ECKELMANN UA 400 - Wiring of the Master-Slave Function for Defrost Synchronization

Firmware V3.15
21.04.2021
125/401
7.14 Wiring of the master-slave function for defrost synchronization
For defrost synchronization via wiring 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.
Basicdiagramforwiringbetweenonemasterandoneormoreslavecase/cold-room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 via wiring are contained
inchapterBrine defrosting.
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Danger of short circuit!Whenwiringmasterandslavecase/cold-room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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