ECKELMANN VS 3000 User Manual

Version 2.02 15.05.2007
Function of VS 3000
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3.34 Monitoring external alarm / speed adjuster
An external alarm can be forwarded via Digital Input 15 of the controller. When the input is de-energized, the
alarm is transmitted after a definable time delay according to the preselected priority. The input has no effect on
control functions of the controller.
When operating the controller with HP control defined as step switch, this input is available for free use to for-
ward user-defined alarms. The message text can be entered in Menu 3 -6 Alarm message. The default text
loaded on first start is External Alarm.
When operating the controller with LP control defined as combined controller, the function of this input is prede-
fined as the input to record faults on the compressor control frequency changer. In this instance the alarm text is
predefined, as Speed Adjuster.
3.35 Disabling refrigeration points
In the occurrence of a fault on the compressor pack, the pack controller can transmit a refrigeration point disable
signal to all associate refrigeration points. The associate refrigeration points are case/coldroom controllers on
which the node address of the pack controller has been programmed in the controller configuration.
The refrigeration point disable signal is sent to all associate refrigeration points when no compressor or refriger-
ation capacity is available. Possible causes of failure are:
- Tripping of high-pressure cutout
- Tripping of all motor overload cutouts
- Tripping of all low oil pressure cutouts
- Manual shutdown of all compressors
Refrigeration points are not disabled in the event of a low-pressure fault due to low suction pressure or tripping
of the LP cutout. Additionally, a refrigeration point enable signal is supplied through Digital Output 9 to allow of
incorporating external controllers.
3.36 Discharge gas defrosting
Discharge gas defrosting ( D2D) is a method of passing compressed vapor from the compressor through evapor-
ators for the purpose of defrosting them. It may be performed with either hot gas taken from the discharge line
upstream of the c ondenser or cold gas taken from the receiver located downstream of the condenser.
Discharge gas defrosting as described herein is a two-pipe D2D system that can only be performed
with hot refrigerant gas. Otherwise a risk is entailed of liquid refrigerant being drawn in by the com-
pressors.
Two compressor packs and accordingly two VS 3000 Pack Controllers are required to perform discharge gas defrost-
ing. They are here termed Z1 Pack and Z2 Pack. The pack controller performing defrost by D2D and controlling the
defrost sequence is termed Z2-VS3000. The pack controller that does not perform D2D defrost and provides for sup-
ply of the discharge gas is termed Z1-VS3000.
Discharge gas defrosting can be carried out for an NT or LT refrigeration compressor pack, i.e. Z2 Pack working in
either the NT or LT range. The pack supplying the discharge gas, i.e. Z1 Pack, always works in the NT range. Alloca-
tion of case/coldroom controllers to the Z1 or Z2 range is made exclusively by defining the CAN bus Node No. of the
associate Z!-VS3000 or Z2-VS3000 pack controller on the case/coldroom controller (see description of UA 300 Case/
Coldroom Controllers).

ECKELMANN VS 3000 Specifications

General

Brand	ECKELMANN
Model	VS 3000
Category	Controller
Language	English