SIMATIC – ET 200pro motor starters
GWA 4NEB 950 5661-02 DS 04
7-13
7. 5 P o w e r b u s
Load group
All the motor starters supplied via a single power bus infeed are referred to as a
load group. Within a group of motor starters, a renewed power bus infeed can
be required, e.g. so that the rated operating current (summation current) of the
internal power bus is not exceeded.
The summation current of the power bus via the special modules and motor
starters must not exceed a maximum of 25 A.
Current flow via the power bus
The following diagram illustrates the current flow via the power bus with a main-
tenance isolating module and a motor starter as an example:
Figure 7-12: Current flow in the power bus
Warning
In the case of special modules as well as motor starters, unused connections
must be closed off with terminal covers to protect open contacts against dirt
and to reliably seal the ET 200pro to IP65 standard.
Maintenance isolating module Motor starter
Infeed
To l o a d
T1
T2
T3
To lo a d
T1
T2
T3
L1
I2
I3
Jumper
Rear wall bus module Rear wall bus module
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