Setting Up Photo Eyes~~~

[Waxman]

I tried to set up a dryer shutoff with photoeyes so when the customer pulls thru too fast, the blowers shut down. My thought was to save some energy when people go thru before their 60 seconds is up.

I had my electrician here helping and they just won't work.

How do photo eyes need to be setup to work properly? Tips appreciated. Thank you.

 

[pitzerwm]

First thing is that they need to be lined up, small trick. They usually feed a relay, you then use the relay to trigger/break the input/output to the dryer "circuit". Depending on your setup, determine the wiring, but the eyes must trigger the relay first or nothing else matters.

 

[dclark3344]

Hey Wax,
Are you sure the eyes are the right ones for your application? They have a distance that they are designed to read if you are spaced further than that distance they will not ever see each other.

 

[MEP001]

The voltage is important too - they usually run on 24vDC and not AC, and the output switch is not very strong, may not be able to switch a relay.

 

[Waxman]

The ones I got are Teleco and they get 110v power from plc.

The factory (Superior) said I need no relay and the dryer control panel is pre-programmed for photo eyes for blower shutdown.

This was supposed to be a simple, plug into the dryer control panel situation, but has proved more difficult.

My electrician is coming back monday to try again.

 

[ted mcmeekin]

As Bill noted be sure they are aligned --cover and then un cover one side and watch your plc input to see if it changes state. Distance would be no problem, we use the Telcos for undercarriages and safety feature on doors to be sure do not close on something. They work well-- our applications our 24 vdc on undercarriage input to plc or 24v ac for door operator input.

Another check I have mentioned before--look through your digital camera at each eye--one should have faint red light--if not something is wrong--bad eye, wrong voltage most likely.

Ted

 

[car washing systems inc]

Is one eye an emitter and the other a reciver, i put a set of eyes on a hydrospray and it took some time, had the factory on the phone and walked through it with them