ECKELMANN Case Controller UA 4 E Series - Standalone Operation Using Activated Local Pressure Transmitter

Firmware V3.13
21.04.2021
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5.4.2 Standalone operation using activated local pressure transmitter
Only UA 410 E AC
If this operating mode is used, the suction gas temperature t
0
for determination of the superheat is calculated
using the suction gas temperature t
0
coming from the local pressure transmitter and the value of the evaporator
outlet sensor R6.x; see chapter Superheat control. This operating mode is recommended for evaporators with
high refrigerating capacity that require high control dynamics:
The determination of the superheat via the local pressure transmitter is activated by setting the parameter AIn1
aktiv to "ON" (menu 6-2-6). The suction gas temperature t
0
determinedusingthelocalpressuretransmittersis
always the preferred one; even if the suction gas temperature t
0
transmitted by the pack controller via the CAN
bus is available in the controller, as the controller is integrated in the CAN bus.
ATTENTION
In the event of failure of the pressure transmitters and the CAN bus (suction gas temperature t
0
for
superheat control is no longer available), the controller can operate to a limited extentintheso-called
standalone mode. This means that the case controller operates autonomously. In this case, R5.x and
R6.x are necessary sensors and must be connected; see chapter Standalone operation using
evaporator inlet sensors.
Further parameters for the configuration of local pressure transmitters must be observed; for further
details, see chapter On-off control.
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