Hi, I have a PLC that I'm trying to send a PWM signal out to a DC motor driver for varying speed.
My PLC output signal is 24VDC sinking type and I vary the duty cycle from 0-100% over a pre-selected set frequency. I can connect a small DC motor directly and control speed nicely. But I have selected a motor driver for the larger DC motors I'm using now (4 full load amps)
The driver works well to start/stop/reverse the motor with its onboard push buttons. But not so well to control using the PWM input signal option.
The motor driver board accepts 0-0.7v(low) signal and 1.3-5.0v(high) signal levels. This is a problem because I cannot get the PLC control signal to work with this driver. I've tried opoisolators and IR520 MOSFETS but have had no success.
Can anyone explain the simplest way to circuit methods to convert these control signals?
Thanks
My PLC output signal is 24VDC sinking type and I vary the duty cycle from 0-100% over a pre-selected set frequency. I can connect a small DC motor directly and control speed nicely. But I have selected a motor driver for the larger DC motors I'm using now (4 full load amps)
The driver works well to start/stop/reverse the motor with its onboard push buttons. But not so well to control using the PWM input signal option.
The motor driver board accepts 0-0.7v(low) signal and 1.3-5.0v(high) signal levels. This is a problem because I cannot get the PLC control signal to work with this driver. I've tried opoisolators and IR520 MOSFETS but have had no success.
Can anyone explain the simplest way to circuit methods to convert these control signals?
Thanks