VLT Installation
Rev.02
21
North America
Motion Controls
Confidential / Property of Danfoss Drives A/S
•
Use the index in the VLT Instruction Manual to find “Derating for
ambient temperature” a concern above 40°C (104°F)
•
Enclosure should be suitable for environment
•
Airborne contaminants and corrosive gases might require
conformal coating.
•
For Altitude use Instruction Manual index to find “Derating for
air pressure”, a concern above 1kM (3000 feet).
•
Vibration should be considered.
4) Installation Checks
b. Environmental Concerns
4) Installation Checks
b. Environmental Concerns
Because the drive relies on the ambient air for cooling, it is important to observe the
limitations on ambient air temperature and elevation mentioned in the Instruction
Manual.
Environmental concerns and derating start once the VLT goes above its 24-hour
average temperature rating or its maximum temperature rating. Derating is also
concerned when the elevation exceeds 1kM (3300 feet). More is explained on the
next slides.
Temperature equivalents
Heights equivalents
30°C = 86°F
1kM = 3300 feet
35°C = 95°F
2kM = 6600 feet
40°C = 104°F
3kM = 10,000 feet
45°C = 113°F
50°C = 122°F
55°C = 131°F
60°C = 140°F
65°C = 149°F
