Converter Efficiency At Partial Load; Partial Load Efficiency Of S120 Basic Line Modules - Siemens SINAMICS G130 Engineering Manual

Fundamental Principles and System Description
Engineering Information
The power losses P
L-100
Catalogs D 11 or D 21.3 or in the operating instructions (equipment manuals).
The efficiency of the converter η
and the power losses P
L-100
h
100
This formula can be applied to individually calculate the full load efficiency of the SINAMICS converters as a function
of the line voltage and the power factor of the connected motor.
If the efficiency calculation for SINAMICS converters is performed on the basis of a typical power factor of
cosφ = 0.88 (4-pole asynchronous motors in the power range from 100 kW to 1000 kW), the following typical
Mot
converter efficiency factors at full load are obtained:
·
SINAMICS G130 and G150 with pulse frequency according to factory settings:
·
SINAMICS S150 with pulse frequency according to factory settings:
1.14.2

Converter efficiency at partial load

1.14.2.1 – – –

1.14.2.2 Partial load efficiency of S120 Basic Line Modules

The chart below shows the partial-load efficiency of air-cooled and liquid-cooled SINAMICS S120 Basic Line
Modules. The calculations are based on a typical efficiency at full load of 99 %. The efficiency is represented as a
function of the active output power ratio P
Modules.
Efficiency of air-cooled and liquid-cooled S120 Basic Line Modules
as a function of the active output power ratio P
SINAMICS Engineering Manual – November 2015
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Ó Siemens AG
of the converters at full load are device-specific values and can be found either in the
at full load is calculated on the basis of the active electrical output over P
100
according to the formula
P
-
= »
Out 100
(
+
P P
3
- -
Out 100 L 100
/P
Out Out-100
/P
Out
× × ×
3 V I cos
-
Line Out rated
j
× × ×
V I cos
-
Line Out rated Mot
supplied by the BLM to the connected SINAMICS S120 Motor
in %
Out-100
j
Mot
)
.
+
P
-
L 100
η = 97.7 % - 98.3 %.
100
η = 96.0 % - 96.5 %.
100
Out-100
(3)