Siemens SITRANS LUT400 - Set Relays to SERVICE RATIO DUTY ASSIST (SRA)

General Operation
7.7 Pump Control
SITRANS LUT400
108 Operating Instructions, 07/2019, A5E33329501-AC
Set the OFF Setpoints
Parameter
Sample Value
Description
OFF Setpoint Pump 1
(2.7.1.7.) (Page 186)
0.4 m Sets the level at which pump 1 turns off.
OFF Setpoint Pump 2
(2.7.1.9.) (Page 186)
0.3 m Sets the level at which pump 2 turns off.
7.7.3.4 Set Relays to SERVICE RATIO DUTY ASSIST (SRA)
Parameter
Value
Description
Pump Control
Mode (2.7.1.5.)
(Page 185)
SRA Sets the control algorithm used to trip the pump relay to
SERVICE
RATIO DUTY ASSIST
. Multiple pumps can run simultaneously.
Pump usage is based on RUN time rather than last used.
Service Ratio
Pump 1 (2.7.1.10.)
(Page 187)
25 Sets the ratio to: 25% for pump 1, i.e. pump 1 will run 25% of the
time.
Service Ratio
Pump 2 (2.7.1.11.)
(Page 187)
75 Sets the ratio to: 75% for pump 2, i.e pump 2 will run 75% of the
time
Set the ON Setpoints
Parameter
Sample Value
Description
ON Setpoint Pump
1 (2.7.1.6.)
(Page 186)
1.3 m Sets the level at which pump 1 turns on.
ON Setpoint Pump
2 (2.7.1.8.)
(Page 186)
1.2 m Sets the level at which pump 2 turns on setpoints
Set the OFF Setpoints
Parameter
Sample Value
Description
OFF Setpoint Pump
1 (2.7.1.7.)
(Page 186)
0.4 m Sets the level at which pump 1 turns off.
OFF Setpoint Pump
2 (2.7.1.9.)
(Page 186)
0.3 m Sets the level at which pump 2 turns off.