Ol( Base ) > Ol; N Max ) For Constant Torque Load - Vacon NXP Hardware Manual

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5.2.2 OL(
n
It is possible to set the overload at base speed smaller than the overload at maximum speed, i.e.
n n
OL( ) < OL(
base 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.
1200
1000
max load
800
600
400
200
0
0
5
) > OL( ) for constant torque load
base max
n
).
200 400
Figure 36. Example: OL(n
cont. load
600 800 1000
Spe ed [rpm ]
) > OL(n ) for constant torque load
base max
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Technical information
1200 1400 1600