ECKELMANN Case Controller UA 4 E Series - Alarm in the Event of the Minimum Permitted Superheat Being Undershot; Sensor Break Alarm; Suppression of Sensor Break Alarm During Defrosting

Firmware V3.13
21.04.2021
457/466
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11.1.5 Alarm in the event of the minimum permitted superheat being undershot
Analarmsignalissentwhenthelimitvalue”MinimumSuperheat”isundershotfollowingtheendofthe
10minutedelaytimeandtheopeningdegreewasgreaterthan0%.
11.1.6 Sensor break alarm
Alarm is generated after the set time delay if the controller detects sensor break or short circuit (menu 6-2-3).
The sensor failure message also applies to the pressure transmitter configured via parameters AIN1 activ
i.e.AIN2activ(menu6-2-6)andistriggeredafterasettimedelayofoneminute.Forsensorfailuresonthe
temperaturesensorsthesettimedelaycontinuestoapply(menu6-2-3).
11.1.7 Suppression of sensor break alarm during defrosting
While defrosting is in progress, temperature sensors and particularly the evaporator sensors may
becomeheatedtoatemperatureabovethelimitsofthecase/coldroomcontroller'stemperaturedetection
range.Sensorbreakalarmisaccordinglysuppressedforthedurationofdefrostingsoastoavoidsignallingof
false alarms.
Thefollowingconditionsapply:
Sensor break alarm effective prior to defrosting is NOT suppressed.
Sensor break alarm takes place with the set delay during any drain time that may be defined.
Sensor break occurring during defrosting and persisting beyond termination of defrosting is alarmed when
the set delay expires.
Sensor break alarm suppression is effective with all types of defrost (internal, external, discharge gas,
manual
and master/slave defrosting).
With internal and manual defrosting, sensor break alarm is suppressed for the complete safe defrost time
regardless of defrosting terminating before that.
Sensor break alarm is always generated in the case of sensors required for control functions. Sensor
break is only alarmed on optional sensors when these sensors are not removed from monitoring by
sensor scan (Menu 6-1).
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In the most unfavorable instance, sensor break alarm is merely postponed. The longest possible delay
would be ( 2 * T
Sensor break delay
) + T
Defrost
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If the delay time for the sensor failure alarm is set to zero minutes there is no alarm suppression and
the alarm is generated immediately following detection of the sensor failure.
This setting is not recommended for the continuous operation of the controller!
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