6. Troubleshooting
6 - 22
Alarm No.
3E
Spindle speed overrun
1. A state in which the motor's speed feedback exceeded the speed command and accelerated was
detected.
2. Even though the speed command is 0 (including when stopped during position control), motor
rotation exceeding the parameter setting value was detected.
Investigation details Investigation results Remedies SV SP
Occurs immediately after power is
turned ON.
Investigate item 2. 1 Does the alarm occur immediately
after the power is turned ON?
Occurs after normal operation. Investigate item 3.
{
The connections are incorrect. Connect correctly. 2 Check the motor power cable (U, V,
W phases). (Also check the operation
immediately after emergency stop is
cancelled.)
• The power cable is not connected.
• Is the cable connected to the motor
for another axis?
• Is the contactor between the drive
unit and motor OFF?
(When using coil changeover
specifications.)
The connections are correct. Investigate item 3.
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Locked with a mechanical lock. Remove the cause of the lock. 3 Check whether the spindle rotary
section is locked with a mechanical
lock (C-axis clamp, etc.).
Not locked with a mechanical lock. Investigate item 4.
{
Improved. Replace the drive unit. 4 Try replacing the drive unit.
Not improved. Investigate the motor.
(Check the motor type and
parameters.)
{
Alarm No.
3F
Speed excessive deflection 2
During constant speed operation, the difference between the speed command and speed feedback
exceeded the set amount and set time.
Investigation details Investigation results Remedies SV SP
The cutting load is large. Lower the cutting load. 1 Check the load value with the spindle
monitor, and investigate the
machine's load state.
The cutting load is not large. Investigate item 2.
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Locked with a mechanical lock. Remove the cause of the lock. 2 Check whether the spindle rotary
section is locked with a mechanical
lock (C-axis clamp, etc.).
Not locked with a mechanical lock. Investigate item 3.
{
Improved. Replace the drive unit. 3 Try replacing the drive unit.
Not improved. Investigate the motor.
(Check the motor type and
parameters.)
{
Alarm No.
40
Detector changeover unit, changeover error
During 1-drive unit 2-motor control, an error was detected in the motor changeover signal received form
the detector changeover unit.
Investigation details Investigation results Remedies SV SP
The connector is disconnected (or
loose).
Correctly install. 1 Wiggle the FR-TK unit connector by
hand to check whether it is
disconnected.
The connector is not disconnected. Investigate item 2.
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The cable is broken. Replace the cable. 2 Check whether the cable connected
between the spindle drive unit and
FR-TK unit is broken.
The cable is not broken. Investigate item 3.
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No abnormality is found in particular. Replace the drive unit. 3 Check if there is any abnormality in
the unit's ambient environment.
(Ex. Ambient temperature, noise,
grounding)
An abnormality was found in the
ambient environment.
Take remedies according to the
causes of the abnormality.
Ex. High temperature:
Check the cooling fan.
Incomplete grounding:
Additionally ground.
{
Alarm No.
41
Detector changeover unit, communication error
During 1-drive unit 2-motor control, an error was detected in the communication with the detector
changeover unit.
Investigation details Investigation results Remedies SV SP
1 Check the alarm No. "40" items.
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