Mitsubishi Electric C70 Setup Manual page 588

Alarm No.
Motor overheat / Thermal error
46
Thermal protection function of the motor or in the detector, has started its operation.
Investigation details
Check the repeatability.
(Note) For the spindle, check the
1
"temperature" of the "spindle unit" displayed
on the drive monitor screen.
Jiggle the detector connectors (drive unit
2 side and detector side) and check if they are
disconnected.
Turn the power OFF, and check the detector
3
cable connection with a tester.
When using MDS-B-HR, check if the motor
4 is validated even if a motor thermal is not
provided?
Check the overload % (servo) or load meter
5
(spindle).
6 Is the unbalance torque high?
Was the overload alarm (50) forcibly reset
7
by turning the drive unit power OFF?
8 Check the parameter settings.
Measure the motor temperature when the
alarm occurs.
9 (Note) For the spindle motor, check the
"temperature" of the "spindle unit" shown on
the drive monitor screen.
When using a motor with fan, check whether
10 the fan is stopped, or it is clogged with dust,
etc.
11 Check the fan wiring.
Replace the drive unit or motor with another
12 drive unit or motor, and check whether the
fault is on the drive unit side or motor side
Check if there is any abnormality in the
unit's ambient environment.
13
(Ex. Ambient temperature, noise,
grounding)
Motor side detector: Error 5
Alarm No.
The motor side detector (linear scale in the case of linear motor) detected an error.
48
As details differ for each detector, refer to "Appendix 2.3.1" for the description of this alarm.
Investigation details
1 Check the alarm No. "1B" items.
Motor side detector: Error 6
Alarm No.
The motor side detector (linear scale in the case of linear motor) detected an error.
49
As details differ for each detector, refer to "Appendix 2.3.1" for the description of this alarm.
Investigation details
1 Check the alarm No. "1B" items.
Investigation results
[1] The alarm occurs before operation.
[2] The "temperature" displayed on the drive
monitor screen is different from ambient
temperature.
[1] The alarm occurs after the operation
continues for a while.
[2] The "temperature" displayed on the drive
monitor screen rises drastically during the
spindle operation.
The connector is disconnected (or loose).
The connector is not disconnected.
The connection is faulty.
The connection is normal.
SV034/bit2 = 0
SV034/bit2 = 1
The load is large.
The load is not large.
The constant load torque (friction +
unbalance) is 60% or more.
The constant load torque is less than 60%. Check the investigation item No. 7.
The alarm was forcibly reset.
The alarm was not forcibly reset.
The parameter is not set correctly.
The parameter is set correctly.
The motor unit is hot.
The motor is not hot.
The motor fan was stopped.
The motor fan wind flow is poor.
The direction of the ventilation is opposite.
There is no problem.
The cable is broken.
The cable is not broken.
The alarm is on the drive unit side.
The alarm is on the motor side.
Take remedies according to the causes of the abnormality in the ambient environment.
Investigation results
Investigation results
Appendix 2.16 Troubleshooting
Remedies
Check the investigation item No. 2.
Check the investigation item No. 5.
Correctly install.
Check the investigation item No. 3.
Replace the cable.
Check the investigation item No. 4.
Set SP034/bit2 to 1.
Check the investigation item No. 5.
Servo:
Check the investigation item No. 6.
Spindle:
Check the investigation item No. 8.
Check the investigation item No. 9.
Select the motor so that the constant load
torque is 60% or less.
Do not turn the drive unit's power OFF when
an overload alarm occurs. (The NC power
can be turned OFF.)
Check the investigation item No. 9.
Correctly set.
Check the investigation item No. 9.
Check the investigation item No. 10.
Check the investigation item No. 12.
Check the investigation item No. 11.
Clean the fan and ventilation holes inside of
the motor.
Change the connected phase sequence.
Check the investigation item No. 12.
Replace the cable.
Replace the fan.
Replace the drive unit.
Replace the motor.
Remedies
Remedies
C70 Setup Manual
SV SP
SV SP
SV SP
571