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from the Automation List department...
DC Motor
PLCs topic
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Posted by Sara on 11 April, 2008 - 5:26 pm
How to control three DC motors using PLC so that two other motors' speed is based on the first motor?

Posted by tn on 18 April, 2008 - 2:12 am
Hi,

First motor should produce speed feedback (tachometer, encoder...) to your PLC. Other two motors are then controlled using this value.

tn

Posted by Bill Schwarz on 20 April, 2008 - 5:00 pm
You could control all three motors from one DC drive, or if they are controlled by three separate drives, let the PLC send the same speed reference/command to all three drives. You also could attach a tachometer or encoder to the first motor, and input the speed signal from that motor to your PLC, then use that speed feedback as a speed command to the other two drives. This really depends on the details of the application, what the motors are driving, response required, etc.

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