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Application planning
3.4 Forming potential groups
3.4.4
Forming potential groups with motor starters
Properties of the 500 V AC infeed bus
The infeed bus has the following properties:
● The infeed bus is assembled by lining up the motor starter BaseUnits "BU30-MSx".
● The infeed bus distributes the energy to the SIMATIC ET 200SP motor starter within one
load group.
● You can open load groups by inserting a 500 V infeed BaseUnit (BU30-MS1, BU30-MS2
or BU30-MS5). With the BaseUnits BU30-MS3, BU30-MS4 or BU30-MS6, you can take
over the infeed bus from the left-hand BaseUnit.
● Via the infeed bus, you have the option of supplying three-phase load groups via L1, L2
and L3 or with single-phase load groups via L and N.
● The permissible voltage range is between 48 and 500 V AC.
● The maximum current carrying capacity is up 32 A (3-phase) at 50 °C and 500 V. Pay
attention to the derating values depending on the configuration.
Properties of the self-assembling voltage bus (L+)
Self-assembling voltage buses have the following properties:
● Maximum current: 7 A
● Rated voltage: 24 V
Pay attention to the derating values depending on the configuration.
The AUX1 bus is not supported in the BaseUnits of the SIMATIC ET 200SP motor starters.
Electric shock when operating the infeed bus without touch protection cover
There is a risk of electric shock when touching the infeed bus if you have not fitted a touch
protection cover on the infeed bus on the right.
Always fit a touch protection cover on the infeed bus on the right (article number: 3RK1908-
1DA00-2BP0).
Electric shock when operating a BaseUnit without an inserted motor starter
If you fit a BaseUnit for motor starters without cover (e.g. option handling), there is a risk of
an electric shock when touching the BaseUnit.
Always fit a cover on the BaseUnit (article number: 3RK1908-1CA00-0BP0).
50
WARNING
WARNING
Distributed I/O system
System Manual, 12/2016, A5E03576849-AG
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