Lenze I95AE240F User Manual

13.6.5.6 PSM
eld weakening controller
The inverter control enables a synchronous motor to be operated outside the voltage range. If
a motor is selected in the »EASY Starter«, the control is parameterised automacally.
Improve the transion from the base speed range to eld weakening by acvang the current
controller: feedforward control parameter. 40x2941
•
The curr
ent controller precontrol is dened via the following parameters:
•
Mot
or parameter: stator resistance 40x2C01:002
•
Motor parameter: stator leakage inductance 40x2C01:003
•
Motor parameter (PSM): back EMF constant 40x2C03:001
•
If you want to operate a third-party motor in the eld weakening range, you have to deter-
mine the par
ameters previously menoned
Operaon of synchronous motors outside the voltage range:
If pulse inhibit is se
t in the inverter, e.g. in case of an inverter disable or an error,
the DC bus is loaded in accordance with the current speed (see equaon).
• At high speed and outside the voltage range, the terminal voltage can be
higher than the mains voltage!
• In order to prevent the DC bus from being loaded impermissibly high, connect
a brake chopper to the DC bus!
The terminal voltage corresponds to the following equaon
KU = n *
N
M
U
n
V
K
Terminal voltage
n Speed
V
r
ated
Rated mains voltage
n
m
Rated motor voltage
•
Mains sengs: rated mains voltage 40x2540:001
•
Mot
or parameter: rated speed 40x2C01:004
Delaying the buildup of eld weakening
With the default seng (5 %), eld weakening is
iniated, thus ensuring that a punctual
buildup of the eld weakening current shortly before the voltage threshold is reached.
In the case of synchronous motors, seng the Voltage reserve range parameter may bring
about a delayed start of eld weakening for synchronous machines, e.g in order to slightly
reduce the thermal load of the motor. 40x29E4
Conguring the motor control
Opons for opmising the control loops
Mot
or control sengs
247

Lenze I95AE240F Specifications

General

Brand	Lenze
Model	I95AE240F
Category	Inverter
Language	English