Functional Description; Block Diagram Of The Supply Unit; Switch-On Procedure; Power-Off The Supply Unit - KEB COMBIVERT Betriebsanleitung

Functional Description

6.
6.1
Current measurement
Cooling fan set
R0.F4.T89-1209
6.2
6.3
GB - 44
Functional Description

Block Diagram of the Supply Unit

B6 preload
rectifier
Current
supply
Main thyristors

Switch-on procedure

The charging procedure of the connected frequency inverters starts with releasing
mains voltage to the input terminals L1, l2, L3 and starting of the control. The
pre-charging occurs via a current source, which enables loading of very high
DC link capacities. The obtained charging time is depending on the value of the
connected DC link capacities and the mains voltage. After executed pre-charging
and checking the ground fault free at the DC bus the release of the thyristor
block takes place. No phase angle control is executed, the thyristors are driven
with 0° control angle, so the behaviour is like a B6-rectifier bridge.
The "RUN" - signal is set at the control terminals of the power supply unit and
can be processed further by the master control. A load current may only be
taken from the power supply unit after setting the "RUN" - signal, since otherwise
a power off of the pre-charging unit occurs and an error message is output.

Power-Off the Supply Unit

Power-off occurs by disconnecting the mains voltage and/or the starting signal
at the control card at the supply unit.
Ready for
operation
Pre warning
Hear sink
temperature
Electronic
supply
DC-Fuse
(Option)