Ip Rating Definitions; Radio Frequency Interference - Danfoss VLT AQUA Drive FC 202 Design Manual

System Integration
NOTICE!
Adjustable frequency drives with the MCB 112 option
have PTB-certified motor thermistor sensor monitoring
3 3
capability for potentially explosive atmospheres.
Shielded motor cables are not necessary when
adjustable frequency drives are operated with sine-wave
output filters.

3.1.8 IP Rating Definitions

First digit
Second
digit
First letter
Additional
letter
Table 3.3 IEC 60529 Definitions for IP Ratings
42
Against penetration by Against access to
solid foreign objects hazardous parts by
0 (not protected) (not protected)
≥50 mm diameter
1 Back of hand
2 12.5 mm diameter Finger
3 2.5 mm diameter Tool
4 ≥1.0 mm diameter Wire
5 Dust protected Wire
6 Dust-tight Wire
Against water
penetration with
harmful effect
0 (not protected)
1 Drops falling vertically
2 Drops at 15° angle
3 Spraying water
4 Splashing water
5 Water jets
6 Powerful water jets
7 Temporary immersion
8 Long-term immersion
Additional information
specifically for
A Back of hand
B Finger
C Tool
D Wire
Additional information
specifically for
H High-voltage device
M Device moving during
water test
S Device stationary during
water test
W Weather conditions
Danfoss A/S © 09/2014 All rights reserved.
®
VLT AQUA Drive FC 202
3.1.8.1 Cabinet Options and Ratings
Danfoss adjustable frequency drives are available with
three different protection ratings:
•
•
•

3.1.9 Radio Frequency Interference

The main objective in practice is to obtain systems that
operate stably without radio frequency interference
between components. To achieve a high level of immunity,
it is recommended to use adjustable frequency drives with
high-quality RFI filters.
Use Category C1 filters specified in the EN 61800-3 which
conform to the Class B limits of the general standard EN
55011.
Place warning notices on the adjustable frequency drive if
RFI filters do not correspond to Category C1 (Category C2
or lower). The responsibility for proper labeling rests with
the operator.
In practice, there are two approaches to RFI filters:
•
•
IP00 or IP20 for cabinet installation.
IP54 or IP55 for local mounting.
IP66 for critical ambient conditions such as
extremely high (air) humidity or high concen-
trations of dust or aggressive gases.
Built into the equipment
- Built-in filters take up space in the
cabinet but eliminate additional costs
for fitting, wiring, and material. However,
the most important advantage is the
perfect EMC conformance and cabling
of integrated filters.
External options
-
Optional external RFI filters that are
installed on the input of the adjustable
frequency drive cause a voltage drop. In
practice, this means that the full AC line
voltage is not present at the adjustable
frequency drive input and a higher-rated
drive may be necessary. The maximum
length of the motor cable for
compliance with EMC limits ranges from
1–50 m (3.3–164 ft). Costs are incurred
for material, cabling, and assembly. EMC
conformance is not tested.
MG20N622