Siemens SITRANS LUT400 - Set Relays to SERVICE RATIO DUTY BACKUP (SRB)

General Operation
7.7 Pump Control
SITRANS LUT400
Operating Instructions, 07/2019, A5E33329501-AC
109
7.7.3.5 Set Relays to SERVICE RATIO DUTY BACKUP (SRB)
Parameter
Value
Description
Pump Control
Mode (2.7.1.5.)
(Page 185)
SRB Sets the control algorithm used to trip the pump relay to
SERVICE
RATIO DUTY BACKUP
. Only one pump can run at a time. Pump
usage is based on RUN time rather than last used.
Set the Service Ratio for each pump
Parameter
Value
Description
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.
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.