Vacon NXP series, Руководство по аппаратному обеспечению системы

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Technical information vacon • 69
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6.2.2 OL( n
base
) > OL( n
max
) for constant torque load
It is possible to set the overload at base speed smaller than the overload at maximum speed, i.e.
OL(
n
base
) < OL( n
max
).
This can be useful when selecting the correct AC drive for constant torque drives where the overload
demand at low speeds is higher than at high speeds.
This possibility is usually used when the field weakening point is higher than base speed.
The benefit from this can be the possibility to use a size smaller AC drive.
Figure 50. Example: OL(n
base
) > OL(n
max
) for constant torque load
0
200
400
600
800
1000
1200
0 200 400 600 800 1000 1200 1400 1600
cont. load
max load
Spe ed [rpm ]
T
o
r
q
u
e
[
N
m
]
13887_UK