ECKELMANN Case Controller UA 4 E Series, Инструкция по эксплуатации

Страница: 456 / 466

Firmware V3.13 21.04.2021 456/466
11.1.3 Low temperature monitoring t0
This function initiates monitoring of the t0 transmitted by the pack controller to check for inappropriately low
values and is used, amongst other things, for the early detection of instances where the case controller has
been assigned to the “wrong” pack controller (for assignment, see menu 6-1).
The case controller continually monitors whether the to value transmitted by the pack controller is too low. The
supply air, return air, cold room or subcooler setpoint is used for this. When this setpoint, minus the parameter
Untertmp. t
0
(menu 6-2-7) for the delay time of one minute is greater than t0, the alarm t
0
überprüfen is
activated. The alarm is deactivated with a hysteresis of 2K. The function can be switched off when the
parameter is set to “--“.
The following assignment is applicable for the setpoint used for monitoring:
Controller type Sensor
UA 121 E, UA 131 E, UA 131 E LS, UA 141 E R2.1 / R2.2
UR 141 NE, UR 141 TE, UK 100 E, KR 160 E R4.1 / R4.2
11.1.4 Alarm in the event of the absence of a defrost
The Alarm „No Defrost“ is generated if defrosting does not take place within an adjustable time. No alarm is
generated if defrosting is suppressed due to high temperature or by demand defrosting.
Master/slave defrost / defrost sequenz via CAN bus
If the defrost is not conducted then the alarm message „No Defrost” is generated by both the master and
slave controller. The generation of this message is coupled to the alarm delay time and thus is automatically
sent by all affected controllers if no defrost takes place.
As long as the alarm to überprüfen is active, the case controller regulates the superheat via the
temperature sensor R5.x/R6.x and not via the t
0
value received from the pack controller. Practical
tip: This value can be set to “—“ after the commissioning.

The alarm
t
0 überprüfen used for this is also used for the alarm signalling in the event of the assigned
pack controller failing to transmit any t via the CAN bus.

So as to avoid false alarm, the time delay for No Defrost alarm should not be set too short (No Defrost
parameter in Menu 6-2-3). When the maximum interval between two set defrost times is 48 hours, for
example (Menu 3-2), the No Defrost alarm time delay must be set at least one hour longer, i.e. to 49
hours.

For defrost sequenz via CAN bus only: 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.
