Siemens SITRANS LUT400 Series - Pump Control Options; Pump Control Algorithms; Setting a Pump down (Wet Well) Group

Page 80 SITRANS LUT400 (HART) – OPERATING INSTRUCTIONS A5E33329501
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General Operation
Pump Control options
Methods of pump control are dependent on two variables:
Pump start method indicates in what sequence pumps are started; using Fixed, Alternate, or
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.
Fixed: Starts pumps based on individual setpoints and always starts the same pumps in
the same sequence [Fixed Duty Assist (FDA), and Fixed Duty Backup (FDB)].
Alternate: Starts pumps based on the duty schedule and always leads with a new
pump [Alternate Duty Assist (ADA), and Alternate Duty Backup (ADB)].
Service Ratio: Starts pumps based on user-defined ratio of running time [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.
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SITRANSLUT400
SITRANS LUT400
Low Cal. Pt.
sensor ref. point
inflow
outflow
High Cal. Pt.
level
*
* ON Setpoint Pump 1 / Pump 2
** OFF Setpoint Pump 1 / Pump 2
Setpoint sample values:
(see tables below)
**