Phoenix Contact IB IL AO 4/U/0-10-ECO Handleiding (190 Pagina's)

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A 6 Calculation examples for power dissipation and

working points

A 6.1 Constant power dissipation of the housing over the

operating temperature range

This calculation is illustrated using the IB IL 24 DO 8-PAC terminal as an example.

Formula to calculate the power dissipation of the electronics

This formula is terminal-specific and is provided in every data sheet.

Where

If no output is set, the component with the sigma sign is omitted.

Example: Load currents of the outputs:

I

L1

= 0.5 A, I

L2

= 0.4 A, I

L3

= 0.2 A, I

L4

= 0.5 A, I

L5

= 0.3 A, I

L6

= 0.4 A

Outputs 7 and 8 are not used.

Power dissipation of the

electronics

According to the formula, the electronics of this specific configuration has the following

power dissipation:

P

TOT

Total power dissipation of the electronics

i Index

n Number of set outputs (n = 1 to 8)

I

Li

Load current of output i

i=1

n

P

TOT

= 0.19 W + ∑ (0.10 W + I

Li

2

x 0.40 Ω)

P

TOT

= 0.19 W + [0.1 W + (0.5 A)

2

x 0.4 ]

+ [0.1 W + (0.4 A)

2

x 0.4 ]

+ [0.1 W + (0.2 A)

2

x 0.4 ]

+ [0.1 W + (0.5 A)

2

x 0.4 ]

+ [0.1 W + (0.3 A)

2

x 0.4 ]

+ [0.1 W + (0.4 A)

2

x 0.4 ]

P

TOT

= 0.19 W + 0.200 W + 0.164 W + 0.116 W

+ 0.200 W + 0.136 W + 0.164 W

P

TOT

= 1.37 W

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