Vacon NXP series, System Hardware Manual

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Technical information vacon • 71
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6.2.4 OL( n
base
) > OL( n
max
) for constant power load
Some constant power drives require less overload at max speed than at lower speeds. It is therefore
possible to set the relative overload at base speed higher than the relative overload at maximum
speed, i.e. OL(
n
base
) > OL(
n
max
).
This will decrease the size of the motor when/if thermal loadability is not the dimensioning limit.
Figure 52. Example: OL(n
base
) > OL(n
max
) for constant power load
0
500
1000
1500
2000
2500
3000
3500
0 200 400 600 800 1000 1200 1400 1600
cont. load
max load
Spe ed [rpm ]
T
o
r
q
u
e
[
N
m
]
13889_UK