Metacentre CX Box
Page 5
3.5 System Pressure Sensor (option)
The system pressure sensor (PS) must be
located in a position that is downstream of any
air treatment associated with the compressor
and is common to the air system network.
Pd
DP
PS
The system pressure sensor is optional.
The pressure sensor must be connected to
terminal X07 of the CX using an earth
screened, two-core (0.5mm
2
CSA minimum),
cable no greater than (10m) 33ft in length.
X07
28
27
+
-
+
-
PS
PS
10m
(33ft)
max
Wire polarity is important
System Pressure Sensor
3.6 Auxiliary Fault Inputs (option)
Aux Fault #3
X05
20
22
19
21
18
17
Aux Fault #2
Aux Fault #1
F1
F2
F3
Fault Inputs
3.7 Inhibit Function (option)
14
16
X04
13
15
Inhibit
IH
Inhibit Function
3.8 Speed Monitoring Input (Option)
Only applicable in ‘L’ load/unload mode;
ignored in all other control modes.
The CX Box is equipped with a ‘speed
detection’ input designed to function with a
‘VSD Speed Monitoring Kit’ (available
separately). This optional feature is intended
for use when the CX Box is utilised for
frequency inverter drive variable speed
control. The feature will provide a percentage
speed/output display and all required
functionality to enable total synergy with the
energy control, VSD compressor aware,
functions of a management system equipped
with this capability.
14
16
X04
13
15
+
rpm
3.9 R2 - 24Vac Output (option)
Output R2 is 24Vac and must be connected to
the coil of a 24Vac relay to provide a remote
volt-free output function contact.
S02-RT = ‘L’
(load/unload regulation Mode)
R2 = Fan Function
Menu Items; ‘Fan’ Function, AR1/2
S02-RT = ‘AR’
(load/unload regulation Mode)
R2 = Active Function
Menu Items; ‘Active’ Function, AR1/2
S02-RT = ‘3S’, ‘5S’ or ‘V’ regulation modes:
R2 is used for regulation control dependant of
regulation mode type.
3.10 AR1/2 Auxiliary Outputs (option)
3
1
3
2
3
3
3
4
X08
X09
R5
R6
AR2
AR1
Volt-free relay contact outputs
CE
: 240V,
UL
115V @ 4A maximum).
Menu Items, AR1/2 Functions
