Night Setback Of Thermostat Value; Temperature Sensor Types - Danfoss AK-CC55 Compact User Manual

AK-CC55 Compact

Night setback of thermostat value

In refrigeration appliances there may be big load differences between the shop's opening and closing hours,
especially if night lids/blinds are used. The thermostat reference may be raised here without it having any effect on
the product temperature.
Change-over between day and night operation can take place as follows:
• via an external switch connected to a digital input
• via a signal from the data communication system
Figure 12: Thermostat band function with Night setback

Temperature sensor types

The S2 and S6 sensors always have to be Pt1000 sensors due to the high measuring accuracy.
For the S3, S4 and S5 sensors, the user can select between the following sensor types:
0 = Pt1000 (Danfoss AKS 11)
1 = PTC1000 (Danfoss EKS 111)
2 = NTC 5k (Danfoss EKS 211)
3 = NTC 10k (Danfoss EKS 221)
4 = User-defined
If "User-defined" is selected, three sensor measuring points must be provided and based on these three sensor
points, a sensor characteristic is generated.
A sensor point is defined by setting a temperature value and the corresponding resistance value at this temperature.
The resistance value is set via two values for kohm and ohm respectively. These values can be found in the data
sheet for the sensor.
The three sensor points must be:
1. Lowest temperature in wanted measuring range
2. Highest temperature value in wanted temperature range
3. Temp. value in the middle where a high measuring accuracy is required
A sensor error is detected at temperature values below/above the min./max. temperature values typed in for the
sensor points.
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