©2008 Ingersoll Rand Company Page 9
Digital Inputs
Emergency Stop Switch
[Std] – Located on
the front of the compressor next to the controller,
it is intended to stop the compressor only in an
emergency. This switch has two sets of normally
closed contacts that open when the red button is
pressed. One contact is wired into the 120-volt
AC power circuit and the other is wired into the
24-volt DC logic circuit. These parallel contacts
ensure that power is removed from the starter
and solenoids as well as the Intellisys controller;
this will stop the compressor immediately. Once
the switch has been pressed in, it will lock open
and must be manually reset by rotating the red
button clockwise.
Coolant Filter Condition [Enh] – A
differential pressure-sensing switch is installed
to monitor the condition of the coolant filter. This
switch is normally open and closes when the
differential across the filter exceeds 20 psi. This
switch is designated as 1DPS on the electrical
schematic and is wired into the controller at
terminal XO4 pins 1 and 3.
Inlet Filter Condition [Enh] – This sensor is
installed to monitor the vacuum at the inlet
valve. This switch is a normally opened switch
and will close when the vacuum across the inlet,
while unloaded, exceeds 15 psi and 1 psi when
unit is running loaded. The inlet filter switch is
labeled as 1VAC on all schematics and is wired
into XO4 pins 1 and 4.
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