PUMP_AUTOCHANGE

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Function Block PUMP_AUTOCHANGE

General Information
Available as of PLC runtime system V1.3 and above
Included in library PUMP_AC500_V23.lib
Type Function Block without historical values.

The Autochange function can be used to equalize duty time between multiple pumps, by varying the sequence in which pumps are started.

There are three Autochange modes selectable by parameter Autochange style:

  • Fixed intervals: The starting sequence is shifted periodically at pre-defined intervals Autochange interval,
  • Runtime equalization (hours count): The starting sequence is rearranged when the difference between the runtimes of two pumps exceed a limit, runtime difference. In the new sequence, the pump with the lowest runtime will be started first. The pump with the highest runtime will be started last,
  • Autochange when stopped (all stop): The starting sequence for the next start is shifted every time the pump stops.

Example of a change in the sequence by AUTOCHANGE

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Before sequence change: 2 pumps run

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After sequence change: Pump 1 was “oldest” àstandby, 2 pumps run