Mitsubishi MELDAS MDS-C1 Instruction Manual page 276

Auxiliary regeneration error
Alarm No.
The auxiliary regenerative transistor is still ON.
63
Investigation details
1 Check whether the regenerative
resistor on the back of the unit is dirty.
2 Using a tester, check the continuity of
the terminal block and resistor
surface.
Rush relay error
Alarm No.
The rush resistance short-circuit relay does not turn ON.
65
Investigation details
1 Check the repeatability.
2 Check if there is any abnormality in
the unit's ambient environment.
(Ex. Noise, grounding)
Phase failure
Alarm No.
There is a phase failure in the input power.
67
Investigation details
1 Check the voltage for each input
phase.
2 Check the alarm No. "71" items.
Watch dog
Alarm No.
The system is not operating normally.
68
Investigation details
1 Check the repeatability.
2 Check if there is any abnormality in
the unit's ambient environment.
(Ex. Noise, grounding)
6. Troubleshooting
Investigation results
Cutting oil or oil mist is adhered on
the regenerative resistor.
The resistor is not dirty.
There is continuity.
The resistance value is ∞.
Investigation results
The alarm occurs each time READY
is turned ON.
The alarm occurs occasionally.
No abnormality is found in particular.
The grounding is incomplete.
An alarm will occur easily if another
device operates.
Investigation results
There are phases with no voltage.
There is no problem.
Investigation results
The alarm occurs each time READY
is turned ON.
The alarm occurs occasionally.
No abnormality is found in particular.
The grounding is incomplete.
An alarm will occur easily if another
device operates.
6 - 31
Remedies
Take measure to prevent cutting oil
and dust from getting on the fins at
the back of the unit, and then carry
out investigation details 2.
Replace the unit.
Replace the unit.
Clean the resistor or fins.
Remedies
Replace the unit.
Investigate item 2.
Replace the unit.
Take remedies according to the
causes of the abnormality.
Ex. Incomplete grounding:
Additionally ground.
Noise: Noise measures for
other devices.
Remedies
Correct the power supply.
Investigate item 2.
Remedies
Replace the unit.
Investigate item 2.
Replace the unit.
Take remedies according to the
causes of the abnormality.
Ex. Incomplete grounding:
Additionally ground.
Noise: Noise measures for
other devices.
CV CR
CV CR
CV CR
CV CR