Product specifications

Chapter 7 Troubleshooting
HA-680_V04
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Chapter 7 Troubleshooting
7-1 Alarms and diagnostic tips
The HA-680 drivers provide various functions to protect actuators and drivers against abnormal
operating conditions. When these protection functions trip, driving of the actuator is stopped (the motor
becomes servo-off), and the display LED blinks at 0.5-second intervals. (It illuminates in green and
blinks in red: The number of times it blinks varies depending on the alarm. See below.)
If two or more alarms occur, only the latest alarm is displayed. Up to 8 latest alarms are recorded.
Recorded alarms can be checked with “Alarm History” of dedicated communication software PSF-520.
Alarm code Description
No. of times
LED blinks
Releasing
Overload Electronic thermal detected an overload state. 1 Available *1
Deviation counter
overflow
The value of the deviation counter exceeded the parameter
setting value.
2 Available *1
Encoder break detection The encoder line was broken. 3 Not available *2
Serial encoder data could not be received 10 times in a row. 4
Encoder reception error
Serial encoder data could not be received over an extended time
period, and encoder monitor could not be outputted
successfully.
5
Not available *2
UVW error All UVW signals of the encoder became the same level. 6 Not available *2
Regenerative error The main circuit voltage detection circuit detected overvoltage. 7 Not available *2
Operating temperature
error
The temperature of the HA-680 main unit tripped the
temperature rise sensor.
8 Not available *2
System error An error of the current detection circuit was detected. 9 Not available *2
Overcurrent The current detection circuit detected excessive current. 10 Not available *2
Load short circuit Excessive current flowed through the FET. 11 Not available *2
Memory error Read/write of EEPROM failed. 12 Not available *2
Overspeed
The motor axis speed exceeded the maximum rotation speed
+100 rpm for 0.5 s or longer.
13 Not available *2
*1 The servo does not turn on unless the S-ON signal is entered again after the alarm is cleared with the
CLR signal.
*2 Turn off the power after handling the alarm. After that, turn on the power again by following the power
on sequence.
The following example illustrates how the LED blinks in case of an alarm.
0.5s 0.5s 0.5s 2s 0.5s 0.5 s 0.5s
In the above example, the LED blinks 4 times at 0.5-s intervals, which indicates an “encoder reception
error.”