Mitsubishi FREQROL-SF Troubleshooting Manual page 61

Ac spindle drive
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cause
The speed of the spindle 0 Change the parameter value
motor deviates for 10
rpm or more.
1
The up to speed signal
or zero speed signal is
2
not issued.
The orientation encoder
of the spindle is defec-
tive.
3
Check
of the amplifier for the
open loop state, input the
speed reference and start
command, rotate the motor
at a low speed, and check
the signal of the motor
built-in encoder (in the
same manner as the check
method of the Item 6 of the
alarm No.23(OSE)).
the status display diagnosis
mode by referencing Section
1.3.11.
Item 1 of the alarm No.21
check the signal wave-
form.
new one and check that the
equipment correctly works.
(See Appendix 7.)
1
Troubleshooting
1.3 Checking method and
remedy of trouble
Remedy
in the open loop state
deviates:
replace the printed cir-
with a new one.
in the open loop state
does not deviate, in ac-
cordance with the Items 6,
7, and 8 of the alarm
No.23 (OSE), (i) adjust
the variable resistor in
the motor built-in encoder
and (ii) replace the
printed circuit board or
sensor with a new one.
by referencing Section
1.3.11.
new one.
B

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