6.
Determine the number of drive axes.
An HMD drive controller, for example, counts as two drive axes.
7.
Determine the total length of the connected power cables.
8.
Determine the sum of the leakage capacitances on the load side of the
mains filter. The sum of the leakage capacitances results from the num‐
ber of operated axes and the length of the connected power cables.
Procedure for determining the leakage capacitance: See
"Determining the Leakage Capacitance" on page 272
9.
Select the appropriate mains connection (supply unit/converter, mains
choke, mains filter) from the corresponding tables in
Connection Supply Units and Converters" on page 106
The capacity of the mains filters regarding the maximum allowed number of
drive controllers and the maximum allowed total power cable length depends
on whether you use an HMV supply unit or supply other drive controllers with
HCS drive controllers. For supply by an HMV supply unit, the allowed number
and allowed total length are higher.
Notes on Installation
When using HNF01, NFD03, HNS02 or HNK01 mains filters at
mains grounded via outer conductor, install an isolating trans‐
former between mains and mains filter.
15.3.3
Determining Mains Transformer DLT
When using HNF01, NFD03, HNS02 or HNK01 mains filters at
mains grounded via outer conductor, install an isolating trans‐
former between mains and mains filter.
How to Proceed for Selecting the
Mains Transformer
The selection of the mains transformer is significantly determined by the con‐
ditions at the connection point and the supply unit used.
Procedure
1.
Determine S
k_min
(minimum short circuit power of the mains for failure-
free operation) of the supply unit used.
See Project Planning Manual "Rexroth IndraDrive Supply Units and
Power Sections", "Data for Mains Voltage Supply"
2.
In the table "Mains Classified According to Mains Short Circuit Power
and Mains Internal Resistance", read the inductance L
k_min
of the mains
phase in row of S
k_min
.
3.
Determine the short circuit power S
k
present at the connection point.
4.
In the table "Mains Classified According to Mains Short Circuit Power
and Mains Internal Resistance", read the inductance of the mains phase
in row of S
k
.
5.
Calculate difference L: L
k_min
- L
k
6.
Calculate apparent power S
Trafo
:
S
Trafo
= (U
2
LN
× u
k
) / (L × 6.28 × f
LN
)
Relative short-circuit voltage u
k
of DLT transformers is approx. 4%.
15.3.4
Mains Contactor and Fusing
To protect the supply mains and the components in the supply feeder (lines,
mains contactor, mains filter, mains choke, converter, supply unit, etc.) for the
case of a short circuit, install fuses in the supply feeder.
DOK-INDRV*-SYSTEM*****-PR06-EN-P
Rexroth IndraDrive Drive Systems with HMV01/02 HMS01/02, HMD01, HCS02/03
Bosch Rexroth AG
265/309
Calculations
