<2. Basic Design and Function Design>
● Calculating Current Consumption of an FCN Unit
The current consumption of the system power supply of an FCN unit can be
obtained by summing the current consumption values of the base module, as well
as the CPU modules, I/O modules, and E2 bus/SB bus modules installed on the
base module.
If I/O modules requiring analog field supply are mounted in the unit, the current
consumption of the analog field supply of the FCN unit should be calculated
additionally. The system power supply current consumption and analog field
supply current consumption values of individual modules given in the “STARDOM
FCN/FCJ Guide” can be used for these calculations.
An example of current consumption calculation
This example calculates the current consumption of the control unit, as well as,
that of the extended unit, shown in the figure below.
- Calculating current consumption of control unit
System power supply
Current consumption of NFCP501 modules : 1200 mA×2 =2400 mA
Current consumption of NFAI141 modules : 310 mA×2 = 620 mA
Current consumption of NFAV141 modules : 350 mA×2 = 700 mA
Current consumption of SB bus repeat modules : 500 mA×2 =1000 mA
Total: 4720 mA < rated output current of 7.8A
Analog field power supply
Current consumption of NFAI141 : 450mA×2 = 900mA
Total: 900mA < rated output current of 4A
NFAV141 and SB bus repeat modules do not require analog field power and
are thus excluded from the calculation. (E2 bus interface module does not
require analog field power too)
- Calculating current consumption of extension unit
System power supply
Current consumption of NFDV551 modules : 700mA×2 = 1400mA
Current consumption of NFDV557 modules : 550mA×2 = 1100mA
Current consumption of SB bus repeat modules : 500mA×2 = 1000mA
Total: 3500mA < rated output current of 7.8A
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