3. TROUBLESHOOTING AND
RECOVERY PROCEDURES
B–65195EN/01
TROUBLESHOOTING AND RECOVERY
44
Notes
1 The IPM can detect the following alarms.
– Over-current
– Over-heat
– Drop in IPM control power voltage
2 When the control power is separated from the main power, if the circuit breaker of the servo
amplifier is off, low DC link voltage alarm (LVDC) is detected.
Type LED Action
Over-voltage alarm
(HV)
(1) The three-phase input voltage is probably higher than the rating. Check the
voltage and correct it as required.
(2) The connection of the separate regenerative discharge unit is probably incor
rect. Check the connection.
(3) The resistor of the separate regenerative discharge unit is probably defec
tive.Disconnect the wiring of the regenerative discharge unit and check the
resistance. If it is not within +20% of the rating (described in Section 3. 5),
replace the regenerative discharge unit.
If any of the above three items does not fit the case,replace the servo amplifier.
Low control power
voltage alarm (LV)
(1) The single-phase input voltage (for control circuit) is probably lower than the
rating. Check the voltage and correct it as required.
(2) The emergency stop input signal is probably short- circuited.
Remove the CX4 connector from the amplifier. If the alarm condition disap
pears,check the connection of the external cable.
(3) For the type B interface,the pulse coder is probably short- circuited.
Remove the JF* connector from the amplifier. If the alarm condition disap
pears,check the connection of the external cable.
If any of the above three items does not fit the case,replace the servo amplifier.
Low DC link voltage
alarm (LVDC)
(1) The circuit breaker is probably off. Check the circuit breaker.
(2) The three-phase input voltage is probably lower than the rating. Check the volt
age and correct it as required.
If either of the above two items does not fit the case, replace the servo am
plifier
Regenerative
discharge control circuit
failure alarm (DCSW)
(1) The connection of the separate regenerative discharge unit is probably incor
rect. Check the connection.
(2) The resistor of the separate regenerative discharge unit is probably defec
tive.Disconnect the wiring of the regenerative discharge unit and check the
resistance. If it is not within +20% of the rating (described in Section 3. 5),
replace the regenerative discharge unit.
If either of the above two items does not fit the case, replace the servo amplifier
3.1.2
Actions to be Taken on
Each Alarm