Technical data and dimension diagrams
30
Operating instructions RHF
ELTROPLAN
-
REVCON
Elektrotechnische Anlagen GmbH
6.2 Worked sample
The following data are known:
System line voltage
U
L
400 V
Motor power nameplate
P
M
90 kW
Efficiency of the motor
η
M
0,96
Efficiency of the frequency converter
η
FC
0,97
Efficiency of the RHF module
η
RHF
0,98
The maximum line current I
RMS
can be calculated by the following equation:
"
$
%
∗ √3 ∗
∗
∗
"(
"
$
90 +,
400 . ∗ √3 ∗ 0,96 ∗ 0,97 ∗ 0,98
"
= 142,35 4
In this case 144 A must be chosen.
Note!
The true nominal current depends on the actual load; therefore it is lower than the
nominal Data most often.