SARGENT Timer Model - TMR2 Multi-Function - Manual (Page 5)

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6.1 ON DELAY
On delay functions as follows: When the timer is first powered, the delay begins with the
relay deenergized. When the delay expires, the relay energizes and stays energized until
power is removed from the timer. The unit is then ready for the next operation. The on
delay function is considered "self triggering" and the "T" (trigger) terminal is not used. If the
unit is unpowered and repowered before the delay expires, the time restarts without the
relay energizing.
To call up the on delay mode, Dip Switch 2 must be turned on (it is factory set off).
This is an additional step to having set Dip Switches 3 and 4 on. This makes the unit self
triggering as it "looks" for an open circuit between "T" and "+". If Dip Switch 2 is left off,
you will get the somewhat different mode described in the next section.
In the other modes, you use a trigger input from an N.O. or N.C. switch. Since the on delay
mode is self triggering and begins when the timer is powered, it appears that only a normally
open switch can be used. There is a way around this however if you have only a normally
closed signal available. The "R" terminal is employed. The timer should be powered
continuously with the normally closed external switch connected between "+" and R. With
the board in continuous reset, it will not start timing. When the switch opens, it will be as if
the board was just powered and it will go through its on delay cycle until the switch closes
again putting the board into reset.
6.2 TRIGGERED ON DELAY
Triggered on delay differs from standard on delay in that a momentary trigger latches in the
on delay function. To set up triggered on delay, Dip switches 3 and 4 are turned on and Dip
Switch 2 is turned off. Then, an N.O. switch is connected between "T" and "+". The
board should be continuously powered and when the trigger first closes , the delay period
will begin. Successive operations of the trigger will have no effect. When the unit times out,
the relay will energize and will stay energized until a second momentary switch closes
between the reset terminal ("R") and "+". Triggered on delay can only be initiated and reset
from normally open switches.
6.3 OFF DELAY
Off delay functions as follows: The timer is continuously powered and an external switch is
closed to trigger the function. This is done by connecting the "+" terminal to the T (trigger)
terminal. Once the trigger is closed to the + terminal, the relay energizes. If the trigger is
left closed, the relay will stay energized indefinitely. Once the trigger is opened, the delay
begins. The relay stays energized until time out and then it deenergizes ready for the next
operation. The term "off delay" is derived from the fact that timing begins when the trigger
is opened (turned off).
If the trigger is closed and opened again during the delay, the relay will stay energized but
the time set will begin again. This aspect of the off delay function is called retriggerability.
The delay can be extended any number of times by retriggering without the relay
deenergizing.
6.4 ONE SHOT
One shot can be considered non-retriggerable off delay. The timer is continuously powered
and an external switch is closed to trigger the function. This is done by connecting the "+"
terminal to the T (trigger) terminal. Once the trigger is closed to the + terminal, the relay
energizes and deenergizes after time out regardless of the state of the trigger switch. The
trigger switch can remain closed or can be switched during the timing cycle without affecting
the fact that the relay will deenergize after time out. The switch must then go from open to
closed to start a new cycle.