Festo FB16 Electronic Manual page 175

VIFB16 - 03/05
0506b
Appendix A
Formula for calculating cable lengths:
( V − V
Omin
L ≤
This means:
•
21.6 V: V
TERMINAL
minimal: V
TERMINALmin
•
V = Minimum operating voltage
Omin
supply (at power unit)
•
Current I = Current for electronic
1
components and inputs
•
Current I = Current for outputs/valves
2
•
A = Cable cross section
(uniform e.g. 1.5 mm
•
κ = Conductance value of cables
(uniform e.g.
Example
I
1
I
2
V
Bmin
V
TERMINALmin
κ
Cu
Result
L ≤ 18 m for A = 1.5 mm
L ≤ 30 m for A = 2.5 mm
) ⋅ A ⋅
TERMINAL min
2 ⋅ I + I
2 1
= 24 V ± 10%,
≥ 21.6 V
2
)
m
κ
= 56
Cu
2
mm
= 1 A;
= 5 A;
= 24 V;
= 21.6 V ;
m
= 56
2 ⋅ Ω
mm
2
2
κ
Cu
)
⋅ Ω
;
A-11