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Messages - roypthomas

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Technical support / Re:nano-10 for HMI based Motor speed control Application

« on: January 17, 2013, 01:32:07 AM »

Thank you for your advise.

Could you provide some programming sample codes to measure the pulsefrequency for the PID and some scaling of PID output to PWM?

As for the SCADA, I am using cimplicity which support Modbus RTU. But I am not sure how to assign the device ID for the nano10 as slave ID assign the modbus address to "speed", P,I,D,"setpoint" variables in nano 10.

Could you also provide the "fwd" diode number to bypass back emf?

Anyway I can get a sample program for this. it would help a lot to demostrate.

Thank you.

Technical support / Program development opportuniy

« on: January 17, 2013, 01:22:02 AM »

Could anyone share your expertise to write an example program to create PID motor speed control program for Nano 10?. The program need to use PWM output to control the speed in rpm. The encoder input will count one pluse for each rotation.

Then I need to interface with cimplicity for trending of PID loop.
The PID parameters and setpoint will be handled by Cimplicity.

please send to me Roy_p_thomas@hotmail.com

it would be great to share the expertise for future projects.

Technical support / nano-10 for HMI based Motor speed control Application

« on: January 16, 2013, 12:23:58 AM »

I purchased nano 10 from singapore sales office. My project is to develop a demo PC based PID motor application. I can use any HMI, to communicate with nano10.

1. Can I connect a 24VDC motor directly to PWM. will there be any back emf. what should be typical motor specification that I can connect directly without a motor driver?

2. My aim is to measure the speed of the motor and control its speed using a PID control on nano 10's PWM output. I intent to connect the power supply of the motor direct to the PWM output of nano10. I am not sure whether this will work. if it works, I need to write the nano10 program to mesure the pulses from the encoder as the motor turns and calculate the err= current speed count- setpoint and send corresponding PWM signal to the motor.

3. For the visualization, Once the motor is able to control at setpoint set on the HMI and plot a trend chart to analyse the PId performace, what protocol and products can be used?

Since the singapore side technical support is unable to provide a solution, please advise the steps.

Roy Thomas