 
ABB Controls SSAC Timers Operation Diagrams
DELAY
ON MAKE
(On Delay, Delay on Operate, Operate
Delay, Prepurge Delay)
OPERATION: Upon application
of power, the time delay begins. The output is de- energized before and
during the time delay. At the end of the time delay, the output is energized
(relay is transferred) and remains energized until power is removed.
RESET: Removing power resets
the time delay and output.
INTERVAL
(On Interval, Interval On, Pulse Shaping,
Bypass Timing)
-
OPERATION:Upon application of power,
the time delay begins. The output is energized (relay is transferred) during
the time delay. At the end of time delay, the output is de-energized and
remains de-energized until power is removed.
RESET: Removing power resets
the time delay and the output.
RECYCLING
(Recycle Timing, Repeat Cycle, Duty
Cycling)
-
(ON TIME FIRST)
-
OPERATION: Upon application of
power, the output is energized (relay is transferred) and the ON time begins.
At the end of the ON time, the output de-energizes and the OFF time begins.
At the end of the OFF time, the output is energized and the cycle repeats
as long as power is applied. The OFF time may be the first delay in some
recycling timers.
RESET: Removing power resets
the output and time delays, and returns the sequence to the first delay.
SINGLE
SHOT
(One Shot Relay, Single Shot Interval,
Pulse Shaping)
-
OPERATION:Power must be applied
to the input before and during timing. Upon momentary or maintained closure
of the initiate switch (leading edge triggered), the output is energized
(relay is transferred) for a measured interval of time. At the end of the
delay, the output de-energizes. Opening or reclosing the initiate switch
during timing has no effect on the time delay.
RESET:Reset occurs when the
time delay is complete and the initiate switch is opened. Loss of power
resets the time delay and output.
DELAY
ON BREAK
(Off Delay, Release Delay, Delay on Release, Postpurge
Delay)
-
OPERATION:Power must be applied
to the input before and during timing. Upon closure of the initiate switch,
the output is energized (relay is transferred). The time delay begins when
the initiate switch is opened (trailing edge triggered). The output remains
energized during timing. At the end of the time delay, the output is de-energized.
The output will energize if the initiate switch is closed when power is
applied.
RESET:Reclosing the initiate
switch during timing resets the time delay. Loss of power resets the time
delay and output.
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