Siemens SINAMICS Series Operating Instructions Manual page 30

Wizards
Fan staging with PID
this application is used to run several fans in parallel depending on the actual airflow
requirement.
One fan is under direct control and monitoring of the Inverter, the other fans are started and
stopped as required, but no feedback from the other fans is required. The monitoring is
performed by the use of pressure sensors utilizing the PID controller.
The analog inputs are used for setting the setpoint and receiving the feedback from the
various sensors, to which the PID control will react. The digital outputs are used to control
the fans.
Each fan, when started is ran at the minimum frequency; this is done to achieve a uniformed
increase in pressure/airflow without causing a surge in pressure within the system.
Since all fans have the ability to be started and stopped by the Inverter, it is possible to use
the fans in a different number of sequences to ensure that no one fan is working
permanently and the workload is distributed in a balanced manner.
The system comprises of the following components:
● Control Module
● Power Module
● Motor
● Multiple fans
● Pressure sensors
● Temperature sensor (optional)
Pump staging with PID
This application is designed to operate a number of pumps in parallel depending on the
required demand for wwater. This allows the system to react in real-time to the demand
requirements using the minimum investment in hardware.
Several pumps are operated in parallel with a water supply system. One of the pumps is
directly controlled by the Inverter. The remaining pumps, if required, are operated at a fixed-
speed.
The system comprises of the following components:
● Control Unit
● Power Module
● Motor
● Geared motor
● Pumps
● Pressure sensor
● Flow-rate sensor
● Level sensor
● Temperature sensor (optional)
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Operating Instructions, 04/2015, FW V1.5.1, A5E00110011C AB
Intelligent Operator Panel (IOP)