Approach By Each Phenomenon; Details When Alarms And Warnings Are Displayed In The 7-Segment Led - Mitsubishi Electric MDS-B-SPJ2 Series Specification Manual

11.4 Approach by each phenomenon

11.4.1 Details when alarms and warnings are displayed in the 7-segment LED

(1) Alarm No.
[Details] The main circuit DC bus (PN) voltage of the spindle drive unit became 200V or less.
Investigation items
1 Is there a contactor
(MC) to externally shut
off the main circuit?
2 Contactor operation
and continuity check
3 Observe the charge
lamp turning ON when
an alarm occurs.
4 Input voltage and PN
voltage check
1) Is there an open
phase?
2) Is the power
capacity small?
3) Does a momentary
power failure occur? No error.
11. Troubleshooting
10 : UNDERVOLTAGE
Investigation results
Externally installed.
Not externally installed.
Contactor continuity error.
Contactor operation error.
1) The contactor does not turn ON.
• Contactor signal (output voltage)
error from the unit.
• Connector (CN3) is coming
loose.
• The cable is broken.
2) The timing is delayed.
• The contactor ON signal was
executed with a separate
sequence.
No problem.
Charge lamp stays ON for a while.
Charge lamp momentarily turns ON,
but turns OFF immediately when the
alarm is issued and the contactor
turns OFF. Or, the lamp turns OFF
immediately when the power is
turned OFF.
Lamp does not light at all.
There was an open phase.
The input voltage drops during
acceleration.
A momentary power failure occurred. Reconsider the power.
Investigate item 2, and carry out the
appropriate measures.
Investigate item 3, and carry out the
appropriate measures.
Inspect the contactor and replace if
required.
Inspect the unit and replace if
required.
Correctly connect the unit.
Replace the cable.
Reconsider the sequence.
(Or, change the signal from this unit.)
Investigate item 3, and carry out the
appropriate measures.
Investigate item 4, and carry out the
appropriate measures.
Inspect the unit and replace if
required.
Inspect the unit and replace if
required.
Input the correct 3-phase 200V.
Reconsider the power.
Replace the unit.
11 − 4
Remedy