Mitsubishi MELDAS MDS-C1 Instruction Manual page 259

Machine side detector, communication error
Alarm No.
An error was detected in the communication data with the linear scale or ball screw end detector. Or,
1F
the communication was cut off.
Investigation details
1 Check whether the drive unit
connectors (CN3) or detector
connectors are disconnected.
2 Is the detector cable wired in the
same conduit as the motor's power
cable or are the two cables laid in
parallel near each other?
3 Is the motor FG wire connected only
to the drive unit which drives it?
(Is the motor grounded to one point?)
4 Turn the power OFF, and check the
detector cable connection with a
tester. (Is the cable shielded?)
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)
Motor side detector, No signal 1
Alarm No.
A PLG Z-phase no signal was detected.
20
An error was detected in the A/B phase output waveform during PLG automatic adjustment.
Investigation details
1 Check whether the drive unit
connectors (CN5) or detector
connectors are disconnected.
2 Turn the power OFF, and check the
detector cable connection with a
tester.
3 Check whether the alarm occurred
during PLG automatic adjustment.
4 Check the PLG output waveform (A/B
phase).
5 Check the PLG output waveform
(Z-phase).
6 Check the occurrence frequency.
7 Check if there is any abnormality in
the unit's ambient environment.
(Ex. Ambient temperature, noise,
grounding)
6. Troubleshooting
Investigation results
The connector is disconnected (or
loose).
The connector is not disconnected.
The cables are wired near each
other. (Noise is entering from the
power cable.)
The wires are sufficiently separated.
The motor FG wire is grounded on
the motor side.
The motor is grounded to one point.
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 connector is disconnected (or
loose).
The connector is not disconnected.
There is a connection fault.
The connection is normal.
The alarm occurred during PLG
automatic adjustment.
The alarm occurred during normal
operation.
There is a problem. (The A/B phase
input voltage is 0.8V or less or 2.2V
or higher.)
Normal
There is a problem. (The output
waveform is 0V even after the gears'
Z-phase is passed.)
Normal
Occurs each time.
Occurs occasionally.
No abnormality is found in particular.
An abnormality was found in the
ambient environment.
6 - 14
Remedies
Correctly install.
Investigate item 2.
Improve the cable wiring.
Investigate item 3.
Ground the motor to one point,
connecting the wires together on the
drive unit side.
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 install.
Investigate item 2.
Replace the detector cable.
Investigate item 3.
Investigate item 4.
Investigate item 5.
Adjust the PLG output waveform.
Investigate item 6.
Investigate item 7.
Investigate item 6.
Replace the drive unit.
Check whether the cable is
disconnected, whether there is a
contact fault, or a detector fault.
Replace the PLG detector.
Take measures according to the error
cause.
Cable disconnection, contact fault.
The sensor is hot during high-load
operation.
Review the operation, and adjust
the Z-phase again.
SV SP
SV SP