Specifications

Chapter 1 Outlines of the HA -655 driver
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1-9-2 Protective functions
The HA -655 driver provides the following alarms to protect the servo system, and presents an alarm
code on the preceding paragraph.
◆ Over speed (10)
If a motor exceeds its maximum speed or if motor rotates abnormally, the alarm occurs. To clear the
alarm, shut off the control power once and turn it on again.
◆ Over load (20)
The driver always monitors the motor current, and if the current exceeds the curve in the figure below,
the overload alarm occurs.
For example:
(1) The alarm occurs if the current
slightly exceeds 1.2 times of
nominal current for a long
duration.
(2) The alarm occurs if the current of
three times of the nominal current
flows for 20 seconds.
It is possible to clear the alarm by
inputting signal to [CN2-2 clear:
CLEAR].
◆ Overheat (21)
The alarm occurs by activating the thermal switch of an IPM element in the HA-655 driver. To clear the
alarm after troubleshooting, shut off the control power once and turn it on again.
◆ Over current (30)
The alarm occurs when the servo control element of the driver detects excessive current. To clear the
alarm after troubleshooting, shut off the control power once and turn it on again.
◆ Abnormal regeneration (41)
The alarm occurs by activating the thermal switch of the regeneration resistor in the HA-655 driver at
100℃. To clear the alarm after troubleshooting, shut off the control power once and turn it on again.
◆ Encoder failure (50)
The alarm occurs when the encoder signal ceases. To clear the alarm after troubleshooting, shut off the
control power once and turn it on again.
The alarm also occurs when a built-in battery of the HA-655 driver for the absolute encoder is taken off in
spite of normal conditions. To clear the alarm, shut off the control power once and turn it on again.
Nominal
current
Max. current
Actuator current
1000
100
10
1.2 times of
nominal current
Delay (s)
×
1
×
2
×
3
Over load range