Danfoss VLT 6000 HVAC Manual de Serviço descarregar pdf (Página 52)

VLT

6000 HVAC

MG.60.B1.02 - VLT is a registered Danfoss trade mark

■■

■ High voltage warning

The voltage of the frequency converter

is dangerous whenever the equipment

is connected to mains. Incorrect instal-

lation of the motor or the frequency converter may

cause damage to the equipment, serious personal

injury or death.

Consequently, the instructions in this Design Guide,

as well as national and local safety regulations, must

be complied with.

Touching the electrical parts may be fatal - even after

disconnection from mains:

Using VLT 6002-6005 wait at least 4 minutes and

using VLT 6006-6275 wait at least 15 minutes.

NB!

It is the user's or certified electrician's

responsibility to ensure correct earthing and

protection in accordance with applicable national and

local norms and standards.

■■

■ Earthing

The following basic issues need to be considered when

installing a frequency converter, so as to obtain

electromagnetic compatibility (EMC).

••

•

Safety earthing: Safety earthing:

Safety earthing: Please note that the frequency

converter has a high leakage current and must be

earthed appropriately for safety reasons. Apply

local safety regulations.

•

High-frequency earthing: High-frequency earthing:

High-frequency earthing: Keep the earth wire

connections as short as possible.

Connect the different earth systems at the lowest possible

conductor impedance. The lowest possible conductor

impedance is obtained by keeping the conductor as short

as possible and by using the greatest possible surface

area. A flat conductor, for example, has a lower HF

impedance than a round conductor for the same

conductor cross-section C

VESS

If more than one device is installed in cabinets, the

cabinet rear plate, which must be made of metal, should

be used as a common earth reference plate. The metal

cabinets of the different devices are mounted on the

cabinet rear plate using the lowest possible HF

impedance. This avoids having different HF voltages for

the individual devices and avoids the risk of radio

interference currents running in connection cables that

may be used between the devices. The radio

interference will have been reduced.

In order to obtain a low HF impedance, use the fastening

bolts of the devices as HF connection to the rear plate. It

is necessary to remove insulating paint or similar from

the fastening points.

■ Cables

Control cables and the filtered mains cable should be

installed separate from the motor cables so as to avoid

interference overcoupling. Normally, a distance of 20 cm

will be sufficient, but it is recommended to keep the

greatest possible distance wherever possible, especially

where cables are installed in parallel over a substantial

distance.

With respect to sensitive signal cables, such as

telephone cables and data cables, the greatest possible

distance is recommended with a minimum of 1 m per 5

m of power cable (mains and motor cable). It must be

pointed out that the necessary distance depends on the

sensitivity of the installation and the signal cables, and

that therefore no precise values can be stated.

If cable jaws are used, sensitive signal cables are not to

be placed in the same cable jaws as the motor cable or

brake cable.

If signal cables are to cross power cables, this should be

done at an angle of 90 degrees.

Remember that all interference-filled in- or outgoing

cables to/from a cabinet should be screened/armoured

or filtered.

Comentários a estes Manuais

Sem comentários

Danfoss VLT 6000 HVAC Manual de Serviço Página 52

Comentários a estes Manuais

Manuais e produtos relacionados com Adaptadores e conversores de corrente Danfoss VLT 6000 HVAC