Pump Control Options; Pump Control Algorithms; Setting A Pump Down (Wet Well) Group - Siemens SITRANS LUT400 Operating Instructions Manual

Pump Control options

Methods of pump control are dependent on two variables:
Pump start method
Service Ratio setpoints.
Pump duty
indicates whether new pumps start and run with any currently running pumps
(most common) or whether new pumps start and shut off currently running pumps; using
Assist or Backup duty.

Pump Control algorithms

Algorithms are used to provide six modes of pump control. They can be used to start
multiple pumps (assist) or one pump at a time (backup). These six modes can be grouped
into three main methods of pump control used by the SITRANS LUT400: Fixed, Alternate,
and Service Ratio. The LUT420 (Level) model operates with Alternate pump control only.
Starts pumps based on individual setpoints and always starts the same pumps in
Fixed:
the same sequence [Fixed Duty Assist (FDA), and Fixed Duty Backup (FDB)].
Starts pumps based on the duty schedule and always leads with a new
Alternate:
pump [Alternate Duty Assist (ADA), and Alternate Duty Backup (ADB)].
Service Ratio:
Duty Assist (SRA), and Service Ratio Duty Backup (SRB)].
Alternate Duty Assist (ADA) is set as the default.

Setting a pump down (wet well) group

Setting a group of two pumps to pump down a wet well.
sensor ref. point
High Cal. Pt.
Low Cal. Pt.
Setpoint sample values:
(see tables below)
Page 80 SITRANS LUT400 (HART) – OPERATING INSTRUCTIONS
indicates in what sequence pumps are started; using Fixed, Alternate, or
Starts pumps based on user-defined ratio of running time [Service Ratio
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