration).
– The transformer overheats.
Dynamic brake circuit
failure alarm (DBRLY)
This alarm occurs if the relay contacts of the dynamic brake welds together.
L-axis over-current
alarm (HCL)
This alarm occurs if an abnormally high current flows in the L-axis motor.
M-axis over-current
alarm (HCM)
This alarm occurs if an abnormally high current flows in the M-axis motor.
L-and M-axis
over-current alarm
(HCM)
This alarm occurs if an abnormally high current flows in the L-and M-axes
motor.
L-axis IPM alarm
(IPML)
This alarm is detected by the IPM (intelligent power module) of the L-axis.
(Note 1)
M-axis IPM alarm
(IPML)
This alarm is detected by the IPM (intelligent power module) of the M- axis.
(Note 1)
L-and M-axis IPM
alarm (IPMLM)
This alarm is detected by the IPM (intelligent power module) of the L-and M-
axes. (Note 1)
Circuit breaker
Trips
The circuit breaker trips if an abnormally high current (exceeding the working
current of the circuit breaker) flows through it. Note 2)
3.1
SERVO AMPLIFIER
UNIT
3.1.1
LED Indications and
Meanings