3: I
NSTALLATION
AND
W
IRING
3-42 FC6A S
ERIES
MICROS
MART
U
SER
’
S
M
ANUAL
FC9Y-B1722
Calculating the Power Consumed by the Main Power Supply
Calculate the power by referring to the values of the modules given in the table in "Internal Power Supply Current of the Modules
and Cartridges" on page 3-39.
■ Examples of Calculating the Power Consumed by Expansion Modules
When the FC6A-R081 is connected to the All-in-One CPU module/CAN J1939 All-in-One CPU module
Calculate the voltage conversion in the CPU module with the following efficiencies.
For the FC6A-R081
24 V (Service Power Supply)
24 V (Internal)
5 V (Internal)
3.3 V (Internal)
90%
70%
P
in [VA]
AC Universal
Voltage [VA]
24 V (Internal)
5 V (Internal)
3.3 V (Internal)
90%
70%
P
in [W]
24V DC
24 V (Internal)
5 V (Internal)
3.3 V (Internal)
90%
70%
Pin [W]
12V DC
5 V 24 V
0.7
P
R081
( I
out
× V
out
) + ( I
out
× V
out
)
=
0.7
+ (0.035 A × 5 V) + (0.006 A × 8 points × 24 V)
( )
0.9 × 5 V
0 A × 3.3 V
=
≈ 1.9 [W]
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