Code Number 1 ~
Status Code / Error Code List Rev.4 5
No. Message Remedy Note 1 Note 2
520
DC input voltage for the CPU board is
lower than or bigger than the allowed
If normal voltage is not generated by a
DC power supply alone, replace the
100 times of
current value
100 times of
boundary
521
DU1 3.3V input voltage for the board is
lower than the allowed voltage.
If normal voltage is not generated by
3.3V of Drive Unit 1 power supply
alone, replace the power supply.
100 times of
current value
100 times of
boundary
522
DU1 5V input voltage for the board is
lower than the allowed voltage.
If normal voltage is not generated by
5V of Drive Unit 1 power supply alone,
replace the power supply.
100 times of
current value
100 times of
boundary
523
DU1 24 V input voltage for the motor
brake, encoder and fan is lower than
If normal voltage is not generated by
24V of Drive Unit 1 power supply
alone, replace the power supply.
100 times of
current value
100 times of
boundary
524
DU1 Internal temperature of the
Controller is higher than the allowed
temperature.
Stop Drive Unit 1 as soon as possible
and check whether the ambient
temperature of Drive Unit 1 is not high.
Check whether the filter is not clogged
100 times of
current value
100 times of
boundary
value
525
DU1 Rotating speed of the controller
fan is below the allowed speed. (FAN1)
Check whether the filter of Drive Unit 1
is not clogged up. If the warning is not
cleared after the controller is rebooted,
Current value
Boundary
value
526
DU1 Rotating speed of the controller
fan is below the allowed speed. (FAN2)
Check whether the filter of Drive Unit 1
is not clogged up. If the warning is not
cleared after the controller is rebooted,
Current value
Boundary
value
531
DU2 3.3V input voltage for the board is
lower than the allowed voltage.
If normal voltage is not generated by
3.3V of Drive Unit 2 power supply
alone, replace the power supply.
100 times of
current value
100 times of
boundary
532
DU2 5V input voltage for the board is
lower than the allowed voltage.
If normal voltage is not generated by
5V of Drive Unit 2 power supply alone,
replace the power supply.
100 times of
current value
100 times of
boundary
533
DU2 24 V input voltage for the motor
brake, encoder and fan is lower than
If normal voltage is not generated by
24V of Drive Unit 2 power supply
alone, replace the power supply.
100 times of
current value
100 times of
boundary
534
DU2 Internal temperature of the
Controller is higher than the allowed
temperature.
Stop Drive Unit 2 as soon as possible
and check whether the ambient
temperature of Drive Unit 2 is not high.
Check whether the filter is not clogged
100 times of
current value
100 times of
boundary
value
535
DU2 Rotating speed of the controller
fan is below the allowed speed. (FAN1)
Check whether the filter of Drive Unit 2
is not clogged up. If the warning is not
cleared after the controller is rebooted,
Current value
Boundary
value
536
DU2 Rotating speed of the controller
fan is below the allowed speed. (FAN2)
Check whether the filter of Drive Unit 2
is not clogged up. If the warning is not
cleared after the controller is rebooted,
Current value
Boundary
value
541
DU3 3.3V input voltage for the board is
lower than the allowed voltage.
If normal voltage is not generated by
3.3V of Drive Unit 3 power supply
alone, replace the power supply.
100 times of
current
100 times of
boundary
542
DU3 5V input voltage for the board is
lower than the allowed voltage.
If normal voltage is not generated by
5V of Drive Unit 3 power supply alone,
replace the power supply.
100 times of
current
100 times of
boundary
543
DU3 24 V input voltage for the motor
brake, encoder and fan is lower than
If normal voltage is not generated by
24V of Drive Unit 3 power supply
alone, replace the power supply.
100 times of
current
100 times of
boundary