Installation 2704 Controller
2-4 User Guide Part No HA026502 Issue 5.0 Aug-04
2.2. WIRING
WARNING
You must ensure that the controller is correctly configured for your
application. Incorrect configuration could result in damage to the process
being controlled, and/or personal injury. It is your responsibility, as the
installer, to ensure that the configuration is correct. The controller may either
have been configured when ordered, or may need configuring now. See 2704
Engineering Manual Part Number HA026933 for details.
Before proceeding further, please read Appendix B, Safety and EMC information.
2.2.1. Electrical Connections
All electrical connections are made to the screw terminals at the rear of the controller. They
accept wire sizes from 0.5 to 1.5 mm
2
(16 to 22 AWG) and should be tightened to a torque of
0.4Nm (3.5lbin). If you wish to use crimp connectors, the correct size is AMP part number
349262-1. The terminals are protected by a clear plastic hinged cover to prevent hands, or
metal, making accidental contact with live wires.
2.2.2. Rear Terminal Layout
The rear terminal layout is shown in Figure 2-3, which identifies terminal designations and
their functions. Refer to the individual diagrams to wire the controller to your requirements.
The two outer terminal strips have fixed hardware for all versions of the instrument, as
follows:-
• A Process Variable input which can be configured for:-
• Thermocouple, RTD, Pyrometer, Voltage (e.g. 0-10Vdc) or Milliamp (e.g. 4-
20mA) plus vacuum – log10
• Seven Digital I/O, configurable as input or output
• Inputs are logic (-1 to 35Vdc) or contact closure, and can be configured for:-
Manual, Remote, Run, Hold, Reset, etc,
• Outputs are open collector requiring an external power supply, and can be
configured as event, status time proportioning or valve position outputs.
• One digital input
• An I/O expander which allows additional digital I/O via an external unit, or an extra
digital input
• A changeover relay which can be configured as an alarm or event output. It cannot be
configured as a time proportioning output
• An analogue input for volts (e.g. 0-10Vdc) or Milliamp (e.g. 4-20mA) signals to a second
PID loop, setpoint, etc,. (This input can be characterised to match a particular curve from
a transmitter. It cannot accept thermocouple inputs directly)
• Power supply to the unit. The supply may be 85 - 264Vac 50 or 60 Hz,
The three central terminal strips are for optional plug in modules, as follows:-
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