Special Conditions; Derating For Ambient Temperature And Switching Frequency; Derating For Low Air Pressure And High Altitudes - Danfoss VLT CDS 803 Operating Manual

Operating Guide | VLT® Compressor Drive CDS 803
Table 21: EMC Emission Test Results
RFI filter Conduct emission. Maximum shielded cable length [m
type (ft)]
EN Class A Group 2
55011
Industrial envi-
ronment
EN/IEC Category C3
61800-3
Second environ-
ment Industrial
With‐ With
out ex‐ exter‐
ternal nal
filter filter
H4 RFI filter (EN 55011 A1, EN/IEC61800-3 C2)
6.0– 10 – –
kW (8.0–
15 hp)
3x200–
240 V
IP20
H2 RFI filter (EN 55011 A2, EN/IEC 61800-3 C3)
18–30 kW 5 (16.4) –
(25– 40
hp)
3x380–
480 V
IP20

6.4 Special Conditions

6.4.1 Derating for Ambient Temperature and Switching Frequency

Ensure that the ambient temperature measured over 24 hours is at least 5 °C (41 °F) lower than the maximum ambient temperature
that is specified for the drive. If the drive is operated at a high ambient temperature, decrease the constant output current. For derating
curve, see the VLT® Compressor Drive CDS 803 Design Guide.

6.4.2 Derating for Low Air Pressure and High Altitudes

The cooling capability of air is decreased at low air pressure. For altitudes above 2000 m (6562 ft), contact Danfoss regarding PELV.
Below 1000 m (3281 ft) altitude, derating is not necessary. For altitudes above 1000 m (3281 ft), decrease the ambient temperature or
the maximum output current. Decrease the output by 1% per 100 m (328 ft) altitude above 1000 m (3281 ft) or reduce the maximum
ambient temperature by 1 °C (33.8 °F) per 200 m (656 ft).
Danfoss A/S © 2019.12
Class A Group 1 Class B
Industrial envi- Housing, trades,
ronment and light indus-
tries
Category C2 Category C1
First environ- First environ-
ment Home and ment Home and
office office
With‐ With With‐
out ex‐ exter‐ out
ternal nal exter‐
filter filter nal fil‐
ter
25 (82) 50 –
(164)
– – –
Radiated emission
Class A Group 2
Industrial envi-
ronment
Category C3
Second environ-
ment Industrial
With With‐ With
exter‐ out exter‐
nal exter‐ nal
filter nal fil‐ filter
ter
20 – –
(66)
– Yes –
Specifications
Class A Group 1 Class B
Industrial envi- Housing, trades,
ronment and light indus-
tries
Category C2 Category C1
First environ- First environ-
ment Home and ment Home and
office office
With‐ With With‐
out exter‐ out
exter‐ nal exter‐
nal fil‐ filter nal fil‐
ter ter
Yes Yes –
No – No
AQ321748767627en-000101 / 130R0570| 45
With
exter‐
nal
filter
No
–