Mitsubishi FREQROL-SF, Troubleshooting Manual

Page: 61 / 219

1 Troubleshooting
1.3 Checking method and
remedy of trouble
B
In case of un-synchronous tapping:
cause
Check Remedy
The speed of the spindle Change the parameter value
When the signal waveform
motor deviates for 10 of the amplifier for the in the open loop state
rpm or more. open loop state, input the
deviates:
speed reference and start replace the printed
command,
rotate the motor board SF-CA card
at a low speed, and check
with a new one.
the signal of the motor
built-in encoder (in the
When the signal waveform
in the open loop state
1
same manner as the check
method of the Item 6 of the
does not deviate, in
alarm
cordance with the Items 6,
7, and 8 of the alarm
No.23 adjust
the variable resistor in
the motor built-in encoder
and (ii) replace the
printed circuit board or
sensor with a new one.
The up to speed signal
Check the external signal in Take proper countermeasures
2
or zero speed signal is the status display diagnosis
by referencing Section
not issued.
mode by referencing Section 1.3.11.
1.3.11.
The orientation encoder In the same manner as the Replace the encoder with the
of the spindle is Item 1 of the alarm No.21
new one.
tive.
check the signal wave-
form.
3
Replace the encoder with a
new one and check that the
equipment correctly works.
(See Appendix 7.)