Danfoss VLT AHF 005 Design Guide

3.2 Enclosure Protection Ratings
The VLT
®
drive series are available in various enclosure protection to accommodate the needs of the application. Enclosure
protection ratings are provided based on 2 international standards:
•
UL type validates that the enclosures meet NEMA (National Electrical Manufacturers Association) standards. The
construction and testing requirements for enclosures are provided in NEMA Standards Publication 250-2003 and UL
50, Eleventh Edition.
•
IP (Ingress Protection) ratings outlined by IEC (International Electrotechnical Commission) in the rest of the world.
Standard Danfoss VLT
®
drive series are available in various enclosure protections to meet the requirements of IP00 (Chassis),
IP20 (Protected chassis) or IP21 (UL Type 1), or IP54 (UL Type 12). In this manual, UL Type is written as Type. For example,
IP21/Type 1.
UL type standard
Type 1 – Enclosures constructed for indoor use to provide a degree of protection to personnel against incidental contact
with the enclosed units and to provide a degree of protection against falling dirt.
Type 12 – General-purpose enclosures are intended for use indoors to protect the enclosed units against the following:
•
Fibers
•
Lint
•
Dust and dirt
•
Light splashing
•
Seepage
•
Dripping and external condensation of noncorrosive liquids
There can be no holes through the enclosure and no conduit knockouts or conduit openings, except when used with oil-
resistant gaskets to mount oil-tight or dust-tight mechanisms. Doors are also provided with oil-resistant gaskets. In addition,
enclosures for combination controllers have hinged doors, which swing horizontally and require a tool to open.
IP standard
Table 3.2 provides a cross-reference between the 2 standards. Table 3.3 demonstrates how to read the IP number and then
denes the levels of protection. The drives meet the requirements of both.
NEMA and UL IP
Chassis IP00
Protected chassis IP20
Type 1 IP21
Type 12 IP54
Table 3.2 NEMA and IP Number Cross-reference
Approvals and Certication...
VLT
®
HVAC Drive FC 102
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33

Danfoss VLT AHF 005 Specifications

General

Brand	Danfoss
Model	VLT AHF 005
Category	DC Drives
Language	English