Application planning
3.3 Hardware configuration
Distributed I/O system
42 System Manual, 12/2016, A5E03576849-AG
Maximum electrical configuration for motor starter infeed bus (500 V AC)
To determine the current requirement of an individual motor starter via the infeed bus,
proceed as follows:
Calculate the current requirement via the main current paths of the individual motor starter.
In doing so, take into account the parameter I
e
(set rated operational current of the motor
starter). The permissible overload characteristics of the motor feeder for motors are
determined with the thermal motor model. You calculate the current value (I
infeed bus
) for the
infeed bus of the ET 200SP system according to the following formula:
I
infeed bus
= ∑
n
(I
e
* 1.125)
n = number of motor starters of a potential group on the infeed bus
Refer to the Manual (https://support.industry.siemens.com/cs/ww/en/view/109479973) for
details of how to assign the basic rated operational current I
e
parameter.
The following values apply for the potential group of the AC infeed:
● The maximum current carrying capacity is 32 A at an ambient temperature of up to 50 °C.
● The maximum current carrying capacity is 27 A at an ambient temperature of up to 60 °C.
● The maximum current carrying capacity for applications according to UL requirements is
24 A at an ambient temperature of up to 60 °C.
The address space depends on the CPU/interface module (see CPU
(http://support.automation.siemens.com/WW/view/en/90466439/133300) Manual) and the
interface module used (see Interface module
(http://support.automation.siemens.com/WW/view/en/55683316/133300) Manual):
● For PROFINET IO: Dependent on the IO controller/IO device used
● For PROFIBUS DP: Dependent on the DP master used
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