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Entry type: Application example Entry ID: 37604154, Entry date: 03/02/2021

Simple networking and cascading of drives with S7-1200, SINAMICS G120X and USS

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  • Associated product(s)
Cascaded asynchronous motors are running at SINAMICS G120X or G120XA type frequency converters and a SIMATIC S7-1200 CPU controls the inverters via USS-protocol.

Automation task
A water user shall be supplied with water on demand via four pumps. Four asynchronous motors drive one pump each. Assuming an output of 100% for each pump, an output of 400% is to be generated by cascading all four pumps.
By switching pumps on and off an equal load for all pumps shall be ensured taking into consideration the operating times. The pumping output of a pump which has been released for maintenance shall be automatically taken over by a pump with free capacity.
Apart from the above described automatic operation, it shall also be possible to operate each pump manually.
In order to take into consideration the various pump types, it shall be possible to operate all pumps in positive and negative direction. The plant shall be operated via a monochrome Touch Panel.

Automation solution  
The 4 asynchronous motors are controlled with one SINAMICS G120X or G120XA type frequency converter each.
In order to minimize the wiring expenses between the S7-1200 communication module CM 1241 and the frequency converter, the SINAMICS G120X with integrated bus interface (RS485 with USS protocol) was selected as a frequency converter. This allows control of all 4 frequency converters via S7-1200 CPU 1214C.
The compact controller S7-1200, CPU 1214C is configured via the programming user interface STEP 7 V16, which enables the integration of an USS library, included in delivery, for simple controlling of the frequency converter.
The KTP 600 touch panel represents the user interface for the operator. Configuration is also carried out using STEP 7 V16.

Startup Code
For the startup we offer you software examples with test code and test parameters as download. These software examples support you in the first steps and tests of the configuration examples. They enable a quick test of hardware and software interfaces of the products described in the configuration example.

  Documentation (3,0 MB)
  TIA Portal V16 project (4,3 MB)

Further Information
S7-1200 System manual

Last changes
03/2021 Updated with TIA Portal V16 and SINAMICS G120X

Additional Keywords
Set 8

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