Automation solution – Set 23
The automation solution uses a LOGO! logic module with a connected SIMATIC
S7-1200 and in the TIA Portal, a KTP600 Basic color PN simulated as runtime
version to emulate the controlled system.
A PI controller in the LOGO! logic module adjusts the pressure by varying the
motor speed depending on the pressure that is being measured. The pressure of
the cooling water system is thus kept constant, independent from the number of
consumers. The cooling performance is optimized and failures caused by a
shortfall of pressure are prevented.
The motor is connected to a SINAMICS V20 frequency converter, which receives
the setpoint motor speed as a frequency setpoint via the analog output of the
LOGO! expansion module AM2 AQ. The speed of the asynchronous motor is
adjusted steplessly via the SINAMICS V20. The motor and the SINAMICS V20 are
not mandatory for the simulation.
A SIRIUS wire electrode for level-monitoring is connected to a SIRIUS monitoring
relay. This is to ensure and monitor that the pump is supplied with fluid during
operation. The monitoring status of the SIRIUS monitoring module is transmitted to
a digital input of the LOGO! logic module.
The current pressure at the cooling water system, the setpoint pressure and the
operating hours of the pump can be directly displayed in an external LOGO! TD.
The setpoint value of the cooling water system can also be edited. On an
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