Oldham CPS Series, User Manual

Page: 17 / 76

CPS
– User Manual
Page 17
Central controller electrical connections
Electrical connections are wired through the central controller MOTHERBOARD and the power
supply 24V. For the CPS central controller (wall-mounted version), you must open the casing door
to access the electrical panel.
Electrical connections must be done by a qualified professional. Observe all current Directives,
notably the European Low Voltage Directive. Customers in France must observe standard NF C 15-
100.
Main power supply
Test the current and voltage running through a network before making any connections. Never
connect the device without first disconnecting the power supply. The central controller does not
have an on/off switch.
Protect the central controller from upstream current with a 4A bipolar differential circuit breaker with
a type D response curve. This circuit breaker must be included in the electrical installation of the
building and must be placed near of the device and must be available for the operator. On the circuit
breaker will be indicated that it is the circuit breaker of the device.
Main power supply 100-240VCA : connector terminals L, N, and PE of the power supply 24V (Fig
3) for wall-mounted version or see connector picture 4 for rack version..
Pre-cabled wires are used to connect to the 24 VDC power supply module. The transformer output
connector is also hardwired to link to the 24 VDC central controller connector and to the (optional)
integrated printer for the rack-mounted version.
Grounding the central controller
The central controller is intended for use in areas that meet the Class II requirements for
overvoltage and degree of pollution as per EN IEC 60947-1. In order to comply with the standard,
the internal ground terminal
must be grounded (Fig 3).
Digital lines
The various digital modules are connected with
“Bus” connectors (Fig. 5). Recommended cable:
RS-485: 2 shielded twisted pairs, 100

.
One pair is used to power the module, and the other is used for communication. The cable shield or
tress should be connected to the terminal:
i
Data wires and the schield wires should be cut as short as possible.
Internal relay dry contacts
The RCT dry contacts for the 3 internal relays R1, R2, and R3 are available on the CPS central
controller motherboard on connectors J23, J24, and J25 (Fig. 7).
Working load: 2 A at 250 VAC, 24 VCC.
Associated alarm type: R1 (alarm/fault), R2 (alarm), R3 (alarm).
RS-485 serial link out
Recommended cable:
RS-485 cable: 1 shielded twisted pair, 100

. (Fig. 6).
WARNING
Contact with voltage may result in serious
injury or death.
Install all equipment and complete all wiring
work before turning on the power.
WARNING
Improper installation can result in
incorrect gas level readings or system
failure.
Carefully follow all instructions to ensure
proper system operation.