©2008 Ingersoll Rand Company Page 21
immediately at the start command. ½ seconds
later XO3-2 energizes. Both outputs maintain an
energized state while the motor is given a run
signal. When the motor is given a stop signal the
operating sequence of XO3-2 and XO3-3 are
reversed from the starting sequence.
Auto Stop Timer
The auto stop timer has a range of 30 to 3600
seconds. Zero can be selected, which will
prevent the motor from stopping during
automatic load/unload cycles. For values other
than zero, following pressure limit related unload
events, the machine will run for a minimum
amount of time before stopping. In addition, the
timing logic to stop the machine should be
optimized to reduce energy consumption based
on the maximum starts per hour for the motor
(Sh). This can be set for 6 or 10 starts per hour
and the controller will use logic to determine the
shortest stop interval whilst maintaining integrity
on the auto stop timer and starts per hour. The
starts per hour requirement, applies only to auto
stat/stop operation. The logic that is used allows
the compressor to automatically start and stop
until it reaches the maximum starts per hour. If
the maximum starts per hour is 6, for example,
and the auto stop time is set the minimum value
of 30 seconds, the compressor will be able to
start, load, unload, run unloaded for 30 seconds,
and then stop 5 times. On the sixth start, the
compressor will start when the pressure falls to
the load pressure (Ld). It will load and unload;
however, it will not stop if it runs unloaded for 30
seconds unless it has been one hour since the
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