Lenze i510 - Optimising the Stalling Behaviour

7.3.3 Opmising the stalling behaviour
Motor stalling due to torque overload in the eld weakening range in all characterisc-based
motor control types (VFCplus) is prevented by means of an inverter-internal stalling current
monitoring. In the eld weakening rang
e, hence at frequencies above the base frequency, it
reduces the maximum current to prevent the motor from stalling. The reducon depends on
the current eld frequency, the base frequency, the DC-bus voltage, and the maximum cur-
rent. Generally, a higher eld frequency causes a stronger limitaon of the maximum current.
The response in the eld weakening range can be adapted via the override point of eld weak-
ening 0x2B0C (PAR 319).
DANGER!
Danger by incorrect parameterisaon.
Possible consequences: damage t
o material assets and injury to persons
▶
Only change the Lenze seng (0 Hz) in 0x2B0C (PAR 319) aer consulng the motor manu-
facturer!
▶
Recommendaon: maintain Lenze seng (0 Hz).
Details
With the override point of eld weakening 0x2B0C (PAR 319), the frequency-dependen
t maxi-
mum current characterisc can be shied.
Override point of eld weakening > 0 Hz:
•
The maximum current characterisc is shied to higher eld frequencies by the frequency
entered.
•
The maximum permissible current and the maximum torque increase in the eld weakening
range.
•
The risk of motor stalling increases.
Override point of eld weakening < 0 Hz:
•
The maximum current characterisc is shied to lower eld frequencies by the frequency
entered.
•
The maximum permissible current and the maximum torque are reduced in the eld weak-
ening range.
•
The risk of motor stalling is reduced.
Parameter Name / value range / [default seng] Info
0x2B0C
(PAR 319)
Override point of eld weak
ening
(Overr. point of eld weak.)
-599.0 ... [0.0] ... 599.0 Hz
Oset of the override point for eld weakening.
0x2B01:002
(PAR 303/002)
V/f characterisc data: Base frequency
(V/f char. data: Base frequency)
0 ... [50]* ... 599 Hz
•
Default seng depending on the size.
Frequency in the reference point of the V/f characterisc.
•
The V/f base frequency is usually set to the r
ated motor frequency
0x2C01:005 (PAR 320/005).
Motor control
Opmisaon of motor control
Opmising the stalling behaviour
86
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