©2008 Ingersoll Rand Company Page 16
Serial Port 2 (terminal XO8) [Enh]– Used for
IEO, ASC, ModBus Remote Monitoring and
Control of the compressor.
Integral Sequencing [Enh]–Through serial
communication port #1, terminal XO7 pins 1 and
2, it is possible to sequence 3 Intellisys
controlled compressors without a system
controller. This is possible through a cable
connection up to the 3 S3 controllers and using
one of the controllers as a system controller.
This feature can be used to create an air
compressor system operating coherently to a
single pressure target with automated timed
sequence rotation. In this configuration, the air
compressor designed as compressor “1”
becomes the system Master. System pressure is
detected by the Master’s delivery pressure
sensor and pressure regulation is determined by
the Master’s pressure set points. The Master
also determines sequence rotation. Air
compressors designated as “2” and “3” will
respond to load/unload commands from the
Master compressor.
The Master compressor (1) determines the
sequence of regulation for each compressor in
the system. Each compressor is assigned as
“base load” (A), “stand-by (B), or “second stand-
by” (C). The sequence assignment is rotated on
a routine bases in accordance with the
sequence rotation time interval setting of the
Master controller. The sequence assignment is
displayed in the status menu item of the Master
controller. The status of each compressor is also
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