Mitsubishi Electric MELDAS MDS-B Series Instruction Manual page 187

Pole shift warning:
Alarm No.
An error was detected in the pole shift amount set in servo parameter SV028.
9B
Investigation details
1 Check whether the MDS-B-MD system
is being used.
2 Check whether the warning occurred at
the first movement after setting the
servo parameter (SV028).
3 Carry out DC excitation again, and
check the servo parameter (SV028)
setting value.
4 Wiggle the connectors by hand to check
whether the MDS-B-HR connectors (unit
side, HR side and MD side) are
disconnected.
5 Turn the power OFF, and check the
connection of the detector cables
(between driver I/F units and between
I/F unit and pole detector) with a tester.
6 Connect with another normal axis unit
(or MDS-B-HR) and check whether the
fault is on the unit side or MDS-B-HR
(MDS-B-MD) side.
7 Check if there is any abnormality in the
unit's ambient environment.
(Ex. Ambient temperature, noise,
grounding)
HR unit pole warning:
Alarm No.
An error was detected in the pole position data of the MDS-B-HR connected to the
9C
MAIN side after passing the Z phase.
Investigation details
1 Check the alarm No. "86" items.
HR unit pole warning (SUB):
Alarm No.
An error was detected in the pole position data of the MDS-B-HR connected to the
9D
SUB side after passing the Z phase.
Investigation details
1 Check the alarm No. "86" items.
Chapter 11 Troubleshooting
Investigation results
The system is not MDS-B-MD.
The system is MDS-B-MD.
Movement is possible several times
without a warning.
The warning occurred at the first
movement.
The SV028 setting value is the same
with the previous and current DC
excitation.
The SV028 setting value is different with
the previous and current DC excitation.
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 unit side.
The alarm is on the MDS-B-HR
(MDS-B-MD) side.
No abnormality is found in particular.
An abnormality was found in the
ambient environment.
Investigation results
Investigation results
11–31
Alarm check timing
f1 f2
– –
Remedies
Investigate item 4.
Investigate item 2.
Investigate item 4.
Investigate item 3.
Investigate item 4.
Set SV028 to the current DC excitation
value.
↓
If the problem is not resolved, check
investigation item 4.
Correctly install.
Investigate item 5.
Replace the communication cable.
Investigate item 6.
Replace the drive unit.
Investigate item 7.
Replace MDS-B-HR (linear scale or
MDS-B-MD).
Take remedies according to the causes of
the abnormality.
Ex. High
temperature ... Check the
cooling
fan.
Incomplete grounding .... Additionally
Alarm check timing
f1 f2
–
Remedies
Alarm check timing
f1 f2
–
Remedies
f3 f4
–
ground.
f3 f4
f3 f4