Derating Specifications - Danfoss VLT 380-500 V Design Manual

Specifications

6.12 Derating Specifications

Consider derating when any of the following conditions are present.
•
Low air pressure operating above 1000 m (3281 ft)
•
High ambient temperature
•
High switching frequency
•
Low-speed operation
•
Long motor cables
•
Cables with a large cross-section
If these conditions are present, Danfoss recommends stepping up 1 power size.
6 6
6.12.1 Derating for Altitude
Below 1000 m 1000 m (3281 ft), derating is not necessary.
Above 1000 m 1000 m (3281 ft), the ambient temperature (T
accordance with Illustration 6.19.
1. Derating of output current versus altitude
2. Derating of maximum T
Illustration 6.19 Derating for Altitude
58
®
VLT Parallel Drive Modules
AMB
versus altitude at 100% output current.
AMB
I (%)
OUT
100
95
90
85
80
0 500 1000 1500
Altitude (metres above sea level)*
Danfoss A/S © 6/2016 All rights reserved.
) or maximum output current (I
2000 2500 3000
) must be derated in
MAX
MG37N102