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

General Operation
7.7 Pump Control
SITRANS LUT400
104 Operating Instructions, 07/2019, A5E33329501-AC
7.7.1.1 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.
7.7.2 Setting a pump down (wet well) group
Setting a group of two pumps to pump down a wet well.
①
Low calibration point
②
High calibration point
③
Sensor reference point
④
Inflow
⑤
Level
⑥
Outflow
* ON Setpoint Pump 1 / Pump 2
** OFF Setpoint Pump 1 / Pump 2