Mitsubishi MELDAS MDS-C1 Instruction Manual page 274

Speed monitor/ input mismatch
Alarm No.
In respect to the door status signal for speed monitor control, a mismatch of the external input signal
5D
and control signal received from the NC was detected.
Investigation details
1 Check the occurrence frequency.
2 Check the external input signal
waveform and NC reception control
signal.
3 Wiggle the drive unit connector (CN9)
by hand to check whether it is
disconnected.
4 Check whether the cable is broken.
5 Check if there is any abnormality in
the unit's ambient environment.
(Ex. Ambient temperature, noise,
grounding)
Speed monitor/ feedback error
Alarm No.
During speed monitor control, the spindle speed exceeded the set speed while the door was open.
5E
Investigation details
1 Check the alarm No. "5D" items.
Instantaneous power failure
Alarm No.
A drop in the 24VDC power was detected.
60
Investigation details
1 Is 24VDC applied on the CN22
connector?
Is the voltage low, or does it drop
sometimes?
2 Are the LEDs on the CR unit ON?
3 Check the wiring and power voltage.
4 Check whether the voltage is
dropping because of another load.
6. Troubleshooting
Investigation results
The alarm occurs each time.
The alarm occurs occasionally.
No particular abnormalities are
apparent.
A waveform error (external input
signal does not change, etc.), or a
signal error was found.
The connector is disconnected (or
loose).
The connector is not disconnected.
The cable is broken.
The cable is not broken.
No abnormality is found in particular.
An abnormality was found in the
ambient environment.
Investigation results
Investigation results
The voltage is not applied.
The voltage is 20.4VDC or less.
The voltage drops below 20.4VDC
sometimes.
The voltage is correctly applied.
The LEDs are not ON.
The LEDs are ON.
The power is abnormal.
The wiring or connectors are
abnormal.
A voltage drop is not observed.
A voltage drop is observed.
6 - 29
Remedies
Investigate item 2.
Investigate item 3.
Investigate item 3.
Remedy according to the cause.
Correctly connect.
Investigate item 4.
Replace the cable.
Investigate item 5.
Replace the drive unit.
Take remedies according to the
causes of the abnormality.
Ex. High temperature:
Check the cooling fan.
Incomplete grounding:
Additionally ground.
Remedies
Remedies
Investigate item 3.
Increase the power voltage.
Investigate item 4.
Investigate item 2.
Replace the unit.
Investigate item 4.
Replace the power.
Replace the cable.
Check the wiring.
Increase the power capacity.
SV SP
SV SP
CV CR