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

General Specifications and ...
Cable
length [m]
5
50
100
150
Table 9.28 Frequency converter, P37K, T4
Cable
length [m]
36
50
100
150
Table 9.29 Frequency converter, P45K, T4
Cable
length [m]
10
Table 9.30 Frequency converter, P55K, T4
9 9
Cable
length [m]
5
Table 9.31 Frequency converter, P75K, T4
Cable
length [m]
5
Table 9.32 Frequency converter, P90K, T4

9.6 Special Conditions

9.6.1 Purpose of Derating

Take derating into account when using the frequency
converter 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% frequency converter output current can be
maintained up to max. 50 °C ambient temperature.
With a typical full load current of IE2 motors, full output
shaft power can be maintained up to 50 °C.
For more specific data and/or derating information for
other motors or conditions, contact Danfoss.
164
Design Guide
Rise time
Mains
voltage [μsec]
480 0.270
480 0.435
480 0.840
480 0.940
Rise time
Mains
voltage [V] [μsec]
400 0.254
400 0.465
400 0.815
400 0.890
Mains Rise time
voltage [V] [μsec]
400 0.350
Rise time
Mains
voltage [V] [μsec]
480 0.371
Rise time
Mains
voltage [V] [μsec]
400 0.364
Danfoss A/S © Rev. 06/2014 All rights reserved.
dU/dt
Vpeak
[kV] [kV/μsec]
1.276 3.781
1.184 2.177
1.188 1.131
1.212 1.031
dU/dt
Vpeak
[kV] [kV/μsec]
1.056 3.326
1.048 1.803
1.032 1.013
1.016 0.913
Vpeak dU/dt
[kV] [kV/μsec]
0.932 2.130
Vpeak
[kV]
1.170
Vpeak
[kV]
1.030
9.6.3 Derating for Ambient Temperature,
Enclosure Type A
60° AVM - Pulse Width Modulation
I out (%)
110%
100%
80%
60%
40%
20%
0
0 2 4 6 8 10
Illustration 9.3 Derating of I
out
Enclosure Type A, using 60° AVM
dU/dt
[kV/μsec]
2.466
dU/dt
[kV/μsec]
2.264
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)
12 14 16
for Different T for
AMB, MAX
MG11BC02