ECKELMANN UA 400, Руководство по эксплуатации

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Firmware V3.15 21.04.2021 25/401
5.3 Controller function
The sections following describe the various functions of the Case/Cold-room Controller. Availability of certain
controller functions depends on the controller type set on DIP switch S3 (see Section
Setting of the controller
type and master/slave mode ).
5.4 Cooling
5.4.1 Temperature control by supply and return air in single-zone operation
Controller type: UA 111, UA 111 D, UA 121, UA 131, UA 131 DD, UA 141
Double on-off control by supply and return air (type UA 111, UA 121, UA 131, UA 131 DD, UA 141)
Control is made alternatively by two temperature sensors (supply air or return air temperature in pilot case).
The cooling relay de-energizes when temperature reaches the setpoint (switch-off value) on one of the two
sensors connected. The cooling relay re-energizes with the set hysteresis of the sensor causing switch-off.
Two-stage (twin) control by majority (type UA 111 D only)
Type UA 111 D is a special controller for multideck cases not equipped with a defrost heater and operating on a
twin condensing unit.
With its five supply air and five return air sensors, the controller is capable of controlling maximum five case
length modules. Compressors are controlled as a function of the majority of all connected temperature sensors
of a case line-up. This means that the peak-load compressor will be stopped when temperature reaches the
setpoint (switch-off value) on the majority of the connected supply air or return air sensors (e.g. 3 out of 5).
The base-load compressor is stopped when temperature reaches the setpoint (switch-off value) on the last
remaining supply air or return air sensor. The base-load compressor is restarted when temperature exceeds the
switching differential on the majority of the connected supply air or return air sensors. The peak-load
compressor is restarted when temperature exceeds the switching differential on all supply and return air
sensors. Base load rotation is integrated to avoid varying operating times of the base-load and peak-load
compressors.
Base load rotation takes place every time a compressor is started or stopped, not later than every 2 hours. By
contrast with the base-load compressor, which starts immediately the start temperature is obtained, the peak-
load compressor only starts after a definable start delay has expired (parameter Delay 2nd Comp (Menu 6-3).
Single-zone operation
Control is made by two temperature sensors (supply air or return air sensor of the pilot case). Cooling can take
place in single-zone or two-zone operation.
R2.1: Supply air sensor
R4.1: Return air sensor
If only one of the two sensors (supply or return air) is fitted, control is made exclusively by the one
sensor.
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