
8. ALARM LIST
541
No. CountermeasureDescription
LED
display
A DC link overvoltage alarm
is issued.
This alarm is issued when
the DC voltage of the main
circuit power is too high.
413
(1) When SVU–12 or SVU–20 is used, and a separate re-
generative discharge unit is not used, check the specifi-
cation to see if regenerative energy per one time does
not exceed the allowable regenerative energy of the
servo amplifier unit.
(2) For the SVU–40 and the SVU–80, when the separate re-
generative discharge resistor is not used, check wheth-
er the CX23 connector is short–circuited with a dummy
connector.
(3) The supply voltage for dynamic power may exceed the
rated value. Check the voltage. If the voltage is too high,
reduce the voltage to an appropriate level.
(4) The regenerative discharge unit may not be properly
connected. Check the connection.
(5) The resistance of the separate regenerative discharge
unit may be abnormal. Disconnect the separate regen-
erative discharge unit, then check the resistance. If the
resistance is not within ±20% of the predetermined
resistance, replace the separate regenerative dis-
charge unit.
(6) If (1) to (5) are not the cause of the alarm, replace the
servo amplifier unit.
A DC link low voltage alarm
is issued.
This alarm is issued when
the DC voltage of the main
circuit power is too low.
414
(1) 190 ms or longer may pass from the time when both the
*ESP of the built–in DI and the *ESP of the I/O link inter-
face signal are canceled until the external magnetic
contactor inserted into the input for motive power turns
on(including the operating time of the magnetic contac-
tor). The magnetic contactor must turn on within 100
ms.
(2) The external circuit breaker may be turned off. Check
the circuit breaker.
(3) The supply voltage for dynamic power is lower than the
rated value. Check the voltage. If the voltage is too low,
increase it to an appropriate level.
(4) The external magnetic contactor may not be connected
properly. Check the connection.
If (1) to (4) are not the cause of the alarm, replace the servo
amplifier unit.