Chapter 8
Protective functions
-
-
62
Regeneration failure
(Alarm clear: Impossible)
●
Description
This alarm occurs when an over power supply voltage is detected.
The only way to reset it is to examine the cause, and shut off and then turn on the power.
●
Possible causes
(1) If the alarm occurs during deceleration:
Cause 1: The ambient conditions of operation are severe.
⇒
Action: Recheck that the ambient conditions are not problematic in terms of the specifications.
(Increase the acceleration/deceleration time or quiescent time, if required)
Cause 2: Insufficient capacity of regeneration
⇒
Action: A regeneration unit needs to be added.
Refer to
“
Section 10-6, Regeneration unit
”
, and reconsider this action.
Overheat
(Alarm clear: Possible)
●
Description
This alarm occurs when the temperature of the HA-520 driver radiator plate exceeds the allowable
temperature (75
°
C).
After the temperature decreases below the operation detection temperature, reset the alarm or power on
the driver again.
●
Possible causes
(1) If the alarm occurs when the power is turned on:
Cause 1: HA-520 driver control circuit failure
⇒
Action: Contact a business office of Harmonic Drive System.
(Replacing the HA-520 driver)
(2) If the alarm occurs during operation (the operation can resume after a lapse of 4 to 5
min):
Cause 1: Overloaded operation
⇒
Action: Reconsider the effective duty ratio of the actuator to decrease it.
Cause 2: The ambient temperature of the HA-520 driver is higher than 50
°
C.
⇒
Action: Reconsider the actuator instruction location and the cooling system.
Pay sufficient attention to operation when rotating
the actuator from the load side.
●
If the driver is operated while the alarm is rotated from
the load side, the driver may burn.
Warning
