Mannesmann Rexroth DKR02 - Autotransformers

DKR Drive Controllers Planning the electrical connections 6-11
DOK-DIAX03-DKR********-PR02-EN-P
Autotransformers
CAUTION
Damage to the autotransformer if it is not sized
large enough!
⇒
Please note the following guidelines.
⇒
Dimension the power S
Netz
of a possibly required autotransformer in
terms of the rated motor power or at least, however, in terms of the
actual continuous motor power:
DauerMotorNetzDKR
PI *8,1=
NetzDKRNetzDKRNetz
IUS **3=
I
NetzDKR
: mains current [A]
P
DauerMotor
: actual continuous power of the motor [kW]
S
Netz
: power of the autotransformer [kVA]
U
NetzDKR
: mains voltage [V]
Fig. 6-11: Formula to determine the power of the autotransformer
⇒
Make sure that the inductive components of the relative short-circuit
voltage u
KX
are less than 4 %:
%100*
1
1
Nenn
KX
KX
U
u
u =
u
KX1
: primary short-circuit voltage (inductive components) [V]
U
Nenn1
: rated voltage of the transformer, input side [V]
Fig. 6-12: Formula to determine the inductive components of the primary mains
voltage
LSA Control S.L. www.lsa-control.com comercial@lsa-control.com (+34) 960 62 43 01