Danfoss VLT 2030 User Manual

MG.20.B6.02 – VLT is a registered Danfoss trademark
95
VLT
®
2000 Series
Section 1 Section 2 Section 3
Derating for air pressure
Below 1,000 metres altitude no derating is necessary.
Above 1,000 metres the T
amb
or maximum output
power must be derated according to the figure below.
1. Derating of output current versus altitude at T
amb
40 ° C.
2. Derating of max. T
amb
versus altitude at 100% output current.
Derating for running at low speed
No derating is necessary when running the motor at
rated speed, or when controlling a fan or centrifugal
pump.
Motors running at constant load torque (CT) used at
low speed must be derated or fan-cooled (see dia-
gram).
Typical motor derating
Therefore the VLT frequency converter automatically
reduces the maximum continous output current I
VLT,N
when the switching frequency exceeds 4.5 kHz. The
reduction is done linearly to 60% at 16 kHz (see dia-
gram). The maximum permitted motor cable length is
40 m of screened cable.
Derating for higher switching frequency
Derating for air pressure
Special conditions
4.5 16
100%
60%
20%
2
➤➤ ➤➤
➤
➤➤
➤➤
➤
I
VLT
f
sw
[kHz]
Derating for higher switching frequency
than 4.5 kHz
A higher switching frequency means higher losses
and increased heat generation in the transistors and
motor coils of the frequency converter.
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Danfoss VLT 2030 Specifications

General

Brand	Danfoss
Model	VLT 2030
Category	Inverter
Language	English