Derating - Danfoss VLT 5000 Series Design Manual

Derating

Derating for ambient temperature
The ambient temperature (T
temperature allowed. The average (T
ured over 24 hours must be at least 5C lower.
• The current of VLT 5122-5552, 380-500 V
and VLT 5042-5352, 525-690 V, is to be de-
rated 1% / C above 45C maximum (160%
overload) and 40C maximum (110% over-
load). Max. temperature is 55° C.
Derating for Air Pressure
The Protective Extra Low Voltage (PELV)
requirements stated in IEC 61800-5-1 are
not fulfilled at altitudes above 2000 m
(6562 ft.). For 200V frequency converters
the requirements are not fulfilled at alti-
tudes above 5000 m (16 404 ft.). Please
contact Danfoss Drives for further infor-
mation.
Below 1000 m altitude no derating is necessary.
Above 1000 m the ambient temperature (T
output current (I ) must be derated in accord-
VLT,MAX
ance with the diagram below:
114
) is the maximum
AMB,MAX
) meas-
AMB,AVG
) or max.
AMB
®
VLT 5000 Design Guide
If the frequency converter is operated at temperatures
above 45C, a derating of the continuous output current
is necessary.
• The current of VLT 5402-5602, 525-690 V,
is to be derated 1.5% / C above 45C max-
imum (160% overload) and 40C maximum
(110% overload). Max. temperature is 55°
C.
1. Derating of output current versus altitude at
T = max. 45°C
AMB
2. Derating of max. T
100% output current.
®
MG.52.B2.02 - VLT is a registered Danfoss trademark
versus altitude at
AMB