5.5.7 Defrost sequence (DS) via CAN bus
All controller types from version >= V 4.00
Function description
Defrost sequins (DS) via CAN bus covers the following functions:
Different refrigeration points, organised into groups, are to start their defrost at different times. A common
application is the temporal distribution of the energy requirements generated by the defrost, together with the
shortest possible total defrost time for the store. Simultaneously, the total time required for the completion of all
the participating defrosts is kept as short as possible.
As soon as one of the defrost groups has completed its defrost, then the next group can start it's defrost. A
delay time can be specified for the period between two defrosts. The organisation of the defrost groups is
carried out by the defrost sequence master (DS master). All other participants in the defrost sequence are
called defrost sequence slaves (DS slaves).
It is possible to deploy several independent defrost sequence masters within one CAN bus segment. In addition
to the groups of defrosting controllers, there can be further controllers within the E*LDS system which
independentlyconductadefrost.
The number of DS masters as well as the number of controllers assigned to them is only limited by the
maximumnumberofparticipantsintheE*LDSsystem.
Within a defrost sequence system (master and its assigned slaves) the sequence is established by group
numbers. The allocated group numbers are defrosted in ascending order beginning with group number 1. If
several controllers assigned to a DS master have the same group number, then they are termed a group (DS
group) and are defrosted at the same time. The group with the next group number is only defrosted when all the
participants in the previous group have completed their defrost.
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