Mitsubishi FREQROL-SF, Troubleshooting Manual

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1 Troubleshooting
1.2
Checking method and
countermeasures of
trouble
tion
A
1 . 2 . 3
The equipment does not work in
The orien-
tation stop position deviates.
Although an alarm
appears, after turning on and off the power or resetting
the equipment, the equipment normally works.
Cause Check
Remedy
An instantaneous power
Check that an instantaneous
Check the cause of the
failure or voltage power failure occurred in
instantaneous power failure
1
drop of the input power
another facility in the same
and take the proper
occurs. (Alarm No.101
plant.
measures so that the same
situation will not occur.
The machine is Rotate the motor at a slow
Remove the cause of the load
loaded instantaneously speed and check that the
change.
due to affect of motor load changes through
2
rations and so forth. the status display.
Adjust the related control
(See Section or
so that the backlash becomes
(Note) This trouble
small.
often occurs when Check the backlash between
orientation is
the spindle encoder and
correctly conducted. spindle.
The equipment malfunc- Check the voltage waveform
Place a serge killer near
tions with a too large of the amplifier input pins
the noise source.
noise. Xl, x2, and X3 with an
(For example, 200 VAC,
(Power supply line)
oscilloscope.
DCR-2-12003-5041, made by
3 While removing suspicious
noise sources one by one,
check the voltage waveform
and find the real noise
source.
The equipment malfunc- Check the signal waveforms
Correctly connect the ground
tions by noise which at check pins
wires of the power supply,
enters a signal from for phase A signal and
amplifier, and motor.
the motor built-in (or for phase
(See Appendix
encoder.
B signal using an
Correctly connect the shield
4
scope.
Appendixes and
ground wire of the signal
line to the motor
built-in encoder by
(Note) When measuring the
referencing Appendix 1-4.
waveforms, turn off the
power of the amplifier
before using the check
pins.