JVL MAC050 User Manual page 384

6.6
6.6.2 Operation at higher altitudes
Since the air density at higher altitudes is lower it becomes more difficult for the motor
to dissipate the heat losses to the surrounding air.
If an installation is done at more than 1000m (3281ft) the output power is de-rated as
shown below in the table.
Derating of MAC or MIS motors as function of altitude
Height above sea level (m)
Height above sea level (ft)
Power rating %
Example:
A MAC400 motor with a nominal power rating of 400W is operating in an altitude of
2500m above sea level.
The power rating at this level is 88% which means that the nominal power is de-rated
to 352W.
Since the heat dissipation in the motor and electronics is primarily influenced by the ac-
tual torque it is recommended to lower the torque to keep within the maximum power.
The speed can be kept at the nominal value.
380
Installation instructions
=< 1000
=< 3281
100
JVL A/S - User Manual - Integrated Servo Motors MAC050 - 4500
1500 2000 2500
4921 6562 8202
96 92 88
3000 3500 4000
9843 11483 13123
84 80 76
4500 5000
14764 16404
72 68