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Participant

Join Date: Aug 2007
Posts: 2

Power Relays

09/17/2007 2:39 AM

I need information regarding the power relays... what are they??

Are there some which will work (supply to coil) at 440V.

In detail there are five motors (working at 440V) that i want to use.till dated all of them are started all together. but till the motor 1 completes its job motor two will not do further processing, thus the consumption of electricity is of no use for all rest too. they all are in series i.e. when motor 1 will complete its job motor two will start further processing after completion of the job of motor 2 it will be handed over to motor 3 and so on..

what i want to do is to start motor 1,3 and 5 at a time and after completion of their work i want to switch to motor 2 and 4. will it be efficient way to do so ????

Or the starting drawn current at every switching will become a problematic case?? The thing what i want to do is to use relay at supply lines of the motor which will provide me switching to make them ON or OFF. this alternative I found to reduce the electricity consumption as well as to make this economic than the PLC controllers...

Please help me in due respect..as i didn't have deep knowledge about electric motors

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Anonymous Poster
#1

Re: Can you help me

09/17/2007 3:35 AM

Hi!

I guess you are referring to the magnetic contactors as power relay. Magnetic contactors are available on several coil voltages such as 24V, 100/110V, 230V and 400/440V. Choice of coil voltage will now depend on your control voltage but to make it safe, choose the coil voltage that is not more than 110v.

The high consumption of electricity because of simultaneous operation and use of the motors has to be evaluated against the efficiency of the production line.

High starting current can be solved by the use of soft starters or reduced voltage starters.

There are soft starters that could handle more than one motor at the same time unless the size of the motors are too big and unsafe for the starter to handle.

You failed to specify how your production facility or system works. In this way, we could help you more on the proper sequence of motor starting.

Regards.

Gabby

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Power-User

Join Date: Jul 2007
Posts: 182
Good Answers: 1
#2

Re: Can you help me

09/17/2007 5:56 AM

Ice cube relays and timer blocks with resistor corrected voltages through your relays should work just fine. If your timers are set accordingly, you will save considerable electricity expenses; as the demand meter will not be established as all the windings and capacitors load at alternate moments.

Used this trick at several movie theaters to avoid A/C systems and high voltage projectors from hitting a six on the demand meter, quite effectively. Lost my calculations after the build. No one wanted anything that good, anymore.

Be careful you don't get fined for saving money or avoiding the taxes your going to save, by demand regulation, though. Especially if you are forced to pay estimated quarterly fuel charges or not generating your own power for those motors.

Tax incentives are long gone for this system.

Good luck!

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