UM EN AXL E SYS INST
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PHOENIX CONTACT 8395_en_03
Losses on cables
The voltage drop on the cables can be calculated using the following formula:
U
A
= I x R x 2
Where:
For a power supply cable of 4 x 0.75 mm², cable type 186
(e.g., SAC-4P-M12MS/...-186/M12FS), the conductor resistance is 26 /km.
At 4 A:
At 2 A:
Other cables have other specific resistance values. These values can be used to calculate
the voltage drop according to the above formula.
4.9 Connecting sensors and actuators
Connect the sensors and actuators using M12 connectors.
U
A
Voltage drop
I Current strength
R Conductor resistance
2 Calculation for forward and return path
U
A
= 4 A x 26 /km x 2 = 208 V/km which corresponds to 2.08 V on 10 m
U
A
= 2 A x 26 /km x 2 = 104 V/km which corresponds to 1.04 V on 10 m
NOTE: Damage to the electronics
In general, the maximum current load of 4 A per contact must not be exceeded.
For the pin assignment of inputs and outputs, please refer to the device-specific data
sheet.
Phoenix Contact recommends using pre-assembled cables.
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