EUCHNER CES-AH-C03-AH-SM, Системное руководство, Страница: 10 / 28

System Manual Safety Switch CES-AH-C03-AH-SM
10
Voltage drop on cable and switch
If a load is applied to the outputs, voltage drops will occur on the supply cables
and on the switch.
The voltage drops are to be taken into account during the calculation of the power
available in the load connected.
Parameter Value Unit
Maximum resistance of an output path 50 m W
Resistance for further connection cable (e.g. 7 x 1 mm², supply
and return wire)
5 m W /m
Other connection resistances are to be taken into account as necessary.
Calculation example
10 m cable from the switch to the supply / load
Supply voltage on the 4 V connection
Load on channel A: 1 A
Load on channel B: 4 A
For channel A:
Voltage drop on the switch
D U
1
= R x I = 50 m W x 1 A = 50 mV
Voltage drop on the cable
D U = R
l
x l x I = 5 m W /m x 10 m x 1 A = 50 mV
Voltage at the load
U = U
B
- D U
1
- D U = 4 V - 0.5 V - 0.5 V = 3.5 V
For channel B:
Voltage drop on the switch
D
U
1
= R x I = 50 m
W
x 4 A = 1 V
Voltage drop on the cable
D U = R
l
x l x I = 5 m W /m x 10 m x 4 A = 1 V
Voltage at the load
U = U
B
-
D
U
1
-
D
U = 4 V - 1 V - 1 V = V
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