YOKOGAWA FA-M3V e-RT3 Plus, Hardware Manual

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A3-35
IM 34M06C11-01E
A3.8 Calculating Power Consumption
Although the maximum power consumption is shown in item (1) "Common
Specifications" in Section A2.1, “Specifications,” it actually differs depending on the
number and types of modules installed. Calculate the power consumption according to
the formulae shown below after reading Section A2.9, “Module Current Consumption
Tables.”
Power Consumption (W) =
5 [V]x Σ (dissipating currents of individual modules) [A]
η
[W]
5 [V]x Σ (dissipating currents of individual modules) [A]
η ×COS φ
[VA]
η : Efficiency (approx. 0.65)
COS φ : Power factor (approx.0.4 to 0.5)
5 [V]x Σ (dissipating currents of individual modules) [A]
η
When using an F3PU10, F3PU20 or F3PU30 power supply module
When using an F3PU16, F3PU26 or F3PU36 power supply module
η
: Efficiency (approx. 0.65)
FA030705.VSD
[W]
Power Consumption (VA) =
Power Consumption (W) =
To estimate the temperature increase within the panel enclosure, you need to calculate
the total power consumed within the panel enclosure. To do so, you need to add to the
power consumption of the power supply module described above, the external power
supplied to I/O modules of the FA-M3, as well as the power consumption of peripheral
equipment installed within the panel enclosure.
Some examples for calculation of external power supplied to I/O modules of the FA-M3
are given below.
Example 1: Assume that all points of the F3XD32-3F are ON. Rated current input per
point is 4.1mA, so power consumption at the module is:
4.1 [mA] x 24 [V] x 32 [points] = 3148.8 [mW] = 3.15 [W]
Example 2: Assume that 30 points of the F3YD64-1F are ON with a load current of 0.1A.
For this module, power loss at the output transistors must be considered.
The ON voltage is 0.5V max. and the load current per transistor is 0.1A, so
power loss at transistors is:
0.5 [V] x 0.1 [A] x 30 [points] = 1.50 [W]
The external power supply is 24V/150mA, so power consumption at external
loads is:
24 [V] x 150 [mA] = 3600 [mW] = 3.60 [W]
Example 3: Assume that the F3DA04-1N is used. The external power supply is
24V/180mA, so power consumption at external loads is:
24 [V] x 180 [mA] = 4320 [mW] = 4.32 [W]
For power consumption of peripheral equipment installed within the panel enclosure,
calculate and total the power consumptions of all pieces of the equipment.