Fanuc Power Mate i-D/H Maintenance Manual

7. TROUBLESHOOTING
B63175EN/03
416
(b)Manual pulse generator is faulty
When you rotate the MPG, the following signal is output.
Measure the signal with synchroscope at screw terminal on back of
MPG. If no signal is output, measure +5V voltage.
Back of MPG
+5V 0V A B
Screw terminal
A: A phase signal
B: B phase signal
Rotation in plus Rotation in minus
+5V
0V
+5V
0V
A
B
1/4 phase difference
1 : 1
1:1
on off
1/4 phase difference
on off
on off on off
Threshold voltage of reciever for Power Mate :
V+n ()=3.3V
V+n ()=2.1V
Check on and off ratio and phase difference of HA and HB.
(5)Check of the torque limit
Check whether a torque limit is in effect.

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