ECKELMANN Case Controller UA 4 E Series - Limiting the Opening Degree; MOP Function

Firmware V3.13
21.04.2021
61/466
5.7.14 Limiting the Opening Degree
An upper limit to the opening degree output by the case controller can be set using this function. This opening
degree is never greater than the maximum value set using the parameter Maximum OD (menu 6-2-7).
5.7.15 MOP function
The MOP point (Maximum Operating Pressure) is part of the superheat regulation and describes the
maximumpermissiblevalueoftheevaporationtemperaturet0.Ift0belowerthanthesetMOPpointthen
normalsuperheatregulationiscarriedout.Ift0exceedstheMOPpointthentheopeningdegreeoftheEvalue
isreduceduntilitfinallyclosescompletely.
Thisbehaviourisachievedby”freezing”thetemperaturesensorR6,whichsimulatesasmallsuperheatto
thecontroller.ThusitisirrelevanthowhighthetemperatureatR6risesasthesuperheatcontrolleronlysees
themaximumvalueR6'whichitcalculatesfromthesetMOP+thesuperheatsetpoint(Setp.SH).With
increasingtoand”frozen”R6,thesuperheatSH'(SH=R6-t0)sinksandtheopeningdegreeofthevalveis
reduced.
Atthelatest,oncetheminimumsuperheathasbeenreached(ifactive)thevalveclosescompletely.MOPmode
functionsbothinCANbusoperationandstand-aloneoperation(tomeasureviaR5orthelocalpressure
transmitter).
ATTENTION
Damage to goods! If the value is too low the case controller may no longer be able to reach the
preset temperature setpoint. This value should not be set too low.
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