| PID. Systems with one inverter |
The PID control is used in applications where it is necessary to keep one variable, for example the pressure in the water mains, constant in spite of changes in the consumption. The actual value can be selected from analogue inputs, fieldbus or through mathematical functions of these. A direct frequency reference can also be used. |
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| PFC. Systems with 1 inverter, changing over all pumps |
In PFC with Autochange mode the converter can define which pump takes the control and which pumps are auxiliary pumps. The pumps are alternated automatically by the frequency converter, guaranteeing equal usage of the system in all load situations. |
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| MULTIMASTER PFC |
The unique Multimaster PFC application handles PFC logic and autochange with one frequency converter for each pump, providing soft starts and stops also for auxiliary pumps. This in turn results in increased redundancy by allowing the creation of a fully duplicated system from pressure transmitter to pump. Solutions with only one pressure transmitter can also be made. |
| MULTIFOLLOWER PFC |
| The Multifollower PFC application is based on the Multimaster PFC with simultaneous control of all frequency converters instead of one at a time. This results in smoother process control, quieter operation and, in some cases, increased system efficiency. |
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