218/617
Building Technologies Division User Manual LMS14... CC1U7471en
6 The settings in detail 07.05.2014
The PWM limits for the pumps on the Heating engineer level are either relative or
absolute.
The selection is made via factory settings at headquarters level.
With absolute PWM limits, the setting range for the heating engineer is restricted by the
OEM limits. This means that 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.
In the case of relative PWM limits, the speed range restricted by the OEM represents
the basis for the heating engineer’s setting range which, here, always reaches from 0%
to 100%, where 0% corresponds to the OEM’s minimum value and 100% to the OEM’s
maximum value. Values between 0% and 100% restrict accordingly the speed range
defined by the OEM. Here, the pump speed values displayed are not identical with the
control values for the pump.
For every pump, a set of 6 parameters are available for limiting the speed. These are
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. The only active limitation is that between minimum and maximum values
(minimum cannot be set above maximum, and vice versa).
Note!
The setting limits at the OEM level are still confined 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 maximum value at the Heating
engineer level. When using the relative PWM limits, it is therefore recommended to
set both the low and the high speed limit at the Heating engineer level to 50%.
Hence, 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.
Line no. Operating line
2321 Starting speed
Starting speed of boiler pump.
Line no. Operating line
2322 Pump speed min
For the modulating pump, the working range can be defined as a percentage of output.
Internally, the control translates percentage figures to speed.
The minimum value should be selected such that the pump is reliably activated when
controlled.
Line no. Operating line
2323 Pump speed max
Power consumption can be limited via the maximum value.
PWM limits
relative/absolute
Starting speed
Pump speed min
Pump speed max
To Next Page
Loading...
Need help?
General
