Schneider Altivar 71 VW3A7201 handleiding

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Handleiding

1757361 06/2012 23

Connection diagrams, fuses and associated cables

The connections can be accessed by removing the side screws and connection terminal cover from the unit. The cables must pass through

a cable gland located on the wiring plate.

Electrical power supply

Fuses

The braking unit is equipped with fuses for semi-conductors.

• The on-load voltage drop must be taken into consideration when choosing the cable cross-section (See section “Checking the

installation”, page 6

• Protection of the braking unit cables (L1,L2,L3) and the connections to the line supply:

- by commercially available cable protection fuses

- the fuses must comply with the appropriate standards for the site.

- the nominal voltage of the fuse must comply with the voltages for the site.

• Protection of the braking unit and the connections to the DC bus (+UG,-UG):

- The fuses are part of the braking unit

The installer/user of the circuit is responsible for compliance with the appropriate standards.

Connections

• All the connections must be a short as possible and have a low impedance.

• Shielded cables must be used in order to comply the EMC directives (in accordance with current standards such as EN 61800.3).

• Connect the line supply (line reactor) to terminals L1, L2 and L3 on the braking unit. Only a three-phase supply is permitted.

• A defined phase sequence (indirect rotation of the field) must be followed when connecting the braking unit to the line supply. The braking

unit has a phase sequence check. If the rotating field is incorrect, an error message is displayed via an LED as follows: "incorrect phase

rotation direction" or "phase loss". In this case, two phases connected to the braking unit must be inverted.

• Connect the ground of the power supply cables to the ground connection screw on the braking unit.

• The DC bus wires used to connect the drive and braking unit must be connected to the DC fuse carrier. It is essential to comply with the

correct polarities.

CAUTION

RISKS OF INTERFERENCE

When you remove the cover, take care not to damage the cables that lead to the display.

Failure to follow this precaution can result in equipment damage.

WARNING

• Overcurrent protective devices must be properly coordinated.

• Use the fuses recommended in this document.

Failure to follow these instructions can result in death or serious injury.

The inversion of the + (PLUS) and the - (MINUS) will prevent correct operation of the braking unit.

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