Metacentre CX Box
Page 11
3.14 Compressor Interface PCB
The ‘i-PCB’ is designed to interface a
compressor with the CX using a 6-core, earth
shielded, cable no greater than 100m (330ft)
in length.
Each compressor in the system must be
assigned a unique identification number from
1 up to the number of compressors in the
system. The identification number should be
clearly indicated on each compressor for
operational reference.
For each compressor connected to the CX
utilising an ‘i-PCB,’ the signal wires must be
connected to the CX terminals dedicated for
the assigned compressor reference number.
i-PCB
LED 1
LED 2
C01
C02
C04
C03
2
4
6
1
3
5
X01
2
4
6
1
3
5
#1
C05
The ‘i-PCB’ is a DIN rail mountable module
designed to be installed within the compressor
control or switchgear area.
Each air compressor must be equipped with a
load/unload regulation system and, if not
regulated with a single electro-mechanical
pressure switch, have a facility for a remote
load/unload control with the ability to accept a
volt-free switching contact input for remote
load/unload.
Consult the air compressor manual or your
air compressor supplier/specialist for details
before installing the CX.
The ‘i-PCB’ uses a 12V to 250V input voltage
detection system and universal relay contact
control outputs (240V ‘CE’ / 115V ‘UL’ @ 5A
maximum). Integrated directly into the circuits
of an air compressor, the ‘i-PCB’ avoids the
need for additional relays or remote inputs.
The ‘i-PCB’ also acts as an electrical barrier
between the compressor and the CX providing
protection and voltage isolation.
4.14.1 Input Functions
The ‘i-PCB’ is fitted with a six-pin terminal C04
for compressor monitoring. The ‘i-PCB’ uses
two inputs (Ready and Run) to determine
compressor status. An Alarm input can be
used if compressor alarm indication is
available and required. The Alarm input is
optional and is not necessary for system
operation.
Ready Input:
The ‘Ready’ connection is intended to indicate
that the compressor is in a ‘started’ state, has
no operational inhibiting fault condition and is
ready to respond to CX regulation without
manual intervention.
0V
+V
READY LAMP
RUN
READY
ALARM
C04
The READY input will accept 12V to 250V ac
(50/60Hz) or dc.
Do not connect a voltage greater than
250Vac/dc to this input.
This input must be connected to the terminals
of a ‘ready’ or ‘operational’ lamp, or other
circuit of the compressor control system, that
will be energised when the compressor is in a
started (standby or running) condition.
The voltage to this input must de-energise
when the compressor is stopped and
unavailable to produce air upon a load signal,
or the Emergency Stop button is pressed, or
when the compressor experiences a fault that
prevents the compressor from running.
