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• Menu sequence and structure
3110086 EHC20 UK 110515
6. Special functions
In the ”6. Special functions” menu, basic settings and advanced functions
can be configured.
With the exception of the time, the settings should only
be configured by specialists.
You can exit the menu by pressing ”esc” or selecting ”Exit special functions”.
The menu numbering varies depending on the hydraulic schema chosen (see ”6.1 Program selection”)
6.1 Program selection
You can select and set the appropriate hydraulic variant for your particular application here (see Hydraulic variants /
schemata / systems 24).
Setting range: 1-48 / default: 1
Under normal circumstances, the program is selected once only when the specialist is setting up the controller.
If an incorrect program is selected, this may lead to unexpected malfunctions.
6.2 Rotational speed control
If rotational speed control is enabled, a special internal electronic system in the EHC allows you to alter the rotational
speed of pumps according to process requirements.
This function should only be enabled by a specialist. Depending on the pump and pump level used, the
minimum rotational speed should not be set too low because the pump or the system could otherwise be
damaged. The information provided by the relevant manufacturers must also be observed! In case of doubt, it
is better to set the min. rotational speed and pump level too high rather than too low.
6.2.1 Rotational speed modes
The following rotational speed modes are available:
Off
: There is no rotational speed control. The pump connected is switched on at full speed or switched off.
Mode 1
: The controller switches to the set max. rotational speed after the purging period. If the temperature difference
∆T between the reference sensors (collector and storage tank) is below the set switch-on temperature difference ∆T R1,
the rotational speed will be reduced.
If the temperature difference between the reference sensors is above the set switch-on temperature difference ∆T R1,
the rotational speed will be increased. If the controller has adjusted the rotational speed of the pump down to the
lowest level and the ∆T between the reference sensors is ∆Toff, the pump is switched off.
Mode 2
: The controller switches to the set min. rotational speed after the purging period. If the temperature difference
∆T between the reference sensors (collector and storage tank) is above the set switch-on temperature difference ∆T R1,
the rotational speed will be increased.
If the temperature difference ∆T between the reference sensors is below the set switch-on temperature difference ∆T
R1, the rotational speed will be reduced.
If the controller has adjusted the rotational speed of the pump down to the lowest level and the ∆T between the
reference sensors is ∆Toff, the pump is switched off.
