ECKELMANN Case Controller UA 4 E Series, Operating Instruction

Page: 78 / 466

Firmware V3.13 21.04.2021 78/466
5.8.5.1 Master-slave mode for the synchronisation of the zones of a single contr.
Function description
Master configuration:
With the case controller the internal defrost timer must be active (menu 3-2, parameter
Defrost Timer = INT). This case controller is then designated as the master.
On reaching the defrost end temperature for the respective zone the defrost relay is switched off. Cooling is
only resumed once all the control zones have completed the defrost or the safe defrost time has elapsed.
Example: Synchronized defrost termination on one controller with two temperature zones.
In standard operation with two temperature zones, the defrost in each zone is terminated dependent on the
defrost termination sensor of the respective zone and immediately switched to cooling. If in contrast, an
operating mode is required where both zones simultaneously switch to cooling following the defrost, then the
master/slave function on DIP switch 3 of coding switch 4 also needs to be set to ON.
Cooling will then not be resumed until defrosting is terminated in both zones. The defrost heater relay is still
operated separately for each zone according to temperature on the defrost termination sensor.
The special features and restrictions for the master now apply, see chapter
Master-slave mode for the
synchronisation of the zones of a single contr.
Further details of special features and restrictions are provided in chapter Master-slave mode for the
synchronisation of the zones of a single contr. .
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