Closed Loop Spindle +/-10Volts
28 Jan 2023 22:28 #263127
by mloser
Closed Loop Spindle +/-10Volts was created by mloser
I used pncconf to set up the spindle. Encoder counts correctly when I turn the spindle by hand.
I have a 7i76, 7i77 and 7i73. I'm using the 7i76 for spindle control. The motor is a 3000 rpm DC
motor with 2 pulley arrangements for 0-1800 rpm and 0-4800 rpm. The spindle amplifier takes
a +/-10 volt signal which is from the 7i76. When I attempt to jog the spindle it runs the motor up
to about 2000+ rpms and hunts up and down in rpms. I attached my ini file and hal file. I tried to
adjust many things but to no avail.I tried the pncconf tuner for the spindle but it ran it at high rpm
as soon as I clicked "Amp Enable". It did work in open loop mode before I installed the encoder.
The spindle drive has both a torque and rpm mode. I tried both.
Thanks,
Mike
I have a 7i76, 7i77 and 7i73. I'm using the 7i76 for spindle control. The motor is a 3000 rpm DC
motor with 2 pulley arrangements for 0-1800 rpm and 0-4800 rpm. The spindle amplifier takes
a +/-10 volt signal which is from the 7i76. When I attempt to jog the spindle it runs the motor up
to about 2000+ rpms and hunts up and down in rpms. I attached my ini file and hal file. I tried to
adjust many things but to no avail.I tried the pncconf tuner for the spindle but it ran it at high rpm
as soon as I clicked "Amp Enable". It did work in open loop mode before I installed the encoder.
The spindle drive has both a torque and rpm mode. I tried both.
Thanks,
Mike
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29 Jan 2023 02:25 #263148
by Gorts Revenge
Replied by Gorts Revenge on topic Closed Loop Spindle +/-10Volts
Off the cuff, it sounds like a PID loop tuning problem.
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29 Jan 2023 02:38 #263149
by PCW
Replied by PCW on topic Closed Loop Spindle +/-10Volts
The 7I76 analog output is 0 to 10V plus a direction signal not +-10V
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29 Jan 2023 04:52 #263151
by mloser
Replied by mloser on topic Closed Loop Spindle +/-10Volts
I'm sorry. My mistake. The drive provides 18 VDC which is fed to the 7i76 TB4 spindle- and spindle+
0V is full speed CCW
9V is stopped (bias is off a little)
18V is full speed CW.
0V is full speed CCW
9V is stopped (bias is off a little)
18V is full speed CW.
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