User Manual

Control concept
Superposed plant controls
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Plant Control Editor
The block parameters are set using the Plant Control Editor.
The upper part of the dialog box serves primarily to provide a quick online
overview of the block. The maximum power controlled by the block is set with
the maximum power parameter [MaxPwr]. The value must be greater than 0 kW
in order for the block to work. Any changes in this limit value have a direct
effect in online mode. If no limit value is required, the maximum power must be
set at an appropriately high value.
The Aggregates tab is used to set the control variables of the aggregates
(boiler, refrigeration machine).
● Enable: Activation/deactivation of an entry if they are not released,
aggregates in the Profile table will be ignored.
● Command object reference: Reference (relative addressing) to multistate
value blocks [MVAL] of the relevant energy producer. During the
configuration process, all MVAL blocks at the same and at lower
hierarchical levels are displayed.
● Aggregate description: The reference to the value object provides access to
(and hence, knowledge of) all information in a special dialog box via the
referenced object in the control command.
● Switch-on delay: Delay time when switching from OFF to Stage 1.
● Switch-off delay: Delay time when switching from Stage n to OFF.
● Step-up delay: Delay time when switching from Stage n up to Stage n+1.
● Step-down delay: Delay time when switching down from Stage n to Stage
n–1.
● Switch-on stage power: Power in [kW] at the lowest (that is, first) stage.
● Next power stage: Additional power at the next stage(s) in [kW].
The control sequences for the aggregates (boiler, refrigeration machine) are
defined under the Aggregates tab. Each profile describes the order in which the
energy producers are to be switched and the maximum stage in each case. A
total of 8 profiles each with 15 sequence entries can be defined.
The active profile table is defined by entering the profile number [PrfNr] as an
input parameter, or by selecting it from the Profile dropdown list in the Plant
Control Editor. This input parameter can be interconnected, so that the profile
can be changed as a function of other events (faults, summer mode, boiler
operating hours, etc.). If the profile is changed during operation, the power