Long Cable Applications; Cable Inductance Compensation; Cable Inductance Compensation Parameters - Siemens SINAMICS PERFECT HARMONY GH180 Function Manual

8.24

Long Cable Applications

8.24.1

Cable Inductance Compensation

Long cable applications present a challenge as the cables become a significant contribution to
the overall load impedance.
Compensation for cable inductance affects the output voltage during transient conditions of
current based on the output fundamental frequency.
Previously, compensation had been performed for cable resistance only. Drive base impedance
is calculated as:
Zbase =
where:
Zbase =
Vrated =
Irated =
The cable impedance must be compensated to ensure that the motor is getting the proper
terminal voltage.
Figure 8-35 Motor Terminal vs. Cemf
8.24.2

Cable Inductance Compensation Parameters

Parameters for Cable Inductance Compensation
Refer to the Output Connection Menu (2900) in Section Options for Drive Menu (2) of
Chapter Parameter Assignment / Addressing for the parameter associated with this function:
• Cable inductance (2941)
NXGPro+ Control Manual
Operating Manual, A5E50491925A
[Vrated/√3] * [1/Irated]
Drive base impedance
Drive rated output voltage
Drive rated output current
Lf Lc
R
Advanced Operating Functions
8.24 Long Cable Applications
Ls
Cemf
333