REXROTH IndraDrive Fc FCS01, Operating Instructions Manual

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Rexroth IndraDrive FCS01.1 Installation
8-15
DOK-INDRV*--FCS01*****-IB01_EN-P
X5, DC Coupling (+B, -DC)
DC coupling with FCS01 makes sense when drives in one system
simultaneously work in a motor-driven and a regenerative manner. In this
process, the energy from the regenerative drive is supplied back to the
motor-driven drive. This is of advantage in view of energy consumption
and utilization of braking resistors.
Note the following points:
•
Keep the connecting line bB and -DC as short as possible.
•
Make sure that the coupling is not provided before readiness for
operation is signaled. Otherwise, there is the risk that the DC bus
capacitors of all frequency converters are charged by only one
frequency converter.
•
Make sure that the coupling is severed if one of the devices is no
longer operative.
•
With DC Coupling use a braking resistor (possibly of low capacity).
•
It is possible to use frequency converters without a mains choke only if
devices of identical capacity (identical type) are coupled and identical
system impedances are active (identical cable length to mains bar).
Otherwise, provide a mains choke in the power input line of each
frequency converter.
M
3~
PE U V W +B -B -DC
PE L3 L2 L1
L1 / L
L2 / N
L3 / -
PE
M
3~
PE U V W +B -B -DC
PE L3 L2 L1
Coupling when
FCSs ready
Signal of
operativeness
from all FCSs
Fig. 8-17: DC coupling