Derating For Long Motor Cables Or Cables With Larger Cross-Section; Derating For Ambient Temperature - Danfoss VLT AQUA Drive FC 202 Design Manual

Special Conditions
Max.I (%)
out
at T
AMB, MAX
100%
96%
92%
5 5
Figure 5.2 Derating of Output Current versus Altitude at T
for Enclosure Sizes D3h.
MAX
5.2 Derating for Long Motor Cables or
Cables with Larger Cross-Section
NOTICE!
Applicable for adjustable frequency drives up to 90 kW
(125 hp) only.
The maximum cable length for this adjustable frequency
drive is 300 m (984 ft) for non-shielded cable, and 150 m
(492 ft) for shielded cable.
The adjustable frequency drive has been designed to
work using a motor cable with a rated cross-section. If a
cable with a larger cross-section is used, reduce the
output current by 5% for every step the cross-section is
increased.
Increased cable cross-section leads to increased capacity
to ground, and thus an increased ground leakage
current.

5.3 Derating for Ambient Temperature

The average temperature (T
hours must be at least 5 °C (9 °F) lower than the maximum
permitted ambient temperature (T
frequency drive operates at high ambient temperatures,
then decrease the continuous output current. Derating
depends on the switching pattern, which can be set to 60°
AVM or SFAVM in 14-00 Switching Pattern.
116
T
AMB, MAX
at 100% I
D, E and F enclosures
HO
0 K
-3 K
-6 K
1 km 2 km 3 km
Altitude (km)
) measured over 24
AMB, AVG
). If the adjustable
AMB,MAX
Danfoss A/S © 09/2014 All rights reserved.
®
VLT AQUA Drive FC 202
5.3.1 Derating for Ambient Temperature,
Enclosure Size A
out
NO
60° AVM – Pulse Width Modulation
-5 K
I out (%)
110%
100%
-8 K
80%
-11 K
60%
40%
20%
0
AMB,
0
Figure 5.3 Derating of I
Size A, using 60° AVM
SFAVM – Stator Frequency Asyncronous Vector
Modulation
I
out
110%
100%
80%
60%
40%
20%
0
0
Figure 5.4 Derating of I
Type A, using SFAVM
When using only 10 m (33 ft) motor cable or less in
enclosure size A, less derating is necessary. This is due to
the fact that the length of the motor cable has a relatively
high impact on the recommended derating.
60° AVM
I
out
110%
100%
80%
60%
40%
20%
0
0
Figure 5.5 Derating of I
Type A, using 60° AVM and Maximum 10 m (33 ft) Motor
Cable
2 4 6 8 10 12 14
for Different T
out
(%)
2 4 6 8 10 12 14
for Different T
out
(%)
2 4 6 8 10 12 14
for Different T
out
A1-A3 45°C, A4-A5 40°C
A1-A3 50°C, A4-A5 45°C
A1-A3 55°C, A4-A5 50°C
f sw (kHz)
16
for Enclosure
AMB, MAX
A1-A3 45°C, A4-A5 40°C
A1-A3 50°C, A4-A5 45°C
A1-A3 55°C, A4-A5 50°C
f sw (kHz)
16
for Enclosures
AMB, MAX
A1-A3 45°C, A4-A5 40°C
A1-A3 50°C, A4-A5 45°C
A1-A3 55°C, A4-A5 50°C
f sw (kHz)
16
for Enclosures
AMB, MAX
MG20N622