Delay Timer Wiring

Why do this? If someone is going to push a button, why not just have them hold it in for a second to charge the capacitor?

(For the extra complexity, what you want is a "one-shot" relay. I don't remember if the Omron H3CR-A8E can be programmed that way.)

Why not use a potenial relay and a spdt relay, or a delay on make timer the same as a part winding start.

I want it to be no brainer so anyone can start it, i found out today that the timer does have that mode (J) but have not found out how to wire in the push button still. also i need to connect 2 500uf start capacitors to get 1 farad as the motor is 10 HP i dont know how to do this either or where i can get the caps (for a good price).

A 10-hp single-phase capacitor-start motor? Now there's a weird beast.

itsa 3 phase motor the capacitor is to temporarily give power to the third leg as i am running it on single phase. once it is running the timer opens the contactor disconecting tto the capacitor and wa-la 3 phase power. I got the plan at this site (://www.metalwebnews.com/howto/phase-converter/phase-converter.html)

You would wire the capacitors parallel. I'm not sure what you are asking. If you are looking for a momentary contact start arangement, you go from the push button to one side of the relay coil, you go from th NO to the load and also place a jumper from NO back to the coil ( holding relay) the jumper breaks through the stop button as momentary opening breaks the hold. Seems like you are going the hard way around to get 3 phase. The 10 hp will not come up to speed in 1 second or even 10 seconds single phase no matter what the cap is. You lose efficiency any way and I would just use a vfd ( 30% loss) single phase in, three phase out. To get 10 hp you would use a 15 h vfd and feed it with 60 amps 208-240. $750.00. They come with a start button and act as a soft start by their nature to eliminate the lra on start. Have never seen an american made 10hp single phase that didn't come with start and run capacitors on board and a centrifugal switch built in.

Im just going off of other designs i have seen they all say 100 uf per hp it may be more than 1 sec that was for a 3 hp motor i have a 10hp 3 phase the cap is to temporarily supply the 3rd leg. thats a great price for a VFD i would much rather use one but i have speant $162 total so far when i looked they $1000 for one either way i dont have that much to spend! Im sure when i can afford one i will purchase one,I plan on getting a CNC mill next year and i know it will not accept the varriance across the legs from the rotary convertor. thanks for your insight and help

I looked at Omron's data sheet. You need mode E, not J. Mode E lets you set the ON time (from pressing Start) on the dial. Mode J closes timed contact for 1 second [non-adjustable]. Wiring in diagram below will do job. You need another contactor to switch capacitors [switched by 1 - 3 contact of timer] - timer contact rated only 5 amp resistive. There is a problem with having the motor contactor coil in parallel with the timer - breaking circuit with stop button will divert contactor coil [inductive] current through timer and could wreck it. Not knowing if your control circuit is direct current DC or alternating current AC, or the voltage, I cannot suggest the remedy. Circuit works as follows. When start button is pressed, motor contactor is energised, timer "instant" contact (6 - 8) bridges start button to hold-in when you let go of button -timed contact (1 - 3) closes instantly with motor contactor/timer input, stays on for time set on dial, then opens and stays open until timer is de-energised. When stop button is pressed, everything is de-energised, both relays in timer reset.

Thanks alot that helps me so much . all the control circuits timer relay,contactor coils,are 120 vac the motor is 240 vac 3 phase i also have 3 120vac omron relays to put in front of contactor coils if needed

Further to my post #8, about timer mode E NOT J, apologies for not noting supply data in your post. I suggest a Harris V130LA20 MOV varistor across the timer coil (tmnl 2 to 7). Iwill look for alternatives later. I looked at G7L-2A datasheet (finally) and realize it is a small contactor, should switch capacitor OK, driven by 1 - 3 contact of timer.

Further to post #9, Littelfuse V130LA20AP is available from www.arrow.com who have Seattle office. Alternative EPCOS B72220S0131K101. Newark www.newark.com stock both makes.