Speed Control - Siemens LMS14 User Manual

Starting speed
coll pump 1
Starting speed exch pump
Starting speed buffer
pump
Starting speed swi pool
pump
Pump speed min/max
Speed Xp/Tn
Pump speed min/max
OEM
292/617
Building Technologies Division

6.15.11 Speed control

Line no. Operating line
3865 Starting speed coll pump 1
Starting speed of the collector pump.
Line no. Operating line
3867 Starting speed exch pump
Starting speed of the solar heat exchanger pump.
Line no. Operating line
3868 Starting speed buffer pump
Starting speed of the solar buffer storage tank charging pump.
Line no. Operating line
3869 Starting speed swi pool pump
Starting speed of the solar swimming pool charging pump.
Line no. Operating line
3870 Pump speed min
3871 Pump speed max
The speed of the solar pump motor is limited (minimum and maximum permissible
speed).
Line no. Operating line
3872 Speed Xp
3873 Speed Tn
The charging setpoint for the storage tank with the first charging priority and the
collector temperature are used for speed control. The PI controller calculates the speed
such that the collector temperature lies 2 K below the switch-on temperature. If, due to
strong solar radiation, the collector temperature rises, the speed is increased. If the
collector temperature drops below this setpoint, the speed is decreased. A parameter is
available to select minimum and maximum limitation of pump speed. The PI controller
can be adjusted via parameters Proportional band (Xp) and Integral action time (Tn). It
has a neutral zone of ±1 K.
The resulting speed is delivered via P1 function output (PWM output) as configured.
With charging priority changeover, the speed is controlled by the controller according to
the new charging setpoint.
Line no. Operating line
3875 Pump speed min OEM
3876 Pump speed max OEM
These are the limits of the speed range for control of the solar pump at the OEM level.
These limits confine the setting range at the Heating engineer level.
User Manual LMS14...
6 The settings in detail
CC1U7471en
28.01.2015