V130-33-TR20 HSC issues

[borisb]

Hi

I’m using V130-33-TR20 PLC and I have some severe issues with the high speed counter:

I’m using incremental encoder with A,B outputs, I’m using ISQ5 chip to get 24V for each pulse of the encoder and connect it to the PLC into the HSC input, it seems that it miss counts. The encoder cables are shielded and away from the motor.

It is a simple DC motor which I operate with PWM and H-bridge.

What can be the problem?

 

Thanks a lot!!

 

 

 

[Joe Tauser]

I've rolled my own 5V pulse level shifter before and sometimes the circuit doesn't behave the way I think it should.  The first thing I would do is put a scope on the output of the ISQ5 chip and see what the pulses it's making look like.

 

Joe T.