Panasonic minas a series Operating Manual page 78

Category
Wiring CN I/F signals are chattering:
1) Servo-ON signals
2) Counter clear input signal
3) CW/CCW torque limit input signal
4) Command pulse input inhibit signal
Load inertia is large.
Installation
The initial (home) position varies.
Category
System When calculating the initial (home)
position, the Z-phase output is not
detected.
Creep speed to initial position is too
high.
The output of the initial (home) posi-
Wiring
tion proximity sensor (dog sensor) is
chattering.
Noise on encoder wires
Causes
1) Check the wiring and connections between CN I/F pins 29
and 41 by monitoring the display of input and output signals
status. Modify the wiring so that Servo-ON signals can be
made active correctly. Check the controller.
2) Check the wiring and connections between CN I/F pins 30
and 41 by monitoring the display of input and output signals
status. Modify the wiring so that Position Error Counter input
can be made active correctly. Check the controller.
3) Check the wiring and connections between CN I/F pins 17
and 18, and 16 and 17 using a circuit tester and/or oscillo-
scope. Modify the wiring so that CW/CCW torque limit in-
put can be made active correctly. Check the controller.
4) Check the wiring and connections between CN I/F pins 33
and 41 by monitoring the display of input and output signals
status. Modify the wiring so that Command Pulse Input In-
hibit can be made active correctly. Check the controller.
Check the overshoot at stop using the wave form graphics
function of PANATERM. Adjust the gains. If this is not effec-
tive, increase the capacity of the driver and motor.
Causes
Check that the Z-phase accords to the center of the proxim-
ity dog. Perform initialization correctly according to the con-
troller.
Decrease the return speed near the initial (home) position,
or lengthen the initialization sensor.
Check the input to the sensor using an oscilloscope. Modify
the wiring around the sensor. Take measures to reduce the
noise.
Take measures to reduce the noise (noise filters, ferrite cores,
etc.). Properly connect the shield wires of I/F cables. Use
twist-paired wires. Separate the signal and power wires.
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Countermeasures
Countermeasures