Special Conditions; Purpose Of Derating; Derating For Ambient Temperature; Derating For Ambient Temperature, Enclosure Type A - Danfoss VLT FC 102 Series Design Manual

General Specifications and ...

9.6 Special Conditions

9.6.1 Purpose of Derating

Take derating into account when using the adjustable
frequency drive at low air pressure (high altitudes), at low
speeds, with long motor cables, cables with a large cross-
section or at high ambient temperature. This section
describes the actions required.

9.6.2 Derating for Ambient Temperature

90% adjustable frequency drive output current can be
maintained up to max. 122 °F [50 °C] ambient
temperature.
With a typical full load current of IE2 motors, full output
shaft power can be maintained up to 122 °F [50 °C].
For more specific data and/or derating information for
other motors or conditions, contact Danfoss.
9.6.3 Derating for Ambient Temperature,
9 9
Enclosure Type A
60° AVM - Pulse Width Modulation
I out (%)
110%
100%
80%
60%
40%
20%
0
0 2
Figure 9.3 Derating of I
Enclosure Type A, using 60° AVM
186
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)
4 6 8 10 12 14 16
for Different T
out AMB, MAX
Danfoss A/S © Rev. 06/2014 All rights reserved.
Design Guide
SFAVM - Stator Frequency Asyncron Vector Modulation
I
110%
100%
80%
60%
40%
20%
0
0
Figure 9.4 Derating of I
Enclosures Type A, using SFAVM
When using only 33 ft [10 m] 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 9.5 Derating of I
Enclosures Type A, using 60° AVM and maximum 32 ft [10 m]
motor cable
for
SFAVM
I
110%
100%
80%
60%
40%
20%
0
0
Figure 9.6 Derating of I
Enclosures Type A, using SFAVM and maximum 32 ft [10 m]
motor cable
(%)
out
2 4 6 8 10 12 14
for Different T
out
(%)
2 4 6 8 10 12 14
for Different T
out
(%)
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
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
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
AMB, MAX
MG11BC22