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Sequence of Operation–AUTOMATIC
3. . .
BEGINNING OF RETRACT STROKE (Figure 13B)
As the ram nears the end of the extend stroke, it
activates P-1 (8), which in turn activates solenoid #2
of the main air valve. Air is shifted from the extend
end of the cylinder to the retract end, causing the
ram to begin the retract stroke. (The ram is reversed
before the cylinder is fully extended to cushion the
stroke.)
4. . .
END OF RETRACT STROKE (Figure 13C)
As the ram approaches the end of the retract stroke,
it activates P-2 (9), which in turn activates solenoid
#3 of the cushion air valve (2). This sends a burst of
air into the extend end of the cylinder, cushioning
the impact of the ram as it returns to the fully
retracted position. NOTE: Some of the cushion air is
allowed to exhaust through the main air valve and
through a flow control valve (6), which allows the
cushioning action to be adjusted for proper
operation.
NOTES:
1. . .
The above sequence is for the pusher as it is
wired at the factory. (See Wiring Diagram on
Page 9–Figure 9A). In this configuration P-3, the
home position sensor, is wired in series with the
test switch, and is used to override the
activation signal, to insure the signal is a pulse.
If the test switch is held closed, the pusher will
continue to cycle.
2. . .
The pusher may be re-wired to bypass P-3,
which
can
then
programmable controller or other device when
the ram is fully retracted. (See Figure 9B).
CAUTION!
The activation signal must be a pulse of no
more than 200 milliseconds. A longer signal
will override the retract signal given by P-1,
allowing the ram to overextend and "bottom-
out", possibly damaging the cylinder.
be
used
to
signal
FIGURE 13A
FIGURE 13B
a
FIGURE 13C
13
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