Motor control with photoeye, no plc

[jjnelson81]

I need to add a control circuit to our line. Currently there is a 480VAC motor with a quick-disconnect plug and a start/stop control box. I need to change this to a photo eye controlled circuit. It needs to be a fill level eye or prox. I am assuming I need a relay, the P.E, supply V for the P.E and supply for the relay.

I have little exp with controls npt utilizing a PLC. Just need a kick start on the logistics of this.

Thanks,

Jamie Nelson

 

[Barry1961]

There are plenty of photoeyes that can operate a motor starter without an additional control relay.

If you are in the US you would probably want a 115VAC PE that would be wired in series with a N.C. E-Stop/Off button then to the coil on motor starter.

Barry1961

 

[skiier]

Goe with what Barry says.
The start/stop cct probably is already stepped down to a lower control voltage, say 24VDC or 120VAC. Just wire the photoeye output (or dry contact) in "series" with a "Detented" E-stop button.
pretty painless me thinks

skiier

 

[Barry1961]

Depending on the physics of your application you may need something else in the circuit to keep the motor from starting and stopping too quickly. If your process can cause the motor to start and stop too often you will burn up your motor.

Some photoeyes have a built in time delay. Some of the cheaper photoeyes may have a big enough resolution where you may not need a timer.

You can have the photoeye turn on a timer which then after a delay turns on the motor starter.

You can have one photoeye turn on the motor starter and latch the starter in with an aux starter contact then have another photoeye turn it off. Like a 3 wire start/stop circuit using the photoeyes as the buttons.

All depends on what exactly you need to do.

Barry1961