Technical information vacon • 57
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5
5.2.5 OL(
n
base
) < OL(
n
max
) for constant power load
It is possible to set the overload at base speed smaller than the overload at max speed, i.e. OL(
n
base
)
< OL(
n
max
).
This can be useful when selecting the correct motor and AC drive for constant power drives where
the relative OL requirement is higher at maximum speed than the relative OL requirement at base
speed.
The benefit from this can be the possibility to use a size smaller AC drive.
Figure 48. Example: OL(n
base
) < OL(n
max
) for constant power load
0
500
1000
1500
2000
2500
3000
0 200 400 600 800 1000 1200 1400 1600
cont. load
max loa d
Spe e d [r pm ]
Torque [Nm]
13890_UK
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