Bosch Rexroth IndraDrive MPH-02 Functional Description page 294

6-82
Drive Control
Group Supply
Communication in Drive Group
Note Regarding Converters
Regenerated Energy
Braking Resistor
Description of Hardware
The figure below illustrates the principle of group supply:
converter converter
module bus module bus
3 3
mains connection
Fig. 6-56: Mains supply via all devices
Depending on the task of a drive system or of several drives cooperating
in a process, it can be appropriate to rapidly carry out a common reaction
to certain events. This requires the exchange of signals (communication)
between the cooperating devices. For this purpose, IndraDrive devices
are interconnected via the module bus.
A converter combines supply unit and inverter in one device. In a "drive
system" (several drives the DC buses and module buses of which are
interconnected) a converter can fulfill the following functions:
• supplying its integrated inverter and further inverters
- or -
• operation only as inverter on a DC bus (only for HCS02.1)
In the case of regenerative operation (e.g. braking operation) of the
motors connected to a drive controller, the regenerated energy is first
absorbed by the DC bus. Depending on the supply unit or supply section,
the absorbed energy is regenerated to the supply mains or converted to
heat via a braking resistor.
The braking resistor is connected on the DC bus side. Depending on the
device line, an internal braking resistor is available or an external braking
resistor can be connected.
As regards hardware, connections and signals, the module bus is
described in the documentations of the devices (Project Planning
Manuals).
Note: Recommendations on mains connection and control of the
power supply, including external braking resistor and DC bus
short circuit, are contained in the documentation of the supply
units (HMV type) and converters (HCS type).
MPH-02, MPB-02, MPD-02
converter converter
module bus
+24 V
control voltage
0 V
L +
power voltage
(DC bus)
L -
3 3
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