Delaying the start of a water pump

Discussion in 'General Electronics Chat' started by Scavenger, Jun 30, 2006.

  1. Scavenger

    Thread Starter Member

    Jan 5, 2005
    Hi: I'm a newbie looking for help. I have a generator at my cottage that I startup (remotely) to pump up the water. The pump is wired for 240V. I'd like to have the power to the pump switched on after the generator has been running for ~15 seconds. Is there some circuit I could use to switch on the 240V after the 15 second delay? I need this circuit for two reasons: an attached ultraviolet purifier has a 5 second startup time (don't want water flowing until then), and I'm worried about damage to the pump motor when the generator isn't up to full power.

  2. thingmaker3

    Retired Moderator

    May 16, 2005
    What you want is called a "time delay relay" or TDR. You want one for "on delay" or "delay on energization." Be sure to get one that can handle at least 120% of the current your pump draws. I'm confident that either Tyco, Schneider, or Alen Bradley would have something to fit. Check with your local electrical supplier.
  3. Gadget

    Distinguished Member

    Jan 10, 2006
    Yep, like he said. They are fairly Pricey, but are commonly used in many industrial switchboards.
  4. Scavenger

    Thread Starter Member

    Jan 5, 2005
    Thanks for the replies. :) I'll check with my local supplier.
  5. bob/bergelectric

    New Member

    Jul 7, 2006
    three simple words...Delay On Make....