Use the tables in this chapter to calculate your power supply
requirements for system power supplies and legacy
bulk power supplies for non-I.S. systems.
Use the Worksheet for Intrinsically Safe System Power Requirements to
determine the number of power supplies required for Intrinsically Safe systems
and add the total number of I.S. power supplies to the Worksheet for Products
Using Only 24 VDC Power.
Make a copy of the tables and use them for each DeltaV system in your
plant. If you are using redundant power, remember to include calculations for
redundant system power.
Calculating Power Requirements
Follow these steps to calculate your power requirements:
- For products that use 12
VDC LocalBus power and 24 VDC bussed field power, use the Worksheet for
Products Using 12 V LocalBus Power and 24 VDC Bussed Field Power to record
quantity for each product and multiply quantity by the required amperage to
determine the:
- 12 VDC LocalBus power
requirements for each product
- 24 VDC bussed field
power requirements for each product
Enter the totals in the appropriate column (12 VDC or 24 VDC) in the
Worksheet for Products Using 12 V LocalBus Power and 24 VDC Bussed Field Power.
Add the total amperage requirements to get a subtotal of amperage requirements
for all products and enter the subtotal as Subtotal 1.
- For products that use 24
VDC power, use the Worksheet for Products Using Only 24 VDC Power to record
quantity for each product and multiply quantity by the required amperage to
determine the:
- 24 VDC power
requirements for each product
- Number of
Intrinsically Safe power supplies (if I.S. cards are used) required for I.S.
systems and add the total number of I.S. power supplies to the worksheet. Use
the Worksheet for Intrinsically Safe System Power Requirements to determine the
number of I.S. power supplies.
- Enter the totals in
the 24 VDC column in the worksheet.
- Add the total amperage
requirements to get a subtotal of amperage requirements for all products and
enter as Subtotal 2 at the end of the worksheet.
24 VDC Systems
- For 24 VDC systems, use
the Worksheet for System Power Requirements - 24 VDC Power Input to determine
the:
- Number of system power
supplies required to power the I/O cards.
- Amperage required from
the legacy
bulk 24 VDC power supplies to power the system power
supplies and bussed field power requirements.
12 VDC Systems
- For 12 VDC systems, use
the Worksheet for System Power Requirements - 12 VDC Power to determine the:
- Number of system power
supplies required to power the I/O cards.
- Amperage required from
the
legacy bulk
12 VDC Power Supplies to power the system power supplies and 24 VDC bussed
field power requirements.
Use the Worksheet for Bulk Power Requirements to determine the number
of legacy
bulk power supplies required.