Application planning
4.5 Forming potential groups
Distributed I/O system
System Manual, 09/2019, A5E03576849-AJ
57
4.5.4 Forming potential groups with motor starters
Overview of the functions of the BaseUnits
24 V
continu-
ation
from left
module
500 V
continu-
ation
from left
module
F-DI
continu-
ation
from left
module
3RK1908-0AP00-0DP0 -- ✓ ✓ -- ✓ ✓ -- -- --
Function available
-- Function not available
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 plugging in a 500 V infeed BaseUnit (BU30-MS1, BU30-
MS2, BU30-MS5, BU30-MS7 or BU30-MS8). With BaseUnits BU30-MS3, BU30-MS4,
BU30-MS6, BU30-MS9 or BU30-MS10, you can continue the infeed bus from the left
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.
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