I will be operating a variable speed screw feeder using the 4-20 ma output from the Hardy Rate controller and I need to activate a separate hopper vibrator motor whenever the screw feeder motor operates. Does the ON/OFF output relay contact on the back of the Hardy Rate controller correspond to the 4-20 ma output in any way, or is this relay just to indicate when the Hardy Rate is actually turned on and off? I do not want the vibrator running unless the screw is actually feeding, so I need a contact that closes only when the Hardy Rate controller is calling for product to be discharged.
