Siemens 3TM Operating Instructions Manual page 32

Installation
Calculating the connection
Fig. 34 Terminals of the electronic controller
32
In the case of long supply lines for the control circuit, malfunctions may occur on
wire these supply lines when switching on, due to too high voltage drops.
As a yardstick, the maximum length of the connection wire can be calculated accord-
ing to:
L = 0.004 x U2 x A
Here,
L: Length of connection wire in m
U: Rated supply voltage in V
A: Connector cross-section in mm
16 Connector for release voltage E1/E2 of latching
21 Connector for supply voltage A1/A2
24 Electronic controller
25 Cover hood of the electronic controller
2
Fig. 35 Optimum cable routing and securing
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2020-09-18