ECKELMANN Case Controller UA 4 E Series - Wiring of the Master-Slave Function for Defrost Synchronisation

Firmware V3.13
21.04.2021
175/466
7.13 Wiring of the master-slave function for defrost synchronisation
For defrost synchronisation the auxiliary contactors of the master defrost relay are switched in parallel and
thenroutedasa230Vsignaltotheslave’sexternaldefrostinput(terminalsD11/D12).Theauxiliarycontactors
oftheslavecontrollerarealsoconnectedinparallelandconductedbackasa230Vleveltotheexternal
defrostinputofthemaster.Thisenablesthesoftwaretodeterminewhetherdefrostingisstilltakingplacein
both case controllers.
Warning - hazardous electrical voltage!
Danger of electric shock! BEFORE and AFTER connection it must checked that the 230 V AC digital
inputs are off load!
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The description and operating instructions for the master-slave mode are contained in chapter Master/
slavemode–defrostsynchronisationviawiring.
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Danger of short circuit! When wiring master and slave case/coldroom controllers, make sure that
power supply is made with only one phase (e.g. only through L1, see illustration)!
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Defrosting is terminated by the software not later than when the set safe defrost time expires. The
external clock must be wired as a passing contact as it only provides the start signal for the defrosting.
The shutdown is entirely managed by the participating controllers according to their safe defrost time.
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