Emotron VS10 Operation Instructions Manual page 146

Details
The operating range of an asynchronous motor consists of the voltage range
field weakening range. The field weakening range again is divided into two ranges:
• In the first range , the power can be kept constant without the motor stalling.
②
• The second field weakening range
permissible stator current is decreased to prevent the motor from stalling .
Speed/torque curve of the asynchronous motor with two field weakening ranges
The override point (n , M
2
0x2B0C (P319.00) > 0 Hz:
• The maximum current characteristic is shifted to higher field frequencies by the
frequency entered.
• The maximum permissible current and the maximum torque increase in the field
weakening range.
• The risk of motor stalling increases.
0x2B0C (P319.00) < 0 Hz:
• The maximum current characteristic is shifted to lower field frequencies by the
frequency entered.
• The maximum permissible current and the maximum torque are reduced in the field
weakening range.
• The risk of motor stalling is reduced.
Parameter Name / value range / [default setting]
0x2B0C Override field
(P319.00) weakening (Field
weak thold)
-599.0 ... [0.0] ... 599.0 Hz
0x2B01:002 V/f shape data: Base
(P303.02) frequency (V/f shape data:
Base frequency)
Device for 50-Hz mains: 0 ... [50]* ... 1500
Hz Device for 60-Hz mains: 0 ... [60]* ...
1500 Hz
* Default setting depending on the size.
146
is characterised by the fact that the maximum
③
) can be influenced with
2
0x2B0C (P319.00).
Info
Offset of the override point for field weakening.
Base voltage and base frequency define the V/f ratio and thus the gradient
of the V/f characteristic.
• The V/f base voltage is usually set to the rated motor voltage
0x2C01:007 (P320.07).
• The V/f base frequency is usually set to the rated motor frequency
0x2C01:005 (P320.05).
and the
①
01-6203-01R3, CG Drives & Automation