Mitsubishi MELDAS MDS-C1 Instruction Manual page 267

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