•
•
Cooling fans
The airflow for cooling the unit is produced by cooling fans, usually on the back of the unit. The fan rotors have small bearings into
which dust can penetrate and act as an abrasive. This leads to bearing damage and fan failure.
Periodic maintenance
Under the conditions described above, it is recommended to clean the drive during periodic maintenance. Remove dust from the
heat sink and fans.
5.3.3 Air Humidity
The drive has been designed to meet the IEC/EN 60068-2-3 standard, EN 50178 9.4.2.2 at 50 °C (122 °F).
5.3.4 Vibration and Shock
The drive has been tested according to the following standards:
IEC/EN 60068-2-6: Vibration (sinusoidal) - 1970
IEC/EN 60068-2-64: Vibration, broad-band random
The drive complies with the requirements that exist for units mounted on the walls and floors of production premises, and in panels
bolted to walls or floors.
5.3.5 Derating for Ambient Temperature and Switching Frequency
Ensure that the ambient temperature measured over 24 h is at least 5 °C (9 °F) lower than the maximum ambient temperature that
is specified for the drive. If the drive is operated at high ambient temperature, decrease the constant output current. If the ambient
temperature is higher than 50 °C (122 °F) or the installation by altitude is higher than 1000 m (3281 ft), a larger VLT® Compressor
Drive CDS 803 might be needed to run an undersized compressor. Consult Danfoss for support.
5.3.5.1 Derating Curves, 6.0, 7.5, and 10 kW
fsw[kHz]
20 10
0
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
110 %
I
out[%]
16
5
e30bh856.10
40
45
50
o
C
o
C
o
C
104
o
F
113
o
F
122
o
F
Illustration 19: 400 V IP20 H3 6.0–7.5 kW (8.0–10 hp)
fsw[kHz]
20 10
0
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
110%
I
out[%]
16
40
45
50
5
o
C
o
C
o
C
e30bh857.10
Illustration 20: 200 V IP20 H4 6.0–7.5 kW (8.0–10 hp)
AJ330233902305en-000201 / 130R0596 | 39Danfoss A/S © 2021.05
Mechanical Installation
Considerations
VLT® Compressor Drive CDS 803
Design Guide
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