Siemens 3TM Manuel d'utilisation - Page 31
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Fig. 30
Terminals of the electronic controller
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2019-01-09
•
without exceeding the permissible connector cross-sections
•
under consideration of the potential voltage drops due to long cables
•
with cables routed in an S configuration
•
using suitable fastening elements to secure the cables
If long cables are necessary for control circuits, malfunctions can occur on closing
or opening under certain conditions. The maximum allowable single cable length l
can be calculated based on the following formula:
U S
Rated supply voltage in V
R SL
Ohmic resistance per conductor and km of control cable in Ω/km
u SL
Voltage drop along control cable in %
S close , P close Contactor inrush current in VA/W
cos ϕ close Power factor of contactor solenoid on closing
for direct current
for alternating current
16
Connector for release voltage E1/E2 of latching
21
Connector for supply voltage A1/A2
24
Electronic controller
25
Cover of the electronic controller
5 · U
· u
2
S
SL
(in m)
l
=
R
· P
zul
SL
ein
5 · U
· u
2
S
SL
(in m)
l
=
R
· S
· cosφ
zul
SL
ein
Fig. 31
Optimum cable routing and securing
Installation
all
31