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RMS compact
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Appendix A: Using the Temperature Hysteresis
Function
How it Works
The Hysteresis functionality on both Temperature 1 and Temperature 2 inputs, is an additional temperature
threshold, which enables the RMS compactto switch on a cooling fan or heater unit within a rack, once the
temperature reaches the Upper Warning Limit (UWL) threshold or Lower Warning Limit (LWL) threshould.
In the case of Temperature Upper Hysteresis ,the cooling fan will remain on until the temperature drops 4
degrees centigrade below the UWL.
For Temperature Lower Hysteresis , the heater unit will remain on until the tenmperature rises 4 degrees above
the LWL.
This is done to try and prevent ‘bounce’ of the relay output, and the temperature hovers around the UWL or
LWL threshold, i.e. so that the relay does not continually switch on and off.
This is illustrated in the graph below:
Figure 62: Temperature Hysteresis function
The inverse of the above is true for Temerature Lower Hysteresis.
Setup
The best way to configure the Temperature Hysteresis function is to use the RMS compactViewer/Programmer
software provided. Below is a description of the steps required:
Enable Temperature monitoring & set thresholds
The first step is to make sure that temperature monitoring is enabled, and to set your temperature threshold to
the desired levels.
Start up the RMS compactViewer/Programmer software, and go to the Configure RMS compact section, and
click on the Analogue Inputs box- you should see the following window:
UWL Threshold
UWL minus 4 degrees
Fan switch ON Fan switch OFF
Temperature