Mitsubishi MELDAS MDS-C1 Instruction Manual page 269

C-axis changeover alarm
Alarm No.
When using the coil changeover control motor, the mode was changed to C-axis control while the
44
high-speed coil was selected.
Investigation details
1 Check the coil selected with the
spindle control input 3, bitD for the
C-axis control command.
2 Is coil changeover validated for the
special motor specifications?
Motor overheat
Alarm No.
The temperature protection function in the motor or detector activated.
46
Investigation details
1 Check the repeatability.
2 Check whether the drive unit
connectors (servo: CN3, spindle:
CN6) or detector connectors are
disconnected.
3 Using a tester, check whether the
detector cable is broken.
4 When using MDS-B-HR, is the motor
thermal validated even when it is not
provided?
5 Check the overload % (servo) or load
meter (spindle).
6 Is the unbalance torque high?
7 Was the overload alarm (50) forcibly
reset by turning the drive unit power
OFF?
8 Check the parameter settings.
9 Measure the motor temperature
when the alarm occurs.
10 When using a motor with fan, check
whether the fan is stopped, or
whether it is clogged with dust, etc.
11 Check the fan wiring.
12 Try replacing the drive unit.
NC command mode error
Alarm No.
A spindle control mode selection outside the specifications was input.
4E
Investigation details
1 Pinpoint where the alarm occurs in
the PLC program.
2 Does the alarm occur when position
control (C-axis, spindle
synchronization, synchronous tap) is
started?
6. Troubleshooting
Investigation results
High-speed coil is selected (bitD = 0) Correct the sequence.
Low-speed coil is selected (bitD= 1)
Coil changeover valid (SP034, bit2 =
1)
Coil changeover invalid (SP034, bit2
= 0)
Investigation results
The alarm occurs before operation.
The alarm occurs occasionally after
operation is started.
The connector is disconnected (or
loose).
The connector is not disconnected.
The cable is broken.
The cable is not broken.
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%.
The alarm was forcibly reset.
The alarm was not forcibly reset.
There was an incorrect setting.
The settings are correct.
Hot.
Not hot.
The fan motor was stopped.
The motor fan wind flow is poor.
There is no problem.
The cable is broken.
The cable is not broken.
Improved.
Not improved.
Investigation results
The alarm always occurs at the same
position.
The alarm occurs irregularly.
The alarm occurs during position
control.
The alarm occurs during speed
control.
6 - 24
Remedies
Investigate item 2.
Correctly set the parameter.
Replace the drive unit.
Remedies
Investigate item 2.
Investigate item 5.
Correctly install.
Investigate item 3.
Replace the cable.
Servo : Investigate item 4.
Spindle : Investigate item 12.
Set SP034, bit2 to 1.
Investigate item 12.
Servo : Investigate item 6.
Spindle : Investigate item 8.
Investigate item 9.
Select the motor so that the constant
load torque is 60% or less.
Investigate item 7.
Do not turn the drive unit's power
OFF when an overload alarm occurs.
(The NC power can be turned OFF.)
Investigate item 9.
Correctly set.
Investigate item 9.
Investigate item 10.
Investigate item 12.
Investigate item 11.
Clean.
Investigate item 12.
Replace the cable.
Replace the fan.
Replace the drive unit.
Replace the motor.
Remedies
Check the NC and PLC program
process.
Investigate item 2.
Check the NC and PLC program
process.
Check the NC and PLC program
process.
(If the cause cannot be pinpointed,
replace the drive unit, and confirm.)
SV SP
SV SP
SV SP