Magnetic Starter for Air Compressor

Has the breaker tripped on the incoming supply as a result of energising this thing?

If so, then disconnect it and hire a professional electrician.

Inside the cover is a schematic. The coil is probably 220 volts, will have to be wired right. If it was three phase before, the coil wire was hooked up different.

Manually push the solenoid in with something non-conductive, the motor should run. If it doesn't, your wiring is wrong, call and electrician before you hurt something.

Obviously you are not equipped with knowledge on how to connect it...in energizing motors you have to consider two things ...... POWER CIRCUIT and CONTROL CIRCUIT...

You've never mention A1 and A2....switch...these components are under control circuit...

It is a simple thing to wire or fault find a motor starter especially if you have a diagram & basic knowledge. I agree with the others get a qualified electrician to check it all out & fix the problem. Obviously there is a problem & you have the potential to do some real damage to the starter & It'll cost you a lot more to replace it than paying an electrician for an hour of his time & the other more important reason is the safety of all concerned using the compressor.

send us the wiring diagram of the starter.

Have you checked connections as per page 43, diagram 3 here?

A 3-phase starter will require all three lines to have the same (within tolerance) voltage & current across the phases to keep from tripping. If only two are connected, a trip condition is created.

check first if the coil of the contactor is good or not(you can check it by multimeter in Ω selection. note:need to cut the power and to remove the control cable )

Also need to be check if the control is 240v or 24v because same control run in 24v and need to be check if the coil of the contactor have power (240v or 24v) in run mode if not need to be check the controller for this system .if you need any help you can send to me an email *

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Try this. Because it's a 3 pole starter the overload needs the wiring altered.

Tony-

The motor is rated to operate on 240V, single phase. The wiring diagram you provided has a supply connection marking using N and L. You may have provided an incorrect wiring diagram since the supply lines for a single phase 240 Volts source are normally labeled as L1 and L2.. here in the U.S.

Thanks,

vsar

Only the labeling is different. The two wires in question are 240V apart.

Parallel to the start button there should be an auxiliary contact to keep the coil energised when your finger pushing the coil is released and an off button in series with the coil to switch off.

Sounds to me like you forgot to wire in your "start stop station". Look again very carefully for that section. Remember that you have to energize the motor starter with voltage to the starter "coil". Look for the coil terminals on the starter. It will tell what voltage it is. My guess would be 120 volts. You can omit the jumper if you put Line 2 to L3 terminal if you have the motor connected to T3. You're going to have one set of contacts not being used with your single phase supply. I would leave the T terminals disconnected to the motor till you get the starter working. Hope that helps.

One set of contacts not being used will lead to tripping due to imbalanced load. This is worked round by feeding the supply through two sets in series, as per the drawing in the post before yours.

What imbalanced load? It's pretty straight forward. L1-T1, L2-T2, L3-T3 are all closed when energized. It's a relay! Sorry folks. I am going to bow out of this discussion. I don't want to cause confusion for the one asking the question.

What appears to be forgotten is that this is a compressor & generally you don't use a latching contact to hold the contactor in, there has to be a pressure switch included in the control circuit to start & stop it or this thing will just keep running until something gives way.

In my 30 years I have never had a problem with overloads tripping from an imbalance when I have not used 1 leg of the overload & contactor & I think the extra wiring is not needed, unless specifically stated it is required by the manufacturer in the instructions for the starter.

There are many safety aspects & requirements that the OP will not know about & are not being discussed & I would recommend that the OP gets a qualified electrician to connect the starter & associated equipment correctly for the safety of every 1 using the compressor

Your wiring is correct, assuming that L1(Hot) and L2(N) - what you need to check are as follows:

1. Disconnect motor, and dry run control. - jumper any link that you may suspect

1. Check on/off switch should be wired to the coil of the magnetic starter.

2. check for any LP/HP and auxiliary switch for any open link

3. seek assistance from A/C technicians if you have no skills on electrical troubleshooting

Thank you, thanks all. Consulted an electrician, and despite the fact that this compressor was in service as is prior to my getting it, the starter is not even the correct one. What one gets off a ranch ...