Danfoss VLT Training Manual page 26

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VLT Installation

4) Installation Checks

b. Environmental Concerns

The VLT can be supplied with a chassis, NEMA 1 (IP 20, 21) or NEMA 12 (IP 54)

enclosure. These enclosures provides some degree of protection from falling dust

and water. Therefore, drives with a NEMA 1 (IP 20) and 12 (IP 54) enclosures should

be mounted indoors in a relatively clean and dry location. If the application requires

a NEMA 4 (IP 65) enclosure, the VLT can be placed inside a NEMA 4 cabinet. Other

cabinets can be used to protect the VLT if there are requirements for NEMA 4X or

NEMA 3R.

The chart above shows the International Protection (IP) standard for dust (the first

digit) and water (the second digit). Shown below is the approximate NEMA

equivalents to the IP standards

Enclosure equivalent

IP 00 = chassis

IP 20, 21 = NEMA 1

IP 54 = NEMA 12

IP 65 = NEMA 4

Rev.02

b. Environmental Concerns

Environmental Concerns - Enclosure Types

– Book style/Chassis

– Protected Chassis

– NEMA 1

– NEMA 12

– NEMA 4

Confidential / Property of Danfoss Drives A/S

IP 00

IP 20

IP 21

IP 54

IP 65

North America

Motion Controls

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