Technical data
Typical values for the rise time and peak voltage
U
PEAK
are measured on the motor terminals between
two phases.
To obtain approximate values for cable lengths and
voltages not mentioned below, use the following rules
of thumb:
1. Rise time increases/decreases proportionally with
cable length.
2. U
PEAK
= DC link voltage x 1.9
(DC link voltage = Mains voltage x 1.35).
3.
dU
/
dt
=
0.5 ×
U
PEAK
Risetime
Data are measured according to IEC 60034-17.
VLT 2803-2815
Cable
length
Mains
voltage
Rise time
Peak
voltage
dU/dt
5 metres 220 V
137 μsec.
348 V
2.116 V/μsec.
42 metres 220 V
362 μsec.
460 V
1.016 V/μsec.
5 metres 240 V
129 μsec.
365 V
2.294 V/μsec.
42 metres 240 V
310 μsec.
498 V
1.303 V/μsec.
VLT 2805-2840
Cable
length
Mains
voltage
Rise time
Peak
voltage
dU/dt
5 metres 380 V
81 μsec.
680 V
6716 V/μsec.
15 metres 380 V
167 μsec.
960 V
4593 V/μsec.
30 metres 380 V
306 μsec.
992 V
2593 V/μsec.
5 metres 480 V
86 μsec.
840 V
7778 V/μsec.
15 metres 480 V
177 μsec.
1168 V
5279 V/μsec.
30 metres 480 V
323 μsec.
1232 V
3050 V/μsec.
VLT 2805-2840
Cable
length
Mains
voltage
Rise time
Peak
voltage
dU/dt
5 metres 380 V
120 μsec.
772 V
4438 V/μsec.
40 metres 380 V
188 μsec.
1004 V
3482 V/μsec.
78 metres 380 V
220 μsec.
1012 V
2854 V/μsec.
5 metres 480 V
120 μsec.
920 V
4667 V/μsec.
40 metres 480 V
245 μsec.
1252 V
3646 V/μsec.
78 metres 480 V
225 μsec.
1220 V
3168 V/μsec.
Acoustic noise
The acoustic noise from the frequency converter
comes from two sources:
1. DC intermediate circuit coils.
2. Integral fan.
Below are the typical values measured at a distance
of 1 m from the unit at full load:
VLT 2803-2815 1 x 220 V: 52 dB(A).
VLT 2822 1 x 220 V PD2:54 dB(A).
VLT 2840 1 x 220 V PD2: 55 dB (A).
VLT 2840 3 x 200 V PT2: 54 dB (A).
VLT 2803-2822 3 x 220 V: 52 dB(A).
VLT 2805-2840 3 x 400 V: 52 dB(A).
VLT 2855-2875 3 x 400 V: 54 dB(A).
VLT 2880-2882 3 x 400 V: 55 dB(A).
Derating for ambient temperature
The ambient temperature (T
AMB,MAX
) is the maximum
temperature allowed. The average (T
AMB,AVG
) meas-
ured over 24 hours, must be at least 5 °C lower. If the
frequency converter operates at temperatures above
45 °C, a derating of the rated output current is neces-
sary.
VLT
®
2800 Series
MG.27.E3.02 - VLT
®
is a registered Danfoss trademark 141
All about VLT 2800