ECKELMANN UA 400 - Page 42

Firmware V3.15
21.04.2021
42/401
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Alarm signalling when defrost is not performed
The "No Defrost”messageisoutputbyboththemasteraswellastheslavecontrollerifthedefrostwasnot
performed . The output of this message is linked to the delay time for this alarm and is therefore automatically
sentbyallaffectedcontrollersifnodefrosttakesplace.Inmaster/slaveoperationthealarm“No Defrost“can
also mean that a slave no longer has any contact to the master. If a slave fails to receive a signal from its
defrost master for a period longer than 60 minutes, then this message is generated.
Special cases/useful information
The master/slave defrost via CAN bus cannot be used together with the wired variant of the master/slave
defrost.
UA 400 / UA 400 E mixed operation is possible with both the master/slave defrost (MSD) and the
consecutive defrost (CD).
Once a defrost has been initiated on a slave, this can only be interrupted when the parameter 2-2-1 (Defrost
1)–“M/S Abt Fkt.”ontheslaveissetto“OFF”foraminimumof10secondsandthenresetto“Slave”.In
general, this procedure is only recommended for commissioning situations, as an interruption in defrosting
can result in increased icing.
SlaveswiththeM/SCANaddress=“—“canhaveexternaldefrostsources
SlavewithM/SCAN-Address“—“->defrostviaINT/EXTpossible
The master does not start the defrost of the slaves if it has already reached the defrost termination
temperature.
Even if all the slaves have already reached their defrost termination temperature, they do not switch to
coolinguntiltheendofthedelaytime.
Themasterdoesnotswitchonthedefrostheater(=relayisNOTactivated)ifitisalreadytoowarm.
Safe defrost, delay and drip times are transmitted to the slaves from the master during both a master/slave
defrost (MSD) and a consecutive defrost (CD) and are used irrespective of the slave parameters set by the
user.