sdscuba

I'm in the process of setting up my new to me used high pressure compressor. I need some help with the electrical. It has a 5hp 230 volt Single Phase 23-24amp Baldor motor. I have the basic understanding that I need a Motor relay and a contactor, but I'm not sure what.

The compressor has a high pressure shut off switch and a high temp shut off switch, both of which should be rated at 240 volts.

On the compressor is a start button, and a selector switch for Off, Auto, or Manual.

So I guess I would take the 2 hot leads from my service panel to the relay, take the lead from the switches to the relay, then from the relay to the motor?

Any assistance would be appreciated.

Compressor photos are at: http://www.sdscuba.com/compressor

Haulin_in_Dixie

You will use a three wire cable. The two power wires go the the mains panel and to the main relay contacts. The third wire is grounded to the compressor and the power box at the house.

Generally the pressure switch is normally on and also the overheat switch. They would have to be in series going to the coil of the relay, or is the pressure switch part of the relay? Don't know, not enough information.

Mostwanted

without being there to look it all over, it will be hard to help.

First, is it 230V 3phase or single phase? If 3phase it must have 3phase 230volt supply or the motor will burn up. They do make single to 3phase converters tho.

Second you will need to make sure you get the corrct size motor starter for this motor (NEMA rating). The starter should have some auxillary contacts for your sealing circuit.

Post all of the data off of the motor and I will look it up and we will go from there. PRIAMRILY the catolog number.

sdscuba

Yes, the switches would be wired in series, they are all 240v low amp switches.


Motor Spec:

Catalog Number: JPL1409T
Specification Number: 36E774-190
Horsepower: 5
Voltage: 230
Hertz: 60
Phase: 1
Full Load Amps: 23
Usable at 208 Volts: 24
RPM: 3450
Frame Size: 184JP
Service Factor: 1.15
Rating: 40C AMB-CONT
Locked Rotor Code: F
NEMA Design Code: L
Insulation Class: F
Full Load Efficiency: 75
Power Factor: 88
Enclosure: OPEN
Baldor Type: 3634L
DE Bearing: 6207
ODE Bearing: 6205
Electrical Specification Number: 36WG0190
Mechanical Specification Number: 36E774
Base: RG
Mounting: F1

Haulin_in_Dixie

Ok so you will hook up the L1 and L2 as above discribed, the two wires to the relay contacts and the bare or third wire to ground and to the ground buss bar in the house box.

The relay normally called a motor starter generally has three contacts, for single phase you will only use two of them. These relays also generally have contacts for either normally on and normally off. Be sure to hook up as normally off.

The coil that operates the realy should be 110 volt with two contacts to hook up. When 110 is hooked up the relay closes and turns on the motor. Usually one leg is in series through the pressure and overheat switches and then to one of the 110 wires, which is generally the ground wire. The other contact goes to a shutoff switch (manual) and then to L1 or L2 to obtain 110 volts.

In the three wire single phase system two power wires (L1 and L2) together create 220 volts. Either of these in combination with the common or ground wire will create 110 volts. So when you run the 220 volt lines to the compressor you have 220 and two sources for 110. Use either of them for the 110, but not both or you will have 220 instead.

This is probably clear as mud, but the best I can discribe it. Make sure the voltages that the motor starter or relay is using for the coil that energizes it.

To add to that, depending on the equipment and the location in the country it is either 110 or 120 and 220 or 240, all the same thing. In New York the power company called it 117. Here it is 120, but does not matter. My power is actually 121 on one leg and 119 on the other.

Nevada

I need some cylinders aired up. Let us know when you are in business.

Will you be set up for Nirtrox?

sdscuba

It will be a full tech gas station in my garage, Nitrox, Trimix, and Argon.

I'm working on the storage cylinders and all of the blending. Dealing with 3500psi is an pain for finding inexpensive fittings.