Optimising The Stalling Behaviour - Lenze 8400 StateLine C Reference Manual

5.4.3.4

Optimising the stalling behaviour

Motor stalling due to a torque overload in the field weakening range is prevented in all
characteristic-based motor control types (VFCplus) by means of an inverter-internal
stalling current monitoring. In the field weakening range, hence at frequencies above the
base frequency, it reduces the maximum current to prevent the motor from stalling. The
reduction depends on the current field frequency, the base frequency, the DC-bus voltage
and the maximum current (C00022). Generally it applies that a higher field frequency
causes a stronger limitation of the maximum current.
The behaviour in the field weakening range can be adapted via the override point of field
weakening (C00080). This parameter serves to shift the frequency-dependent maximum
current characteristic:
C00080

– The maximum current characteristic is shifted by the entered frequency to higher
field frequencies.
– The maximally permissible current and the maximum torque increase in the field
weakening range.
– The risk of motor stalling increases.
C00080

– The maximum current characteristic is shifted by the entered frequency to lower
field frequencies.
– The maximally permissible current and the maximum torque are reduced in the field
weakening range.
– The risk of motor stalling is reduced.

Note!
We recommend to keep the Lenze setting (0 Hz).
Firmware ≤ 11.00 - DMS 8.0 EN - 10/2011
Phone: 800.894.0412 - Fax: 888.723.4773 - Web: www.clrwtr.com - Email: info@clrwtr.com
> 0 Hz:
< 0 Hz:
L
8400 StateLine C | Reference manual
V/f characteristic control (VFCplus)
Motor control (MCTRL)
137