Mounting The Unit; Environmental Requirements; General Environmental Requirements; High Altitude Installation - Danfoss Vacon NXP Series Operating Manual

Operating guide | VACON® NXS/NXP Air-cooled

5 Mounting the Unit

5.1 Environmental Requirements

5.1.1 General Environmental Requirements

In environments with airborne liquids, particles, or corrosive gases, ensure that the protection rating of the equipment matches the
installation environment. Failure to meet requirements for ambient conditions can reduce the lifetime of the AC drive. Ensure that
requirements for humidity, temperature, and altitude are met.
Vibration and shock
The AC drive complies with requirements for units mounted on the walls and floors of production premises, and in panels bolted to
walls or floors. For detailed ambient conditions specifications, see
Installation requirements:
• Make sure that there is sufficiently free space around the AC drive for cooling, see
Standalone AC drives (FR10 to
• Some free space is also necessary for maintenance.
• Make sure that the mounting surface is sufficiently flat.

5.1.2 High Altitude Installation

The density of air decreases when the altitude increases and the pressure decreases. When the air density decreases, the thermal
capacity decreases (that is, less air removes less heat) and the resistance to electric field (breakdown voltage/distance) decreases.
The full thermal performance of VACON
designed for installations up to 2000 m altitude.
Higher installation locations are possible, when obeying the derating guidelines in this chapter.
Above 1000 m, decrease the limited maximum load current by 1% for each 100 m. For example, at 2500 m altitude, decrease the load
current down to 85% of the rated output current (100% – (2500–1000 m) / 100 m x 1% = 85%).
When using fuses at high altitudes, the cooling effect of the fuse decreases as the density of the atmosphere decreases.
When using fuses above 2000 meters, the continuous rating of the fuse:
I = In*(1- (h-2000)/100*0.5/100)
Where
I = Current rating at high altitude
In = Rated current of a fuse
h = Altitude in meters
32 | Danfoss A/S © 2018.06
FR11).
®
NX AC drives is designed for installation up to 1000 m altitude. The electric insulation is
12.8 VACON NXP Technical Data.
5.2.2 Cooling of FR4 to FR9
Mounting the Unit
or 5.2.3 Cooling of
DPD00910G