DCS system module SCXI-1100 industrial control spare parts inventory

DCS system module SCXI-1100 industrial control spare parts inventory

Technical data of product parameters

The power supplies and power distribution, if incorrectly designed, are a
possible electrical or fire safety hazard and can contribute to common cause
failure. It is therefore necessary to: SCXI-1100
• Establish the power philosophy, specific earthing philosophy, power
requirements, and the separation requirements where items of
equipment are separately supplied, for example system internal supplies
and field loop supplies.
• Make sure that the chosen Power Supply Units (PSUs) are compatible
with the power feeds supplied. Alternatively, measures must be put in
place to make sure that the power feeds stay within the specifications of
the PSUs. SCXI-1100
• Define the power distribution requirements, together with the protective
philosophy for each distribution; for example, current limited at source
or protective devices. Where protective devices are used, it is important
to find out that sufficient current will be available to make sure their
protective action and the protective device can break the maximum
prospective fault current.
• Make sure that the power supplies are sufficient to meet the system load
and for any foreseeable load requirements and load transients.
• Make sure that the power supplies have a minimum hold up time of 10
ms. SCXI-1100
• Make sure that the power distribution cabling is sized to allow the
maximum prospective fault currents and tolerable voltage losses. This is
specifically important where floating supplies are employed and other
power sources can cause high prospective fault currents if multiple earth
faults occur.
Estimating Power
Consumption SCXI-1100
To estimate the power supply requirements (power supply sizing) you need to
know the power consumption of all the modules. Use the following table to
estimate the system power consumption.The above figures are worst case values calculated from the
range of operating voltages and currents. If your system is
required to meet UL/CSA standards the power consumption and
the corresponding electrical ratings must not exceed the
maximum electrical ratings given in the table included in the
topic “Backplane Electrical Ratings”.

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