Mitsubishi MELDAS MDS-C1 Instruction Manual page 260

Machine side detector, No signal 2
Alarm No.
The pulse-type linear scale or ball screw end detector's ABZ-phase no signal was detected with the
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servo, or the encoder no-signal was detected with the spindle.
Investigation details
1 Check the servo parameter (SV025.
pen) setting value.
Are the pulse-type detector
parameters set for a serial
communication type detector?
2 Check the spindle parameter (SP037,
bit0) settings.
3 Check whether the drive unit
connectors (servo: CN3, spindle:
CN6) or detector connectors are
disconnected.
4 Turn the power OFF, and check the
detector cable connection with a
tester.
5 Connect to another normal axis drive
unit, and check whether the fault is
on the drive unit side or detector side.
6 Check if there is any abnormality in
the detector's ambient environment.
(Ex. Ambient temperature, noise,
grounding)
Excessive speed deflection 1
Alarm No.
A difference of 50r/min or more between the speed command and speed feedback continued for longer
23
than the set time.
Investigation details
1 Check the U, V and W wiring
between the spindle drive unit and
spindle motor.
2 Check the settings for SP034,
SP040, SP055, and SP257 to
SP384.
3 Measure the acceleration/
deceleration time constants.
Measure the time required to reach
the reverse run maximum speed from
the forward run maximum speed.
4 Measure the load during cutting.
5 Check the PLG output waveform.
6. Troubleshooting
Investigation results
The value is not set correctly.
The value is set correctly.
Encoder orientation is not used.
Encoder orientation is used.
The connector is disconnected (or
loose).
The connector is not disconnected.
There is a connection fault.
The connection is normal.
The alarm is on the drive unit side.
The alarm is on the detector side.
No abnormality is found in particular.
An abnormality was found in the
ambient environment.
Investigation results
The wires are not correctly
connected.
The wires are correctly connected.
The correct values are not set.
The correct values are set.
12sec or more.
Less than 12sec.
120% or more.
Less than 120%.
There is a problem.
Normal.
6 - 15
Remedies
Correctly set SV025.
Investigate item 3.
Set SP037, bit0 to 0.
Investigate item 3.
Correctly install.
Investigate item 4.
Replace the detector cable.
Investigate item 5.
Replace the drive unit.
Investigate item 6.
Replace the detector.
(With the absolute position system,
the zero point must be established.)
Take remedies according to the
causes of the abnormality.
Ex. High temperature:
Check the cooling fan.
Incomplete grounding:
Additionally ground.
Remedies
Correctly connect.
Investigate item 2.
Correctly set.
Investigate item 3.
Increase the SP055 setting value.
Investigate item 4.
Reduce the load.
Investigate item 5.
Adjust the PLG output waveform.
Replace the drive unit.
SV SP
SV SP