Siemens HydroRanger 200 Manual de instrucciones descargar pdf (Pagina 246)

Page 232 HydroRanger 200 – INSTRUCTION MANUAL 7ML19981FC01

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Appendix D: Pump Control

First In First Out (FIFO) (P111 = 56)

Selects the lead pump based on the Alternate duty but uses staggered off setpoints and

shuts down pumps based on the first in, first out rule.

This algorithm starts pumps in the same way as Alternate Duty Assist but uses staggered

OFF setpoints to shut the pumps down. When the first OFF setpoint is reached the FIFO

rule shuts down the first pump started. If the pumps started in sequence 2,3,1 then they

would be shut down in sequence 2,3,1.

Pump by Rate (P121)

Starts pumps until the level is changing at the rate specified in P702 or P703.

Pumping costs can be less because only the highest ON setpoint needs to be

programmed and this results in a lower difference in head to the next wet well which, in

turn, results in less energy being used to pump out the well.

Other Pump Controls

There are a number of other controls available to modify pump behaviour.

Pump Run-On (P130, P131)

Extends the RUN period for a pump based on the number of pump starts. This allows for

the wet well to be pumped lower than usual and reduces sludge build-up on the well

bottom.

Pump Exercising (P134)

Runs idle pumps and reduce the chance of seizing.

Wall Cling Reduction (P136)

Varies the ON and OFF setpoints to keep a fat ring from forming around the walls of the

wet well.

Pump Group (P137)

Allows for two different Alternate Duty Assist or Alternate Duty Backup pump groups in

the same application.

Flush Device (P170 to P173)

Operates a flush valve or special flush device based on the number of pump starts,

usually to aerate wet well wastewater.

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Siemens HydroRanger 200 Manual de instrucciones Pagina 246