Siemens AVS75.39 Series User Manual page 68

Speed control
Pump speed reduction
Pump speed min /max
Characteristic curve
correction at 50% speed.
Flow setpoint correction,
speed control
68 / 239
Siemens
Building Technologies
Speed-controlled pumps can be connected to outputs Ux.
Line no.
HC1 HC2 HC3
880 1180 1480
882 1182 1482
883 1183 1483
888 1188 1488
890 1190 1490
Operating level
The heating circuit pump speed is calculated by present operating level.
At the Comfort level or during the time the floor curing function is performed, the
pump is controlled at the parameterized maximum speed.
At the Reduced level, the pump is controlled at the parameterized minimum speed.
Characteristic
For the compensation variant weather compensation (with or without influence),
the heating circuit pump speed is maintained at the minimum parameterized speed
as long as heat demand can be covered. The heating curve is increased in order to
cover heat demand at a reduced speed.
The increase in flow temperature can be parameterized. The setting defines the
flow increase in percentages at minimum speed for the heating circuit pump.
The speed is increased only after the maximum permitted flow setpoint is reached.
Using these settings, minimum and maximum limitation of the pump speed is
provided.
Percentage for flow setpoint boost at 50% speed.
Yes
The heat request from the heating curve is increased by the parameterized
percentage.
Heat request = Room setpoint + (flow setpoint – room setpoint) * 1.2
No
The request to generation is not increased. The speed is reduced until heat
transfer is correct as per the characteristic curve calculation if the present flow
temperature is warmer than the heating curve at 100% speed.
User manual RVS43.345
The settings in detail
Operating line
Pump speed reduction
Operating level ¦ Characteristic
Pump speed min
Pump speed max
Curve readj at 50% speed
Flow setp readj speed ctrl
No ¦ Yes
CE1U2354en_021
2013-09-02