Digitally programmable time delay relay with display
The EZTimer by EZAutomation is a multi-function programmable timer with bright red LED display and two push buttons that can serve as an economical direct replacement for most octal or 11-pin socket time delay relays. EZTimers, and time delay relays in general, can perform simple control functions without the need for a programmable logic controller (PLC) or other controller. A time delay relay is equipped with a type of shock absorber that does not allow full power to flow immediately. Instead, power is delayed and allowed to flow slowly in or out of the coil.
The five most common application uses of a time delay relay in an industrial environment are: (1) conveyor belt timing, (2) light manipulation, (3) automatic engine start up, (4) furnace fan control, and (5) slow motor start control. The all-in-one programmable EZTimer provides the flexibility to program the delay to activate the relay from 0.01 sec to 999 hours. Four modes of operation include:
1. Delay on make (timed on delay): Timer delay begins as soon as the input power at operating voltage is supplied. The relay output is energized only at the end of the time delay and then it remains energized as long as input power is supplied.
2. Delay on break (timed off delay): Timer indicates that input power must be applied to the timer before and during timing. The time delay begins when the switch is opened (negative-edge-triggered) and the output remains energized during timing. The output is then de-energized at the end of the time delay.
3. Cycle: Timer indicates that when input power is applied at startup, the relay output is energized, and the timer on (TON) delay timer begins. At the end of the TON time, the output de-energizes, and the TOF (timer off) delay time begins. At the end of the TOF time, the output is energized, and the cycle repeats as long as power is applied.
4. Single shot: Timer indicates that input power must be applied to the timer before and during timing. Being positive-edge-triggered, the relay output is energized upon momentary or maintained closure of the switch. The energized relay also triggers the time delay. When the timer finishes its timing, the relay de-energizes.
The EZTimer is available in 120 V ac, 240 V ac, 12 V dc, and 24 V dc models. Relay outputs have a 2 Form C (DPDT or SPDT, double-pole, double-throw or single-pole, double-throw) rating of up to 10 Amps. No knobs or pots are required to estimate the timing requirements. The display also will show remaining and elapsed time with 1% absolute accuracy. It is said to be tamperproof, has programmable password protection, retains memory without a battery, and offers a 50% cost savings compared to other timers available in the market.
www.controleng.com/products has additional products. Also see the product section in the October 2015 print/digital edition of Control Engineering.
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