REXROTH RD 500 RD42, Руководство по эксплуатации

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RD 500 RD42 Description
1-1
DOK-RD500*-RD42*******-IB03-EN-P
1 Description
1.1 General information
The RD42 supply modules, which are capable of regenerative feedback,
are designed to be connected to inverters with DC connection from the
REFUdrive 500 series. They are suitable for regenerating into the line
supply, for example, when drives are braked.
The three-phase supply is fed-in via a line filter and an uncontrolled three-
phase bridge rectifier. The DC link capacitors are pre-charged via series
resistors and an auxiliary contactor. If faults develop in the power section,
or e.g. if the drive converter is powered-up with a ground fault at the DC
link output, pre-charging is automatically and safely interrupted. When the
system runs-up correctly, the charged capacitors are connected to the
line supply through a diode rectifier using a power contactor, and then the
inverter is enabled.
The supply modules have two operating modes:
Operating mode, standby:
(terminals X52.5 and .6 open-circuit)
The regenerative feedback into the line supply is active. The quiescent
current (if there is no regenerative feedback) is almost zero. The
regenerative power is limited to 50 % of the specified values; refer to the
technical data.
Operating mode, run:
(Terminals X52.5 and .6 closed or there is a significant level of
regenerative feedback)
The regenerative feedback into the line supply is active. The quiescent
current (if there is no regenerative feedback) is approx. 30 % of the rated
current. The regenerative feedback power corresponds to the specified
values, refer to the technical data. The changeover into the run operating
mode can be externally initiated (X52), or is automatically set as a
function of the regenerative feedback power.
1.2 Dimensioning information
Dimensioning the power sections
Two criteria are taken into account when dimensioning the power
sections:
Power consumption
This is the sum of the power drawn from the DC link, taking into account
losses and a coincidence factor. The power which may be drawn from the
DC link is specified under 1.3 Technical data.
Total number of units which can be connected
Capacitors are used in the inverters which are used to smooth the DC link
voltage. When the drive converter is powered-up, these must be charged
using a pre-charging device. If too many inverter modules are connected
to the DC link, then there is a danger that the pre-charging device will be
overloaded.
Every inverter has a power code, which can be taken from the type code
(e.g. RD52.1-7N-022... => power code 22). In order that the pre-charging