JVL MAC050 - Page 384

380 JVL A/S - User Manual - Integrated Servo Motors MAC050 - 4500
6.6 Installation instructions
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.
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.
Derating of MAC or MIS motors as
f
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Height above sea level (m) =<1000
1
5
0
0
2
0
0
0
2
5
0
0
3
0
0
0
3
5
0
0
4
0
0
0
4
5
0
0
5
0
0
0
Height above sea level (ft) =< 3281
4
9
2
1
6
5
6
2
8
2
0
2
9
8
4
3
1
1
4
8
3
1
3
1
2
3
1
4
7
6
4
1
6
4
0
4
Power rating % 100
9
6
9
2
8
8
8
4
8
0
7
6
7
2
6
8