Main Menu - Pack Controller - Group - Danfoss VLT FC 103 Programming Manual

Parameter Description

3.19 Main Menu - Pack Controller - Group

25
3.19.1 25-** Pack Controller
3 3
Parameters for configuring the Basic Pack Controller for
sequence control of multiple compressors. For a more
application oriented description and wiring examples, see
section Application Examples, Basic Pack Controller.
To configure the Pack Controller to the actual system and
the desired control strategy, it is recommended to follow
the below sequence, starting with System Settings,
parameter group 25-0*, and next Alternation Settings,
parameter group 25-5*. These parameters can normally be
set in advance.
Illustration 3.62
150
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VLT Refrigeration Drive Programming Guide
Parameters in Zone Settings, 25-2*, Staging Functions, 25-3*
and Staging settings, 25-4*, will often be dependent on the
dynamic of the system and final adjustment to be done at
the commissioning of the plant.
In most cases, only 25-0* and 25-2* will need adjustment.
NOTE
The Pack Controller is supposed to operate in closed loop
controlled by the built-in PI controller ([3] Process Closed
Loop selected in 1-00 Configuration Mode). If [0] Speed Open
Loop is selected in 1-00 Configuration Mode, all fixed speed
compressors will be destaged, but the variable speed
compressor will still be controlled by the frequency
converter, now as an open loop configuration:
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