ECKELMANN UA 400 - Page 49

Firmware V3.15
21.04.2021
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Execution i.e. sequence of the defrost sequence
Adefrostisinitiatedonthemastercontrollerforthedefrostsequence(DSmaster).
The DS master initiates a defrost of all the DS slaves in group 1. If there are no DS slaves with the group
number 1, then the DS master defrosts alone. All the controllers (DS slaves) with other DS group numbers
continuetooperateintheirnormalcoolingmode.
IfthedefrostterminationtemperatureisreachedbyallthecontrollersoftheDSgrouportheirsafedefrost
times have elapsed, then the DS master initiates a defrost for the next highest DS group number.
If a delay time "DS-Wait time" (menu 2-2-1, i.e. menu 2-2-2) has been parameterized then the start of the
defrostsequenceforthesubsequentDSgroupisdelayedaccordingly.
The defrosts are continued until the entire chain of controllers has been run through. The defrost sequence is
now finished and all controllers have resumed cooling.
Configuration / parameterization of defrost sequence
Thedefrostisparameterizedinmenu2–Setpoints–2DefrostZone1.
The first thing to be configured is the function of the controller with respect to the defrost sequence (master or
slave, i.e. OFF if the controller is not to participate in the defrost sequence, parameter "DS-Function").
InthecaseoftheslavesthecorrespondingDSgroup(parameterDS-Group) and the CAN bus address of the
DSmaster(parameterDS-Master) must be set. The DS master is automatically in DS group 1, if it is set to a
different group this has no effect on the master. Furthermore, the delay time between two group defrosts must
be set on the DS master.
Example: Configuration of a defrost sequence
Start of defrost
In the case of the DS master controller a defrost is activated via the internal clock, the external contact or via
manual defrost (CAN/local).
Configuration of the group members
Withrespecttotheparameter"DS-Function", the DS master must be set to "Master". The parameter "DS-Wait
time" specifies the delay time in minutes which the DS master maintains between the defrosting of two groups.
The delay time applies unchanged across all groups.
The parameters "DS-Group" and "DS-Master"areignoredbytheDSmasterandshouldbesetto"--".
With respect to the parameter "DS-Function",theDSslavesmustbesetto"Slave".
On the slaves the parameter "DS-Group" must be set so that the controller is defrosted in the desired group
with other controllers and/or in the desired sequence relative to other controllers. For purposes of clarity, the
group numbers should be assigned in ascending order and without omissions along with the CAN bus address,
howeverthisisnotobligatory.
With the parameter "DS-Master" the CAN bus address of the DS master is set for every slave. This specifies
which of the controllers coordinates/executes the defrost. The parameter "DS-Wait time" is ignored by the DS
slave and should be set to "-". Similarly, the parameters for the defrost timer should be configured so that no
additional defrosts occur on the slave if no additional defrosts are desired outside of the defrost sequence. To
this end, it is recommended to set all the defrost times to "-" and the parameter "Defrost Timer" to "INT" (menu
3-2).
TheDSmasteralwaysbelongstoDSgroup1!
