ECKELMANN Case Controller UA 4 E Series, Инструкция по эксплуатации

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Firmware V3.13 21.04.2021 76/466
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Necessary measures for the parametrisation of the master/slave defrost via CAN bus
The safe defrost time of the master is also applicable for the slave controllers. Possibly deviating values set
at the slave controllers are not taken into account:
The wait and drip times of the master are also applicable for the slave controllers. Possibly deviating values
set at the slave controllers are not taken into account:
The initiation of a defrost (manual, external, internal, CAN) on a slave node is not permitted and will be
prevented.
Exception: Slaves with the M/S CAN address = “—“ can have external defrost sources (see Special
Application Case).
The defrost on demand only functions on the master. Any possibly parametrised defrost on demand for the
slave controllers will be ignored.
The defrost termination temperature must be set individually for each slave controller.
Status values
The total number of controllers participating in the master/slave process is displayed in menu 1-3 (parameter
"
M/S Anz. Sl. "). The number is recalculated with each reset and setting of the parameter " M/S Abt Fkt " to
" Master ".
In addition, menu 1-3 also displays the last UA that did not give any feedback to the master during defrost
(parameter "
M/S verl. Sl. "). If the defrost proceeded without error, this value is "--".
If a defrost is requested at the master (defrost timer, manual or external) and the master itself has already
reached the defrost termination temperature, it does not defrost and defrosting of the slaves is not initiated at
all.
Behaviour of a Master/Slave CAN slave when it receives a defrost command from a master and the defrost
conditions have not been met (slave is too warm): the slave does not defrost and does not cool while the
cooling remains blocked by the master.
Alarm signalling when defrost is not performed
A " No Defrost " message is output by both the master as well as the slave controller if the defrost was not
performed. The generation of this message is coupled 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. This message is generated if a
slave fails to receive a signal from its defrost master for a period longer than 60 minutes.
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.