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10. Troubleshooting
10 - 4
10-3 List of unit protection functions
10-3-1 List of alarms
When an alarm occurs, the servo drive unit will make the motor stop by the deceleration control or
dynamic brake. The spindle drive unit will coast to a stop or will decelerate to a stop. At the same time,
the alarm No. will appear on the NC monitor screen and with the LEDs on the front of the drive unit.
Check the alarm No., and remove the cause of the alarm by following this list.
No. Alarm name Alarm details Stopping method Reset
10 Insufficient voltage Insufficient PN bus voltage was detected in main circuit. Dynamic brakes
PR
11 Axis selection error Setting of the axis No. selection switch is incorrect. Initial error
AR
12 Memory error 1 A CPU error or an internal memory error was detected during
the power ON self-check.
Initial error
AR
13 Software processing error 1 Software processing has not finished within the specified time. Dynamic brakes
PR
14 Software processing error 2 Software processing has not finished within the specified time. Dynamic brakes
PR
17 A/D converter error An error was detected in the A/D converter for detecting current
FB.
Dynamic brakes
PR
18 Motor side detector:
Initial communication error
Initial communication with the motor side detector failed. Initial error
PR
21 No signal 2 In the full-closed loop system, an error was detected in ABZ
phase.
Dynamic brakes
PR
24 Grounding The motor power cable is in contact with FG (Frame Ground).
PR
25 Absolute position data lost The absolute position was lost, as the backup battery voltage
dropped in the absolute position detector.
Initial error
AR
26 Unused axis error A power module error occurred in the axis whose axis No.
selection switch was set to "F"(free axis).
Dynamic brakes
PR
2B Motor side detector:
CPU error 1
An CPU initial error was detected in the motor side detector. Initial error
PR
2C Motor side detector:
EEPROM/LED error
The LED deterioration was detected in the motor side detector. Dynamic brakes
PR
2D Motor side detector:
Data error
A data error was detected in the motor side detector. Dynamic brakes
PR
2F Motor side detector:
Communication error
An error was detected in communication with the motor side
detector. Or, the communication was interrupted.
Dynamic brakes
PR
30 Over regeneration Over-regeneration detection level became over 100%. The
regenerative resistor is overloaded.
Dynamic brakes
PR
31 Overspeed The motor was detected to rotate at a speed exceeding the
allowable speed.
Dynamic brakes
PR
32 Power module overcurrent Overcurrent protection function in the power module has started
its operation.
Dynamic brakes
PR
33 Overvoltage PN bus voltage in main circuit exceeded the allowable value. Dynamic brakes
PR
34 NC-DRV communication:
CRC error
An error was detected in the data received from the CNC.
Deceleration control PR
35 NC command error The travel command data that was received from the CNC was
excessive.
Deceleration control PR
36 NC-DRV communication:
Communication error
The communication with the CNC was interrupted.
Deceleration control PR
37 Initial parameter error An incorrect parameter was detected among the parameters
received from the CNC at the power ON.
Initial error
PR
38 NC-DRV communication:
Protocol error 1
An error was detected in the communication frames received
from the CNC.
Deceleration control
PR
39 NC-DRV communication:
Protocol error 2
An error was detected in the axis information data received from
the CNC.
Deceleration control
PR
3A Overcurrent Excessive current was detected in the motor drive current. Dynamic brakes
PR
3B Power module overheat Thermal protection function in the power module has started its
operation.
Dynamic brakes
PR
3C Regeneration circuit error An error was detected in the regenerative transistor or in the
regenerative resistor.
Dynamic brakes
AR
3D Power supply voltage error at
acceleration/deceleration
A motor control error, due to an input voltage failure, was
detected.
Dynamic brakes
PR
3E Magnetic pole position
detection error
The magnetic pole position, detected in the magnetic pole
position detection control, is not reliable.
Dynamic brakes
AR