MAN0443.P65 Issue 13 Aug 04
5701 Control System
05701-M-5001 A02279
CHAPTER 4 - INSTALLATION INSTRUCTIONS
4 - 9
5.
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.
The 8-Way AC to DC Power Supply Units can provide a 50W dc supply
or a 100W dc supply depending upon whether one or two switch mode
modules are incorporated in the power supply unit.
Similarly, the 16-Way AC to DC Power Supply Units can provide a
50W, 100W, 150W and 200W dc supplies depending upon whether
one, two, three or four switch mode modules are incorporated in the
power supply unit.
To calculate the power requirement:
(1)
Enter the number of devices of each type used in the system in column
B.
(2)
Multiply by the unit power shown in column C.
(3)
Enter the result in column D.
(4)
Add up column D to calculate the total power required.
