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OUTPUT FUNCTIONS
11
The X4I will control the IR-PCB load/unload relay outputs
based on the active system load and unload pressure
setpoints. The IR-PCB load/unload relay contacts can be
used for compressor controllers that have electro-
mechanical pressure switch load/unload regulation.
IR-PCB Internal Output Circuits
The C01 and C02 terminals of the IR-PCB are intended to
control load and unload regulation of the compressor.
PRESSURE SWITCH REGULATION
For air compressors fitted with an electro-mechanical
pressure switch, a six-pin terminal C02 has been
provided to enable connection to a pressure switch that
has a two-wire or three-wire connection.
When connected, the pressure switch can be switched in
and out of circuit automatically. If the X4I is stopped or
experiences a failure or loss of power, pressure control
will automatically revert back to the pressure switch and
the compressor will continue to operate in “local” mode.
The local pressure settings of all compressors in the
system should be set in a cascaded manner such that the
system will operate normally in the event of X4I
inoperability.
The NC (normally closed) and NO (normally open)
terminal references of the IR-PCB are related to internal
connection functions and should not be referenced to the
connections of a compressor pressure switch, which will
generally be in reverse order.
Lethal voltages may be present on the terminals of
the air compressor pressure switch. Isolate the air
compressor power supply before starting any work.
+V
0V
LOAD
SOLENOID
C02
N
O
OUT
C
N
C
N
O
C
N
C
IN
Two Wire Pressure Switch Connections
+V
0V
LOAD
SOLENOID
RUN-ON
TIMER
C02
N
O
OUT
C
N
C
N
O
C
N
C
IN
Three Wire Pressure Switch Connections
DIGITAL REGULATION CONTROL TERMINAL C01
A 4-pin connector, C01, has been provided for air
compressor controllers fitted with digital inputs allowing
remote pressure regulation control.
This terminal provides volt free contact closure,
referenced to a common terminal pin, for:
• Remote Load Enable (remote/local
pressure regulation control)
• Remote Load (remote load/unload)
• Remote Variable Speed Regulation
Inhibit (remote variable/fixed speed
regulation control)
The “remote load enable” function provides the facility to
change the compressor load regulation from internal
control to a remote switching source (local/remote).
V
The “remote variable/fixed” function provides for
multiple variable speed compressor regulation control on
variable speed compressor(s) equipped with this facility.
When using the “Variable/Fixed” function, the “V”
terminal of the IR-PCB must be connected to the
appropriate “V” terminal of the X4I (according to
www.air.irco.com X4I System Automation