ECKELMANN Case Controller UA 4 E Series, Operating Instruction

Page: 30 / 466

Firmware V3.13 21.04.2021 30/466
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5.4 Standalone operation
Only UA 400 E / UA 410 E
In this operating mode, the controller operates standalone, operation is local, see chapter Local operation with
a BT 300 x Operator Interface . In addition, this Alarm relay is required for alarm signalling, otherwise no alarm
path is available. In contrast to this CAN bus mode , the suction gas temperature t
0
for determining superheat is
determined on the case controller itself. The case controller has two standalone operating modes for
determination of the superheat.
Standalone operation using evaporator inlet sensors
Standalone operation using activated local pressure transmitter
Standalone operation affects the following functions of the case controller:
Necessary sensors (see chapter Necessary and optional sensors )
Pump down of the evaporator after the defrost (for the following temperature control)
Superheat control (see chapter
Superheat control )
Alarm is signalled via the alarm relay Alarm relay
Local operation with a BT 300 x operator interface:
5.4.1 Standalone operation using evaporator inlet sensors
Only UA 400 E / UA 410 E
The UA 400 E CC and. UA 410 E AC can operate to a limited extent in so-called standalone operation. This
means that the case controller operates autonomously without CAN bus connection. In standalone operation,
superheat is determined using evaporator inlet sensor R5.x and evaporator outlet sensor R6.x.
For this operating mode, the parameter Korroff. t
0
must be set to "--" (menu 6-3).
On the other hand, CAN bus mode the suction gas temperature t
0
of the associated pack controller for the
refrigeration circuit is used to determine superheat via the CAN bus (integrated in the CAN bus).
ATTENTION
This operating mode is not suitable for normal operation , but only for the Emergency Op. , the
commissioning or for service purposes!
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