Danfoss VLT Series Design Manual page 58

3. VLT HVAC Selection
Surroundings:
Enclosure ≤ enclosure type A
Enclosure ≥ enclosure type A, B
Enclosure kit available ≤ enclosure type A
Vibration test
Max. relative humidity
3
Aggressive environment (IEC 721-3-3), uncoated
Aggressive environment (IEC 721-3-3), coated
Test method according to IEC 60068-2-43 H2S (10 days)
Ambient temperature
Derating for high ambient temperature, see section on special conditions
Minimum ambient temperature during full-scale operation
Minimum ambient temperature at reduced performance
Temperature during storage/transport
Maximum altitude above sea level without derating
Maximum altitude above sea level with derating
Derating for high altitude, see section on special conditions
EMC standards, Emission
EMC standards, Immunity
See section on special conditions
Control card performance:
Scan interval
Control card, USB serial communication:
USB standard
USB plug
3.2.1. Efficiency
Efficiency of VLT HVAC Drive Series (η
The load on the frequency converter has little effect on its efficiency. In general, the efficiency is
the same at the rated motor frequency f
torque or only 75%, i.e. in case of part loads.
This also means that the efficiency of the frequency converter does not change even if other U/f
characteristics are chosen.
However, the U/f characteristics influence the efficiency of the motor.
The efficiency declines a little when the switching frequency is set to a value of above 5 kHz. The
efficiency will also be slightly reduced if the mains voltage is 480 V, or if the motor cable is longer
than 30 m.
58
5% - 95%(IEC 721-3-3; Class 3K3 (non-condensing) during operation
EN 61000-4-2, EN 61000-4-3, EN 61000-4-4, EN 61000-4-5, EN
Connection to PC is carried out via a standard host/device USB cable.
The USB connection is galvanically isolated from the supply voltage (PELV) and other
high-voltage terminals.
The USB connection is not galvanically isolated from protection earth. Use only iso-
lated laptop/PC as connection to the USB connector on VLT HVAC Drive or an isolated
USB cable/converter.
M,N
MG.11.B2.02 - VLT
EN 61800-3, EN 61000-6-3/4, EN 55011, IEC 61800-3
EN 61800-3, EN 61000-6-1/2,
)
VLT
, even if the motor supplies 100% of the rated shaft
®
is a registered Danfoss trademark
®
VLT HVAC Drive Design Guide
IP 20, IP 55
IP 21, IP 55
IP21/TYPE 1/IP 4X top
1.0 g
class 3C2
class 3C3
Max. 50 °C
0 °C
- 10 °C
-25 - +65/70 °C
1000 m
3000 m
61000-4-6
: 5 ms
1.1 (Full speed)
USB type B "device" plug