Function of CI 3000
30
Version 2.09 09. April 2014
LSM is then able to recognize whether the unit is in fact working and contributing to peak demand and whether it
responds to the load shedding command. For this operating mode a digital relay input and output on the SIOX
extension module (SIOX 1 .. 4) is required for each consumer. Each load shedding stage can be configured with
the following parameters (see Screen 6-1-6-3-2).
M bus meters connected to the store computer cannot be used for the LSM, the digital inputs of the
store computer, i.e. those of the SIOX are exclusively reserved for this purpose.
Stage shed load
Maximum electrical load for the stage must be configured by parameter (Load), which is used to calculate the
stages to be shed. Stages for which the shed load is set to 0 are also shed according to their priority (se
quence). This may result in unfavorable switching actions for a time. The correct maximum shed load should
therefore be set for each load shedding stage used so as to ensure optimum LSM operation.
Minimum run time
This parameter can be used to configure a minimum run time. The minimum run time defines the minimum time
for which a stage must be active before it may again be shed. Setting a time (greater than 0), determines
whether a stage can be shed. The time must be set to 0 if limitation of shedding by minimum run time is not to
be used.
Minimum shed time
This parameter can be used to configure minimum duration of load shedding. It defines the minimum time for
which a stage remains shed before it can be loaded again. If the parameter is set to 0, it has no effect on LSM
function. An input can be used and configured for each load shedding stage to signal operating status of the as
sociate electric load. This input is optional. When used, it allows significantly better load optimization. If the input
is not configured for a stage, the electric load will always be assumed to be operating. The operating input acts
only on load shedding for the respective stage.
Maximum shed time
This parameter can be used to configure maximum duration of load shedding. The time begins on shedding a
stage. On elapse of the defined maximum shed time, the stage is again loaded regardless of the power demand
or load shed state at that time. Maximum shed times are detected and processed separately for each stage.
Setting the parameter to 0 deactivates the function and load shed time is not limited.
Load shed output
A load shed output must be configured for each load shedding stage and is used to shed the respective electric
load. Shedding of a stage or load takes place through an active load shed output. A stage will not be shed if no
output is configured for it.
Operating input (optional)
For each load shedding a digital input for signalling the operating status of the corresponding consumer can be
used and configured. The operating input communicates the current operating status (ON/OFF) of the load to
LSM. When used, it allows significantly better load optimization by enabling LSM to optimize demand stage on-
and off-cycling. If the input is not configured for a stage, the electric load will always be assumed to be operat
ing. The operating input acts only on load shedding for the respective stage.
Power demand input (optional)
For each load shedding a digital input for signalling the power requirement of a consumer can be used and con
figured. The demand input signals to LSM the power demand status (YES/NO) of the respectively shed load
stage and whether the total power will increase by this demand when enabled. When used, it allows significantly
better load optimization by enabling LSM to determine an optimum load shedding strategy. If the input is not
configured for a stage, the electric load will always be assumed to be demanding power. The demand input acts
only on loading of the respective stage.
Careful planning and startup is vital to successfully installing and configuring load optimization man
agement. The basis for planning is formed by application- and plant-specific information supplied by
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