ECKELMANN Case Controller UA 4 E Series - Page 52

Firmware V3.13
21.04.2021
52/466
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Superheat regulation
In order to determine the superheat there are a number of channels which the controller can use to calculate
thetemperaturecorrespondingtothesuctionpressure.Thefollowingprioritiesapply:
t
0
localZ1:
Thelocalpressuretransmitterisusedfortheregulationinzone1andzone2,see menu 6-2-6! One MUST
beinstand-aloneoperation.Whenusingthefunction“toZ2ctl”(seeparameter“Fct.AIN2”inmenu
6-2-6)the value t0 local Z1 is used for the regulation of zone 1 and the value t
0
localZ2for zone 2.
t
0
overCANbus:
A t
0
valuereceivedfromaremotecasecontrollerviatheCANbus,see menu 6-2-6.
t
0
VSkorr:
Transmitted from the pack controller via the CAN bus, see menu 6-1 and 6-3.
R5.x:
Generally,inordertoguaranteehighplantsafetyinbothCANbusandstandaloneoperation, the
evaporator inlet sensor R5.x must always be connected.
The value from the pressure transmitter connected to analogue input 1 (AIN1, terminals 21/22) is preferred
forevaluation(seechapterOn-off control).Ifthisisdeactivatedorfails,thenrecourseismadetothet
0
transmittedfromacasecontrollerorthepackcontrollerviatheCANbus.Ifthisisalsonotavailable,thenthe
evaporatorinputsensorR5.xisemployed.
Limiting of the evaporator output sensor R6.x
Only UA 410 E AC,
Only controller type UK 100 E,
OnlywhenthefunctionoftheanalogueinputAIN2issetto“tcLT”,seemenu6-2-6.Incascadecontroller
operation it is possible that the measuring range at the evaporator output sensor R6.x is exceeded. In order to
ensure regulation in this limit range the sensor value is kept at the upper end of the measuring range for as
long as it is exceeded. With the sensor type L243 for example, this value is 50°C.
When employing the function “toZ2ctr”, see parameter “Fct. AIN2” (menu 6-2-6), in the event of a
failure of the pressure transmitter no recourse (fallback) is made to the suction pressure value
transmitted from the pack controller via CAN bus!
