Motor - Timer Control

[derekoc]

Hi everyone

 

I have an agitator motor which is running constantly. I want to put a timer into the circuit so that the motor can come on and off when i want. how do i achieve this and where in the circuit do i place the timer?? the motor is a three phase motor with each phase only drawing three amps. thanks

[marke]

Connect the contacts of the timer in series with the contactor coil.

 

This should be carried out by someone qualified to do this.

I would not expect a qualified person to ask this question, so asume that you are not qualified.

The voltages can be lethal!!

 

Best regards,

Mark.

[derekoc]

Connect the contacts of the timer in series with the contactor coil.

 

This should be carried out by someone qualified to do this.

I would not expect a qualified person to ask this question, so asume that you are not qualified.

The voltages can be lethal!!

 

Best regards,

Mark.

 

Thanks for that info. Can i get a three phase industrial timer? My local wholesaler says they cant be got??

[AB2005]

Thanks for that info. Can i get a three phase industrial timer? My local wholesaler says they cant be got??

 

You don't need a three phase timer. If you have OMRON product in your area, there is a TWIN TIMER in OMRON for such purposes.

 

http://www.ia.omron.com/product/family/1719/index_fea.html

 

[AndyBrawn]

I will also suggest you to use OMRON timer control  .The five time ranges are available for each timer by turning the time range selector every 60 degrees. And model with socket and model with wiring are also available.

[tioga]

If you want the motor to turn on and off when you want then you need a cyclic timer which can be set or programmed to your schedule. I suggest an SSAC (www.ssac.com) timer. I use them all the time in my control work. The timer contacts need to be connected in series with the starter contactor coil.

 

If the motor starter provides "low voltage" protection then you must change the momentary master switches with a maintaining master switch.

 

If the motor starter provides ''low voltage release" protection then you don't need to change anything.

 

If the motor starter provides "low voltage release effect" protection then you will have to add a 3-pole contactor with the timer contacts wired in series with the contactor coil.

 

Tioga USS Hornet

 

 

[tioga]

What you need is a "cyclic" timer that you can set and program your own schedule. An SSAC (www.ssac.com) timer would be perfect for you application. I use SSAC timers all the time in my control work. And, the timer contact does need to be wired in series with the contactor coil.

 

Before you do anything you must determine the following:

 

1. If the starter provides "low voltage" protection then you must change the momentary master switches to a maintaining master switch.

 

2. If the starter provides "low voltage effect" protection then you do nothing.

 

3. If the starter provides "low voltage release effect" then you must add a 3-pole contactor for the timer to control.

 

Tioga USS Hornet