Saving Energy - Siemens SITRANS LUT400 Series Operating Instructions Manual

Saving energy

Pumps can use different setpoints at different times of the day to account for variable
energy costs.
The following example illustrates high energy cost usage reduction and/or elimination by
using the SITRANS LUT400 Energy Savings function on a wet well (pump down
application) using pump 1.
Pre-requisite: enable Energy Savings function (set
15:30
(3:30 pm)
16:30
(4:30 pm)
17:30
(5:30 pm)
21:30
(9:30 pm)
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.
When the Peak ON Setpoint is not reached, no energy is used during the high
Note:
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.
Parameter
2.7.2.2. 1 . Enable
2.7.2.2.3. Peak 1 Start Time
2.7.2.2.4. Peak 1 End Time
2.7.2.2.2. Peak Lead Time
2.7.2.2.13. Peak ON Setpoint
Pump 1
2.7.2.2. 1 4. Peak OFF Setpoint
Pump 1
A5E33329501
8 m (ON setpt.)
2 m (OFF setpt.)
8 m (ON setpt.)
2 m (OFF setpt.)
9 m (Peak ON)
8 m (ON setpt.)
6 m (Peak OFF)
2 m (OFF setpt.)
9 m (Peak ON)
8 m (ON setpt.)
6 m (Peak OFF)
2 m (OFF setpt.)
Value
Enabled
17:30
21:30
00:60
9
6
SITRANS LUT400 (HART) – OPERATING INSTRUCTIONS
2.7.2.2. 1 . Enable
= Enabled)
Normal Operation
Uses the standard ON and OFF setpoints (
ON Setpoint Pump 1 2.7.1.7. OFF Setpoint Pump 1
/
Energy cost is at minimum.
2.7.2.2.2. Peak Lead Time
Pumps down the wet well regardless of the pump
ON Setpoints. This ensures that the wet well
starts the high cost period at the
Setpoint Pump 1
. Energy cost is at minimum.
2.7.2.2.3. Peak 1 Start Time
Starts using the energy savings setpoints
2.7.2.2. 1 3. Peak ON Setpoint Pump 1
(
Peak OFF Setpoint Pump 1
Energy cost is at maximum.
2.7.2.2.4. Peak 1 End Time
Returns to normal setpoints (
Pump 1 2.7.1.7. OFF Setpoint Pump 1
/
Energy cost returns to minimum.
Description
Enables Energy Savings function
Starts the first high cost period at 5:30 pm
Ends the first high cost period at 9:30 pm
Sets the pump down to happen 60 minutes
before the high cost period
Sets the high cost ON setpoint at process level
of 9 m
Sets the high cost OFF setpoint at process level
of 6 m
2.7. 1 .6.
).
= 60 minutes.
2.7.1.7. OFF
= 17:30.
2.7.2.2. 1 4.
and
).
= 21:30.
2.7. 1 .6. ON Setpoint
).
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