3
MVW01 WITH 3 LEVELS (3L)
✓
NOTE!
The values shown in Table 3.1 on page 3-3 are standard values, however, they may change due to the special characteristics
of the product:
Input switchgear;
Columns for dynamic braking;
Exciter column (for synchronous machines);
Output filters;
Input filters (AFE);
Additional inverter column (AFE);
Additional column for cables connection (input and output);
Special grounding and safety systems;
Special cooling system;
The panel cooling is achieved by means of forced ventilation. The cold air enters through the grids located at the front doors, passes through
the power section heatsinks, and the hot air is exhausted at the panel tops where the fans are installed.
The MVW01 has been designed to comply with the CEI – IEC 61800 (part 4 and 5) standard.
The MVW01 is appropriate for operation in industrial environments, with resistance to chemical agents and to corrosion.
The cabinet is built with painted steel plates that are processed (cutting, drilling, bending, chemical treatment, painting and finishing) at WEG,
assuring the cabinet quality. The inverter parts that are not painted are zinc plated or have another suitable treatment in order to assure their
resistance against corrosion.
The internal frame is composed by gauge #12 sheet steel (2.65 mm (0.10 in)) whereas the doors and closures are composed by gauge #14
sheet steel. The protection degree is IP21, for indoors environment.
The cooling air enters the panel through front openings protected by grids (one internal and another external) with air filters.
Filter cleaning or replacement can be done by removing the external grid with no need to open the doors and to interrupt the inverter operation.
The internal grid with openings smaller than 10 mm prevents the access to the medium voltage compartment.
The hot air exhaustion occurs at the panel top where the exhausting fans are located, making service possible without opening the medium
voltage compartment doors.
The medium voltage compartments (input rectifier and inverter) are mechanically and electrically interlocked in order to prevent the access to all
the components that are able to present electric shock danger. Only after closing the rectifier and the inverter stage doors it becomes possible
to lock them by means of a mechanical interlocking device located at the control stage. This device has an electric switch that, once closed,
enables the MVW01 medium voltage energization. The door opening while the inverter is energized is not allowed.
In the event of door unlocking, the inverter disables the operation and switches off the input circuit breaker. The control stage is fed by an
auxiliary power supply (220 V - 690 V) and can be locked in order to prevent access.
3.2 INPUT RECTIFIER
There are electronic boards in the rectifier column destined to attenuate, measure, convert into frequency and send the following signals, via
fiber optic cables, to the control column:
2 input transformer secondary line voltages.
2 temperature of rectifiers heatsink.
2 DC link voltages (+UD and -UD) referenced to the medium point (MP).
The voltage between medium point and ground.
These boards as well as the boards and DC/DC converters present in the inverter arm are fed with 15 Vdc by the PS1/PS1S, and this power
supply being fed by the secondary of the high insulation transformer T3.
The medium voltage cables for the input rectifier (A1) supply come from the input transformer secondary windings. The transformer configuration
and the number of cables depend on the rectifier number of pulses:
12 pulses 6 cables.
18 pulses 9 cables.
24 pulses 12 cables.
36 pulses 18 cables.
MVW01 | 3-4
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