Cycle timer

[Smash]

Can anyone recommend a single phase 240V cycle timer for a 1/4 HP motor. This is for a small chip conveyor that will be attached to a large steel cutting saw. The conveyor will simply carry the chips away from the saw into a bin. Need something for an oily industrial setting. The operator will simply turn it on and the timer will cycle for a man shift on approx 10 min then off for 30min and repeat. Or be custom programmed for that particular day of cuts. I could install an emergency stop button next to or if it came with one perfect. No variable speed no reverse just on off at programmed times. 240V Thank you for suggestions.

 

[LarryFine]

Do you have a neutral available? If so, you could use a 120v timer and a contactor.

 

[TwoBlocked]

Did not see a hp rating. Might need to contact the manufacturer.

McMaster-Carr

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McMaster-Carr

McMaster-Carr is the complete source for your plant with over 595,000 products. 98% of products ordered ship from stock and deliver same or next day.

www.mcmaster.com

McMaster-Carr

McMaster-Carr is the complete source for your plant with over 595,000 products. 98% of products ordered ship from stock and deliver same or next day.

www.mcmaster.com

 

[TwoBlocked]

Ahhh, maybe not. I'll check more specs later. It might not be able to be off a different length of time than it is on. Been through this before.

 

[ATSman]

IDEC has been around a long time and probably has what you need:

Idec cycle timer - Google Search

 

[jim dungar]

This function may be called an interval timer.

 

[TwoBlocked]

Plenty of interval timer relays rated at 240V, 5A resistive, but doesn't mention the HP rating. The manufacturers may be able to help.

 

[LarryFine]

What about triggering the conveyor to start up whenever the saw runs?

It would be easy to add a timer to keep it on for additional minutes if needed.

 

[ptonsparky]

IDEC has been around a long time and probably has what you need:

Idec cycle timer - Google Search

This function may be called an interval timer.

No, too simple.
We need to add a PLC, an HMI, Ethernet, and a few hours of programming.

 

[LarryFine]

No, too simple.
We need to add a PLC, an HMI, Ethernet, and a few hours of programming.

We are such nerds! How complicated can we make a simple procedure?

 

[qcroanoke]

Is that a challenge?

 

[LarryFine]

Is that a challenge?

Sure. Make Rube Goldberg proud.

 

[TwoBlocked]

Let's start with a vibration sensor on the saw. Then for sure we know it's running instead of relying on a contactor pulling in. NEXT ... ???

 

[ptonsparky]

Let's start with a vibration sensor on the saw. Then for sure we know it's running instead of relying on a contactor pulling in. NEXT ... ???

I was going to count the teeth to make sure it was up to RPM then compare that with an an analog amperage input to make sure that 1/4 HP isn't overloaded on occasion.

 

[Tulsa Electrician]

Add switch and a sign.

Turn on to run.
Turn off when done.

 

[TwoBlocked]

I was going to count the teeth to make sure it was up to RPM then compare that with an an analog amperage input to make sure that 1/4 HP isn't overloaded on occasion.

Oooo, yeah! Use a pass through laser and high speed counter to check for any broken teeth. And get the amps off the VFD (of course). Compare that to the table in the PLC to see if the saw if getting dull. Update the maintenance schedule to bring someone in to change the blade. Use profibus and a modem to contact the tech on his iPhone.

What other solutions are looking for a problem?

 

[TwoBlocked]

Add switch and a sign.

Turn on to run.
Turn off when done.

Wouldn't a bluetooth app be better?

 

[Tulsa Electrician]

Maybe just put a time off delay on it.
When the saw shuts off the chip motor will run for 10 min. Then you only need to control the saw.
Get a control volt din rail type. A set of aux on saw starter should do it. Tie into you chip saw starter/ relay

 

[qcroanoke]

What other solutions are looking for a problem?

Power off when bin is full signal

 

[texie]

If the OP is OK with just simply running the conveyor when the saw runs a quick and easy solution would be just use a RIB current sensor with a RIB dry contact relay.