Siemens SITRANS LUT400 Operating Instructions Manual page 191

The methods used to achieve this are:
● Emptying the wet well just prior to the high cost period, regardless of material level (Peak
Lead Time (2.7.2.2.2.) (Page 189)).
● Changing setpoints for high cost and low cost periods (Peak ON Setpoint Pump 1
(2.7.2.2.13.) (Page 192), Peak OFF Setpoint Pump 1 (2.7.2.2.14.) (Page 192), Peak 1
Start Time (2.7.2.2.3.) (Page 189), Peak 1 End Time (2.7.2.2.4.) (Page 190)).
One peak lead time is shared by all five peak zones. When one zone's peak time interval
(difference between peak start time and peak end time) overlaps another zone's peak lead
time, the lead time is chosen over the interval. If a zone's start time matches its end time, the
zone is treated as not configured.
Enable (2.7.2.2.1.)
Enables/disables the Energy Savings feature. The Energy Savings feature is used to
minimize the pumping that occurs during periods of high energy cost.
Options
Peak Lead Time (2.7.2.2.2.)
The time in minutes before the Peak Start Time that the SITRANS LUT400 will begin
pumping.
Values
This value determines when pumping should start to ensure the level is as far as possible
from the ON Setpoint Pump 1 (2.7.1.6.) (Page 186). If level is already within 5% of OFF
Setpoint Pump 1 (2.7.1.7.) (Page 186), no action occurs. If multiple pump stations are series
linked, ensure the Peak Lead Time entered is sufficient to attain the desired level in all
stations before the high-energy cost period occurs.
Peak 1 Start Time (2.7.2.2.3.)
Sets the start time of the high energy cost period 1.
Values
Used in conjunction with Peak 1 End Time (2.7.2.2.4.) (Page 190) to define the high cost
period.
For instructions on how to edit parameters with a string editor, see Using the string editor in
Date and Time (2.14.) (Page 226).
SITRANS LUT400
Operating Instructions, 07/2019, A5E33329501-AC
Range: 00:00 to 23:59
Format: HH:MM (24 hour format, for example: for 5:30pm, set parameter to 17:30)
Default: 00:00
*
Range: 0 to 65535
Default: 60
DISABLED
ENABLED
189