Siemens SINAMICS G120 Operating Instructions Manual page 266

Setting functions
8.7 Application-specific functions
Adapting the operating characteristic
Precondition
You require the following data to calculate the system-specific operating characteristic:
● Operating characteristics of the manufacturer
– for pumps: Delivery height and power as a function of the flow rate
– for fans: Total pressure increase and power as a function of the flow rate
● System characteristics for 5 different flow rates.
Procedure
Proceed as follows to adapt the operating characteristic:
1. For the 5 different flow rates, calculate the delivery height requirement, referred to a
pump, which is directly connected to the line supply (n = 100 %).
To do this, set the formula for the system characteristic the same as the formula for the
operating characteristic of the delivery height.
For a correspondingly lower delivery height, you only require a correspondingly low
speed.
2. Enter the speeds into parameters p3321, p3323, p3325, p3327 and p3329.
3. Based on the flow rates and the associated operating characteristic of the manufacturer,
calculate the power that the pump requires for the various flow rates when connected
directly to the line supply.
4. Enter the values into parameters p3320, p3322, p3324, p3326 and p3328.
You have adapted the operating characteristic, and you now obtain a precise result for the
energy saving.
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Converter with the CU250S-2 Control Unit (vector)
Operating Instructions, 06/2013, FW V4.6, A5E31759476B AB