Scaling - Siemens SINAMICS G120 Operating Instructions Manual

Advanced commissioning
6.14 Free function blocks
6.14.4

Scaling

If you interconnect a physical quantity, e.g. speed or voltage to the input of a free function
block, then the inverter automatically scales the signal to a value of 1. The analog output signals
of the free function blocks are also scaled: 0 ≙ 0 %, 1≙ 100 %.
If you interconnect the output signal of a free function block with a function that requires
physical input quantities, then the inverter converts the scaled signal into the physical quantity.
Scaling parameters of physical quantities
Speed
Voltage
Current
Torque
Power
Angle
Temperature 100 % ≙ p2006 reference temperature
The allocation of parameters and scaling parameters is provided in the parameter description
of the List Manual.
Limits
The inverter expects limits within the free function blocks as scaled values:
Scaled limit = physical limit value / value of the reference parameter
236
100 % ≙ p2000 (reference speed)
Example: p2000 = 3000 rpm, actual speed 2100 rpm ⇒ the scaled input quantity
= 2100 / 3000 = 0.7.
100 % ≙ p2001 reference voltage
100 % ≙ p2002 reference current
100 % ≙ p2003 reference torque
100 % ≙ p2004 reference power
100 % ≙ p2005 reference angle
Example: p2006 = 100 °C, actual temperature = 120 °C. ⇒ the scaled input
quantity = 120 °C / 100 °C = 1.2.
Converter with the CU250S-2 Control Units
Operating Instructions, 04/2018, FW V4.7 SP10, A5E31759476B AG