
11. TROUBLESHOOTING
B–63525EN/02
736
(2)Manual pulse generator failures
When rotated, a manual pulse generator generates the signals shown
below. Using an oscilloscope, measure the signals from the screw
terminal block located at the rear of a manual pulse generator. If no
signals are output, measure the +5 V voltage.
+5V 0V HA HB
Screw terminal
block
Rear of a manual pulse generator
HA: Manual pulse generator phase A signal
HB: Manual pulse generator phase B signal
+5V
0V
+5V
0V
HA
HB
1/4
1 : 1
1 : 1
When rotated in the plus direction When rotated in the minus direction
On Off
On Off
On Off
On Off
1/4 (phase difference)
Check the on/off ratio and the phase difference between HA and HB.
If the I/O module is not allocated properly in I/O link allocation, the pulses
of the manual pulse generators are not transmitted to the CNC, making
it impossible to perform manual handle operation.
The I/O modules to which manual pulse generators can be connected are
listed below.
Name Specifications
I/O module for connector panel (extended module A) A03B–0815–C002
I/O module for operator’s panel (supporting matrix input) A20B–2002–0470
I/O module for operator’s panel A20B–2002–0520
Interface unit for machine operator’s panel A20B–2201–0110
Main panel A of machine operator’s panel A02B–0236–0230
Main panel B of machine operator’s panel A02B–0236–0231
Main panel A1 of machine operator’s panel A02B–0236–0240
Main panel B1 of machine operator’s panel A02B–0236–0241
If a multiple number of these modules are used and are allocated so that
they use a manual pulse generator, the module nearest the CNC becomes
effective because of the I/O link connection.
3 Allocation of the I/O link
of the I/O module