Calculating With A Formula - Festo FB16 Electronic Manual

VIFB16 - 03/05
Operating voltage supply
V
B
AC
DC EMERG. STOP
0 V
Distance (cable length)
Fig. A/3: Cable length (L) and line resistance (R
A-10
Appendix A

Calculating with a formula

Proceed as follows:
1. Calculate the maximum current consumption
of the inputs and electronic components (I
as well as of the outputs/valves (I
2. Calculate the lowest voltage to be expected
on the power unit during operation (V
Take into consideration:
• the influence of load variation of the power
unit
• the fluctuations in the primary
mains voltage.
3. Enter the values in the appropriate formula.
The replacement circuit diagram and the ex-
ample explain the process.
3.15 AT
10 AT
L
Replacement circuit diagram
Valve
terminal
I
1
Pin 1
Pin 2
I
2
Pin 3
I
0
).
2
V
Line
B
resistance
(incoming)
V
L1
R
R
L1
L2
R
R
I1
I2
R
V + V
L0
L2 L1
Line
resistance
(returning)
0 V
L)
)
1
).
Omin
V
L2
V
terminal
0506b