Mitsubishi Electric MELDAS MDS-B Series Instruction Manual page 176

Absolute position detection circuit error:
Alarm No.
An error was detected in the scale or scale side circuit of the absolute position linear
4A
scale connected to the MAIN side.
Investigation details
1 Check the alarm No. "49" items.
Incremental position detection circuit error:
Alarm No.
A speed exceeding the max. movement speed of the absolute position linear scale
4B
connected to the MAIN side was detected.
Investigation details
1 Check whether the machine was
operating when the alarm occurred.
2 Check whether the operation is normal
at low-speeds.
3 Wiggle the connectors by hand to check
whether the absolute position linear
scale connectors (unit side and scale
side) are disconnected.
4 Turn the power OFF, and check the
detector cable connection with a tester.
5 Connect to another normal axis unit,
and check whether the fault is on the
unit side or detector side.
6 Check if there is any abnormality in the
unit's ambient environment.
(Ex. Ambient temperature, noise,
grounding)
CAUTION
Chapter 11 Troubleshooting
Investigation results
Investigation results
The machine was operating.
The machine was not operating.
The machine was operating.
The machine was not operating.
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 absolute position
linear scale side.
No abnormality is found in particular.
An abnormality was found in the
ambient environment.
To prevent trouble, when changing the motor and driver combination, avoid
driving a driver with a larger capacity than the specified driver using the motor.
The motor could be demagnetized. Note that this combination can be used for
checking in the emergency stop state. The motor can be driven with a driver
with a capacity smaller than the specifications.
Investigate item 3.
Investigate item 2.
Investigate item 3.
Check the precautions for turning the
power ON.
• Wiring check
• Parameter check
Correctly install.
Investigate item 4.
Replace the detector cable.
Investigate item 5.
Replace the drive unit.
Investigate item 6.
Replace the motor (the absolute position
linear scale).
Take remedies according to the causes of
the abnormality.
Ex.
temperature ...
cooling
11–20
Alarm check timing
f1 f2
–
Remedies
Alarm check timing
f1 f2
–
Remedies
High
Check the
fan.
Incomplete grounding .... Additionally
ground.
f3 f4
f3 f4