Version 2.02 15.05.2007
Operating Modes of VS 3000
77
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6.1 Emergency manual-automatic mode selection
Manual-automatic mode selection makes possible emergency manual operation of the refrigeration pack in the
event of pack controller failure. Manual-automatic mode selection is implemented at a relay level subordinate to
the electronic controller. Mode is selected at three positions for each compressor and condenser by switches S1
to S8 installed on the printed circuit board (see illustration below).
Manual control is only available when the controller is in normal operating mode. Relays are not
controlled directly by the switches. Manual-automatic mode selection is equally available on the
extension module (SIOX).
The three switch positions are A - O - I:
A: Automatic ON Compressor stage is switched on and off by controller
O: Manual OFF Manual mode: Compressor stage if OFF
I: Manual ON Manual mode: Compressor stage if ON
When all switches are set to the A position, the controller registers the logic state of AUTOMATIC ON. If a mini-
mum of one switch is set to the I or O position, a message (Comp.Stage OFF S#orComp.Stage ON S#) is en-
tered in the log memory. The message is transmitted according to the preselected priority.
VS 3000
1
I-O-A
2
I-O-A
3
I-O-A
4
I-O-A
1
I-O-A
2
I-O-A
3
I-O-A
4
I-O-A
S1 S2 S3
S4
S5 S6 S7 S8
6.2 Service mode
When choosing Service Mode of (Menu 8) the VS 3000 Pack Controller, all compressor and condenser outputs
are reset stagewise. All controller functions are subsequently inactivated, enabling each digital and analog out-
put to be actuated manually.
The controller registers Service Mode by entering a message in the log memory. The message is transmitted
according to the preselected priority. In Service Mode the controller’s digital and analog inputs ( motor overload
cutouts, low oil pressure cutouts, pressure transducers) are disregarded. Switching commands or output of an
analog voltage signal are carried out directly.
6 Operating Modes of VS 3000
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