REXROTH IndraDrive C - Page 273

Rexroth IndraDrive Calculations 15-15
DOK-INDRV*-SYSTEM*****-PR02-EN-P
15.4 Determining the Leakage Capacitance
The leakage capacitance consists of the values of motor cable and motor
of all individual drives operated at the mains filter. It is calculated as
follows:
_ab_KG_ab_MGG _ab_
C CC +=
C_ab_G: total value of leakage capacitance
C_ab_MG: total value of leakage capacitance of motor
C_ab_KG: total value of leakage capacitance of cable
Fig. 15-38: Total leakage capacitance
The total capacitance C_ab_MG consists of the sum of capacitances of
the individual motors. For these individual capacitances see Project
Planning Manual for motor (a list of selected values is contained in the
appendix of this drive system documentation).
)_(C...)2_(C)1_(CC
_ab_ab _ab_ab_MG
nMotorMotorMotor +++=
C_ab: leakage capacitance of a motor
Fig. 15-39: Total leakage capacitance of motor
KnBelag_KnK2Belag_K2K1Belag_K1_ab_KG
l * C...l * Cl * CC +++=
C
Belag_K1
: capacitance of cables
C
_ab_KG
: total leakage capacitance of cables
Fig. 15-40: Total leakage capacitance of cables
The total capacitance C_ab_KG consists of the sum of capacitances of
the individual motor cables. For the individual capacitances see the
technical data of motor cables (a list of selected values is contained in the
appendix of this drive system documentation).