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Relative and absolute
PWM limits
Solar controlling
element
External solar
exchanger
Building Technologies Division
The PWM limits for pumps at the Heating engineer level are either relative or absolute.
The selection is made via factory settings at the Heating engineer level. With absolute
PWM limits, the setting range for the heating engineer is restricted by the OEM limits.
The heating engineer can vary the minimum speed only above the minimum set by the
OEM, and the maximum speed only below the maximum set by the OEM. With relative
PWM limits, the speed range restricted by the OEM forms the basis for the setting
range available to the heating engineer, which always reaches from 0% to 100%. This
means that 0% corresponds to the OEM's minimum value, and 100% to the OEM's
maximum value. Values between 0% and 100% naturally restrict the speed range
limited by the OEM. Here, the values displayed for the pump speed are not identical
with the control value for the pump. For speed limitation, a set of 6 parameters are
available for every pump. It consists of the absolute min./max. values at the Heating
engineer level, the relative min./max. values at the Heating engineer level, and the
min./max. values at the OEM level. The parameters for the relative speed limits are not
interlocked with the limits at the OEM level. There is only a reciprocal limitation of min.
and max. value active (min. cannot be set above max., and vice versa).
Note!
The setting limits at the OEM level are also restricted by the parameters for the
absolute speed limits at the Heating engineer level. This means that the upper speed
limit at the OEM level cannot be set below the max. value at the Heating engineer
level. When using the relative PWM limits, it is therefore recommended to set the
lower and upper speed limit at the Heating engineer level to 50%. This means that
the range from 0% to 50% is available for the lower OEM limit, and the range from
50% to 100% for the upper OEM limit.
6.23.7
Solar
Line no.
Operating line
5840
Solar controlling element
Charging pump
Diverting valve
In place of a collector pump and diverting valves for integrating the storage tanks, the
solar plant can also be operated with charging pumps.
Charging pump
When using a charging pump, all heat exchangers can be used simultaneously. Parallel
or alternative operation is possible.
Diverting valve
When using a diverting valve, it is only one heat exchanger that can be used at a time.
Only alternative operation is possible.
Line no.
Operating line
5841
External solar exchanger
Jointly
DHW storage tank
Buffer storage tank
In the case of solar plant diagrams with 2 storage tanks, it must be selected whether
there is an external heat exchanger for both the DHW and the buffer storage tank or for
only one of them.
User Manual LMS14...
6 The settings in detail
395/617
CC1U7471en
28.01.2015
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