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General Instructions
2.3 ABOUT THE UR11
The rectifier unit UR11 provides DC voltage to feed the CFW-11M inverters. The UR11 can also be used to
provide power to other devices that require DC link voltage. The main feature of this product is the two built-in
complete semi-controlled rectifier bridges, which have the advantages presented next:
DC link pre-charge control, provided by the control of the thyristors firing angle through a microcontroller:
the pre-charge provides a linear voltage ramp, avoiding high currents and eliminating the pre-charge circuit
of the panels.
The independent control of each rectifier unit of the UR11, together with the two triphasic chokes with
2
3 % voltage drop, allows the use of this product in applications where 12-pulse rectifier configuration is
required by simply connecting the power cables properly (for details, see
CONNECTION on page
The UR11 product line with its modular structure (book type) is very similar to the CFW-11M power units (UP11),
which makes it very appropriate for the assembly in panels with the CFW-11M inverter line. Each rectifier unit
is able to provide power to two UP11 power units. In order to feed more than two UP11 it is just necessary to
add more rectifier units in parallel proportionally.
Figure 2.1 on page 2-4
page 2-5
presents an example of diagram for a 12 pulse rectifier operation.
2-4 | UR11
3-1).
presents an example of diagram for a 6 pulse rectifier operation and
UR11
L1
R1, S1, T1
F1, F2, F3
Figure 2.1 - Example of diagram of a 6 pulse configuration with one rectifier unit
+UD, -UD
L2
R2, S2, T2
F4, F5, F6
R, S, T
Power
supply
3∼
chapter 3 INSTALLATION AND
Figure 2.2 on
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