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4
3
1
2
3
5
3
2
4
-
6
3
3
6
-
7
3
4
-
-
8
3
5
-
-
9
3
6
-
-
10
3
7
-
-
11
3
8
-
-
12
3
9
-
-
If the suction pressure regulation is speed-controlled, the compressor connected to the FC can
not
be
unloaded using load shedding. If single-stage and multi-stage compressors are in the pack, the single-stage
compressors will be unloaded first.
5.4.7 Emergency power mode
The emergency power mode operating mode can be activated using the
Emerg.working
parameter (menu 3-1).
If the emergency power mode is activated using the above parameter, another entry
No.emerg.stages
is
displayed on the operating screen (menu 3-1). The maximum number of compressor stages permitted to run in
the emergency power mode can be set here. This parameter can be set between the following limits:
•
minimum 1 compressor stage (guarantee of minimum refrigeration capacity)
•
maximum 1 compressor stage less than maximum configuration
If the emergency power mode is selected, it can be activated via the digital input 19 (Load Shedding 3 /
Emergency Power Mode, terminals 86/87), see chapter
Anschluss und Klemmbelegung VS 3010 C
If emergency power mode is activated, all compressors are initially switched off. Afterwards, using the
controller, up to "
No. emerg. stages
" (see menu 3-1) compressors can be activated again.
5.5 High-pressure regulation
The high-pressure is regulated in the controller using a high-pressure valve. The valve is actuated using an
0...10 V signal via the analogue output 3 (terminals 57/58).
The control variable, High pressure pc, is measured using a continuous pressure transmitter with linear
characteristic at the analogue input 4 (terminals 44/45). The setpoint for the regulation is calculated depending
The emergency power operation is signalled from the VS 3010 C to the corresponding case controller
via CAN bus. The addressed case controllers - depending on their parametrisation - then interrupt their
energy intensive processes such as defrosting, cooling, fan etc. Further information about their settings
can be found in the respective operating instructions of the relevant case controller in the chapter
"emergency power mode".
Содержание VS 3015 C
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