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• DOK-POWER*-TVD*1.3****-ANW1-EN-E1,44 • 02.97
1. Construction of the Modular AC Drive System
1.1. Main functions of the TVD 1.3
The high-voltage link rectifies the three-phase mains AC and provides a
regulated DC bus circuit voltage for the power feed to the drives. A buffer
capacitor takes care of any necessary smoothing.
When the drives are in generator mode, the regenerated power is absorbed
by the bleeder resistor and transformed into heat.
The drives can be disconnected from the mains by the TVD's internal power
contactor.
The TVD 1.3 provides the +24VL and +/-15VM for all connected drive
modules.
In the event of a power failure, the signal voltages are supplied from the DC
bus circuit. Therefore, as the drives operate as a generator, the electronics of
the drives remain functional.
The TVD 1.3 is equipped with extensive monitoring functions. These
communicate with the drive modules via the wire ribbon cable.
The Bb1 contact is critical to the ready state of the drive system. The power
contactor cannot be energized until the Bb1 contact is closed.
Power supply to the
drives
Supply to the
electronics
Drive system
monitoring
DC
DC
1U1
1V1
1W1
K1
Power source and
monitoring of drives
Drives ready
Power supply ready
&
Bb1
~
=
DC bus s.c.
Bleeder
320 V DC
as power
source of
drives
AufbauTVR3
Fig. 1.2:
The basic construction of the TVD 1.3
