General Operation
7.7 Pump Control
SITRANS LUT400
116 Operating Instructions, 07/2019, A5E33329501-AC
1. 8 m (ON setpoint)
2. 2 m (OFF setpoint)
3. 9 m (Peak ON)
4. 8 m (ON setpoint)
5. 6 m (Peak OFF)
6. 2 m (OFF setpoint)
Normal Operation
Uses the standard ON and OFF setpoints (ON Setpoint Pump 1
(2.7.1.6.) (Page 186)/ OFF Setpoint Pump 1 (2.7.1.7.)
(Page 186)). Energy cost is at minimum.
Peak Lead Time (2.7.2.2.2.) (Page 189) = 60 minutes.
Pumps down the wet well regardless of the pump ON Setpoints.
This ensures that the wet well starts the high cost period at the
OFF Setpoint Pump 1 (2.7.1.7.) (Page 186
). Energy cost is at
Peak 1 Start Time (2.7.2.2.3.) (Page 189) = 17:30.
Starts using the energy savings setpoints (Peak ON Setpoint
Pump 1 (2.7.2.2.13.) (Page 192) and Peak OFF Setpoint Pump
1 (2.7.2.2.14.) (Page 192)).
Energy cost is at maximum.
Peak 1 End Time (2.7.2.2.4.) (Page 190) = 21:30.
Returns to normal setpoints (ON Setpoint Pump 1 (2.7.1.6.)
(Page 186) / OFF Setpoint Pump 1 (2.7.1.7.) (Page 186)). En-
ergy cost returns to minimum.
Generally, you would cascade the timing of the pump downs so that the wells farthest from
the treatment facility would begin first and the entire system would push material through
during the low cost period.
Note
When the Peak ON Setpoint is not
reached, no energy is used during the high cost period. If
the Peak ON Setpoint is reached, the Wet Well is only pumped down to 6 m, thereby
minimizing high cost energy usage.
Enable (2.7.2.2.1.) (Page 189)
Enables Energy Savings function
Peak 1 Start Time (2.7.2.2.3.) (Page 189)
Starts the first high cost period at 5:30 pm
Peak 1 End Time (2.7.2.2.4.) (Page 190)
Ends the first high cost period at 9:30 pm
Peak Lead Time (2.7.2.2.2.) (Page 189) 00:60 Sets the pump down to happen 60 minutes
before the high cost period
Peak ON Setpoint Pump 1 (2.7.2.2.13.)
9 Sets the high cost ON setpoint at process
Peak OFF Setpoint Pump 1 (2.7.2.2.14.)
6 Sets the high cost OFF setpoint at process
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