Parameters: 25-** Pack Controller - Danfoss VLT Refrigeration Drive FC 103 Programming Manual

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Parameter Description
VLT Refrigeration Drive FC 103

3.20 Parameters: 25-** Pack Controller

3.20.1 25-** Pack Controller
Parameters for configuring the basic pack controller for sequence control of multiple compressors. For a more application-
3 3 oriented description and wiring examples, see Application Examples, Basic Pack Controller in the design guide.
To configure the pack controller to the actual system and the desired control strategy, follow the sequence, starting with
parameter group 25-0* System Settings and next parameter group 25-5* Alternation Settings. These parameters can normally be
set in advance.
Parameters in parameter groups 25-2* Zone Settings, 25-3* Staging Functions, and 25-4* Staging settings often depend on the
dynamic of the system and final adjustments to be done at the commissioning of the plant.
Usually, only parameter groups 25-0* System Settings and 25-2* Zone Settings need adjustment.
NOTICE
The pack controller is supposed to operate in closed loop controlled by the built-in PI controller ([3] Process Closed Loop
selected in parameter 1-00 Configuration Mode). If [0] Speed Open Loop is selected in parameter 1-00 Configuration Mode,
all fixed speed compressors are destaged, but the variable speed compressor is still controlled by the frequency
converter, now as an open-loop configuration:
Illustration 3.64 Pack Controller Sample Set-up
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