Automatic Adaptations To Ensure Performance - Danfoss VLT FC 102 Series Design Manual

General Specifications and ...
SFAVM - Stator Frequency Asyncron Vector Modulation
l (%)
out
NO
110%
100%
90%
80%
60%
40%
20%
0
0 1
Figure 9.21 Output current derating with switching frequency
and ambient temperature for 600 V adjustable frequency
drives, enclosure type C, SFAVM, NO
9.6.5.3 Enclosure Type C, T7
60° AVM - Pulse Width Modulation
9 9
I out (A)
34
28.9
27.2
20.4
13.6
1
Figure 9.22 Output current derating with switching frequency
and ambient temperature for enclosure type C2, 60° AVM.
Note: The graph is drawn with the current as absolute value
and is valid for both high and normal overload.
190
o
45 C
o
50 C
2 4 6 8
C2
45°C
50°C
55°C
2 4 6 8
Danfoss A/S © Rev. 06/2014 All rights reserved.
Design Guide
SFAVM - Stator Frequency Asyncron Vector Modulation
I
out
100
86.6
80
C1 & C2
66.6
60
40
20
f
(kHz)
sw
Figure 9.23 Output current derating with switching frequency
10
and ambient temperature for enclosure type C2, SFAVM. Note:
The graph is drawn with the current as absolute value and is
valid for both high and normal overload.
9.6.6 Automatic Adaptations to Ensure
Performance
The adjustable frequency drive constantly checks for
critical levels of internal temperature, load current, high
all options
voltage on the intermediate circuit and low motor speeds.
As a response to a critical level, the adjustable frequency
drive can adjust the switching frequency and/or change
the switching pattern to ensure the performance of the
adjustable frequency drive. The capability for automatic
output current reduction extends the acceptable operating
conditions even further.
f sw (kHz)
10
(A)
45°C
50°C
55°C
1 2 4 6 8
C2 all options
f (kHz)
sw
10
MG11BC22