Mitsubishi FREQROL-SF Troubleshooting Manual page 31

(6) Alarm NO.~~(NS~) N
[The signals of
spindle orientation encoder are checked
during orientation and synchronous tapping
state.1
Item Cause
The cable (MR-ZOLF) to
the spindle orientation
encoder is defective.
1
The encoder for the
spindle orientation is
defective.
2
The printed circuit
board SF-TL card is
defective.
3
The 5V power is not
supplied from the NC
side to the encoder.
4
Signal 2 (Spindle ENC)
O
phases
A, B, and C of the
from the encoder using an
oscilloscope.
Check the check pins on the
printed circuit board SF-TL
card.
Between CHl and DGA, for
phase A
Between CH2 and DGA, for
phase B
Between CH3 and DGA, for
phase 2
(See Appendixes 6(3) and
one and check that the equip-
ment correctly works.
(See Appendix 1 - 7.)
same manner as Item 1 above.
new one and check that the
equipment correctly works.
(See Appendix 7.)
from the encoder at CONB
on the SF-TL card using the
oscilloscope and check that
it is normal.
(See Appendix 1 - 7.1
NC side.
one and check that the equip- o Replace the cable with a new
ment correctly works.
Check
r
1 Troubleshooting
1.3
Checking method and
remedy of trouble
Remedy
encoder with the new one.
(See Appendix 3
new one.
board SF-TL card with a
new one.
(See Section 2.4.3.)
Repair the power supply on
the NC side.
Refer to M300 series
Maintenance manual
one.
plied from the NC side
(namely, when CONAA is not
connected with the NC),
shortcircuit the pin 5 on
the SF-TL card to pins 2 and
3 (no power supply form the
NC).