ECKELMANN Case Controller UA 4 E Series - Page 81

Firmware V3.13
21.04.2021
81/466
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Configuration
The master-slave function can be employed with all controller types. In order to activate the master/slave mode
DIPswitch3oncodingswitch4mustbeswitchedtoONonallparticipatingcasecontrollers.Thechangeis
onlyadoptedwhenthecontrollerisrestarted(switchedoffandbackonagain).
The following items must definitely be observed to ensure correct operation.
Whenusinganexternaldefrosttimeronamasteritsinternaldefrosttimershouldbesetto“—“.Ifthisis
notthecasethentheinternaldefrosttimewillbetakenintoaccountalongwiththeexternaldefrost.The
signalfromtheexternaldefrosttimermayonlybeemployedasanimpulse(>10seconds)fortheinitiation
ofthedefrost.Inordertoconfigurethemaster’sdefrosttimertheparameterDefrostTimer=INTmustalso
beset,seemenu3-2.
Manual defrosting cannot be initiated on the slave case controller.
The No Defrost alarm applies to master and slave. Demand defrosting on the master can lead to this fault
reportbeinggeneratederroneouslyontheslave,forexamplewhenmonitoringtimeissettoolow.Any
draintimesetwillnotcommenceuntildefostinghasbeenfullycompletedandcoolingresumes.
Once defrosting is started by the internal clock, no new defrost cycle can be initiated until the safe defrost
timehasexpiredeventhoughthecontrollermayhavereturnedtocoolingmodebeforethen.
The set controller mode and activation of master-slave mode can be checked in the Type and Version
menu 6-2-1.
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ATTENTION
Damage to equipment and goods!!
Faulty setting of coding switches and defrost timer (INT/EXT) can result in evaporator icing due to
non-synchronized defrosting or failure of defrosting to take place!
Demand defrosting works only on the master case controller. The initiation of a manual defrost on
the slave is also prohibited.
Due to a defrost on demand configured in a slave it is possible that the master defrosts while the
slave continues to operate in cooling mode.
The safe defrost time for the slave must be exactly the same as the safe defrost time for the master
in order to prevent one of the two case controllers switching to cooling mode before the other as a
result of the elapse of a safe defrost time
Counting rate for demand defrosting must be set to zero (0) on the slave controller. Die Waiting
time for commencement of defrosting must not be set to any other value but 0 on the slave, as
otherwise defrosting on master and slave will not be synchronized.
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