Name: Enter custom description for meter
Window Size: [Visible only when demand limiting set to yes] The
window width is set to 15, 20, or 30 minutes. Every minute, the
window “slides” forward so that it always contains the most
recent period of time. Each minute the accumulated KW during
that minute is recorded.
Watt-hours per pulse: Enter relevant value- Watt-hour per pulse
Collect History: Select yes to collect history from this meter
Use for demand limiting: Whether or not this meter is to be
used for demand limiting.
Normal Load 01 - 24 Hrs: Enter the upper demand limit you do
not wish to exceed for the given hour of the day (dened by each
hour line) under normal operating conditions (when using normal
power). There is one eld for each hour of the day, from 01 to 24.
Maximum Emergency Load: Enter the upper demand limit that
you do not wish to exceed when the emergency generator is
running.
Start Shedding at: Enter the percent of maximum load at which
you want to start shedding loads.
Start restoring at: Enter the percent of maximum load at which
you want to start restoring loads which have been shed.
Enable coupling switch: In installations where there are two
transformers and/or two emergency generators, a coupling
switch can be used to connect both loads to one source in case
the other source fails.
Number of normal steps: The number of steps (levels) which
you will allow to be shed under normal conditions.
Number of emergency steps: The number of steps (levels)
which you will allow to be shed when the emergency generator is
running.
Normal:
Soft start begin level: 0 to the number of normal steps set
above, up to 10; if 8 normal steps are congured, for example,
the upper limit of this entry is 8) This entry species the level
down to which loads will be turned on when the emergency
generator starts. A level will be added each minute unless the
specied emergency load for shedding to start is reached.
Couple begin level: [Visible when coupling switch = yes]
Emergency generator control - Enter the upper demand limit
you do not wish to exceed for the given hour of the day under
normal operating conditions (when using normal power).
There is one eld for each hour of the day, from 00 to 23. This
screen has two pages in order to list all the hours of the day.
Emergency:
Soft start begin level: [Emergency generator control] 0 to
the number of emergency steps set above, up to 10; (if 8
emergency steps are congured, for example, the upper limit
of this entry is 8) This entry species the level down to which
loads will be turned on when the emergency generator starts.
A level will be added each minute unless the specied
emergency load for shedding to start is reached.
Coupling begin level: [Emergency generator control] Enter
the upper demand limit you do not wish to exceed for the
given hour of the day under normal operating conditions
(when using normal power). There is one eld for each hour of
the day, from 00 to 23. This screen has two pages in order to
list all the hours of the day.
Note about soft starts
The eect of a soft start is to slowly add load to the generator after
it starts. If, for instance, soft start begin level is set to 6, when the
generator starts only refrigeration loads and loads assigned level
7 through 11 will be on. After one minute, if the load is below the
“start shedding at” percentage of maximum emergency load, level
6 will be turned on. After another minute, the same decision will
be made for level 5, and so on down to level one. If at any time
the load reaches the “start shedding at” percentage, load shed-
ding will begin again until the system reaches the “start restoring
at” percentage.
DEMAND LIMITING TAB (see dedicated section on Demand
Limiting)
58 User Guide Lit. no. USCO.PI.R1.E1.02 © Danfoss 07-2013 AK-SM 850
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