Mitsubishi FREQROL-SF Troubleshooting Manual page 56

Item Cause
The orientation control
circuit is abnormally
set or defective.
(Note) The following
defective situations
can be considered.
1
a hunting.
is weak.
shoots in speed.
The detector (magne-
sensor or encoder) is
defective.
2
The following printed
circuit board is defec-
tive.
linkage:
SF-OR card or
3
SF-CA card
linkage:
SF-TL card or
SF-CA card
The backlash of the
portion where the en-
coder is mounted is
large.
4
Check
Item 1 of (b), check that
the position feedback
signal is normal.
Item 1 of (b) above, check
that the position feedback
signal is normal.
Item 1 of (b) above, check
that the position feedback
signal is normal.
the stop position of the for-
ward orientation differs from
that of the reverse orienta-
tion.
Set the following address and
data on the amplifier display
in the status display debug
mode.
(See Reference 1.2.1.)
Check that the display data
of the forward orientation is
the same as that of the
reverse orientation and there
is no electrical problem. An
example of display data is as
follows.
Remedy
control circuit by referenc-
ing Section 3.
referencing Section 3.
adjust such a circuit,
replace the detector with a
new one.
referencing Section 3.
adjust such a circuit, re-
place the printed circuit
board with a new one.
(See Section 2.4.2 and
2.4.3)
portion where the encoder is
mounted.
Continued on the next page.