The leakage capacitance consists of the values of power cable and motor of
all individual drives operated at the mains filter.
Calculation:
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.15-41:
Total Leakage Capacitance
The total capacitance C
_ab_Mg
results from the sum of capacitances of the in‐
dividual motors. For these individual capacitances, see documentation of the
motor. For a list of selected values, see Appendix of this documentation un‐
der
chapter 18.2 "Leakage Capacitances" on page 287
.
C
ab(motor)
Leakage capacitance of a motor
Fig.15-42:
Total Leakage Capacitance of Motor
C
Y_K typ
Capacitance per unit length of cables
C
ab_Kg
Total leakage capacitance of cables
Fig.15-43:
Total leakage capacitance of cables
The total capacitance C
_ab_Kg
consists of the sum of capacitances of the indi‐
vidual power cables. For the individual capacitances per unit length, see the
technical data of the power cables. For a list of selected values, see Appen‐
dix of this documentation under
chapter 18.2 "Leakage Capacitances" on
.
15.3.7
Determining the Allowed Operating Data of Mains Filters
Reducing Allowed Operating Voltage Depending on Actual Temperature Rise Due to Har‐
monics
The mains filters may only be operated in the allowed mains voltage range.
Harmonics (f
n
) at the system voltage cause additional temperature rise of the
dielectric of the capacitors used in the filter. Calculating the temperature rise:
U
Mn
Measured voltage value at frequency fn (harmonic)
U
Gn
Voltage limit value for frequency fn
ΔT
n
Calculated temperature rise of the dielectric for frequency fn
Fig.15-44:
Calculating the Temperature Rise of the Dielectric
The temperature rises have to be added up for all frequencies f
n
≥ f
k
(f
k
: fre‐
quency at which the voltage derating of the filter starts):
DOK-INDRV*-SYSTEM*****-PR06-EN-P
Rexroth IndraDrive Drive Systems with HMV01/02 HMS01/02, HMD01, HCS02/03
Bosch Rexroth AG
273/309
Calculations
