DEIF PCM4.3 Interface module using the tutorial

DEIF PCM4.3 Interface module using the tutorial

Power supply units are available, in both 19" and half 19" 1U formats, for applications where an ac input power source is to be used. It is recommended that the power supply units are mounted directly above the System 57 rack.The field terminals on the Field Interface and Relay Cards accept up to 2.5mm˝ single or multi-stranded wire. Cables should be routed carefully to avoid physical and environmental hazards such as mechanical stress and high temperatures. Sensor wiring should consist of a cable with an earthed outer shield and should be routed away from sources of interference such as ac power cables, motors, machinery etc. All sensor cabling is subject to a maximum cable length that is dependant upon the cable line resistance and sensor types.

The current ratings of the power and relay cables should always be higher than the worst case maximum load requirement. All sensor field cables must be screened in order to ensure correct operation of the system and to meet European Standards for RFI and EMC. The cable screen of each sensor should be connected to the GROUND terminal of the appropriate Field Interface or Relay Card or another suitable ground point.

POWER REQUIREMENTS

 The System 57 operates from a nominal 24V (18V to 32V) dc power supply input which can be derived from various sources including the mains ac, via a separate ac to dc power supply unit, local plant dc supply and/or battery backup dc supply. The power supply is applied to the System 57 via the DC Input Card which provides terminal blocks that allow flexible power connections and diode isolation for two separate power supply inputs. The power rating required is dependent upon the sensor types, number of channels and configuration of the System 57. The following power budget calculation sheet allows for a quick and easy calculation of the worst case power requirement for the system. In many cases a lower power rating can be used, however, a more detailed power budget analysis should be performed to confirm the exact requirement.

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