Lenze 9400 - Manual (Page 157)

Lenze · Servo-Inverter 9400 HighLine · Reference manual · DMS 10.0 EN · 11/2013 · TD05/06
157
5 Motor interface
5.4 Servo control (SC)
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Optimising the dynamic behaviour in the field weakening range:
4. Adapt the dynamic performance to the behaviour required for the machine application.
5. Repeat the recording of the speed characteristic and record the small signal range in the
field weakening range (n
1
↔ n
2
).
• If the flow setpoint is adapted to the speed too slowly, increase the dynamic
performance of the field weakening controller: reduce the reset time ( C00578 ) in small
steps, the gain ( C00577 ) should remain set to 0 [Vs/V] for most machines.
• If the flow setpoint in the field weakening range falls "too early" with 1/n
2
(stability limit
of the machine reached), the leakage inductance of the motor ( C00085 ) may be reduced
a bit.
• If the actual flow value follows the flow setpoint too slowly, increase the dynamic
performance of the field controller: increase gain ( C00077 ), reduce reset time ( C00078 ).
• If the actual D-current value does not correspond enough to the D-current setpoint, the
dynamic performance of the current controller has to be adapted.  Optimising the
current controller ( 144)
• If the motor speed does not feature the desired characteristic, the speed controller has
to be readjusted with maximum speed in the field weakening range.  Optimising the
speed controller ( 147)
Checking the motor parameters:
6. Carry out dynamic measurement in the range -n
Max
↔ +n
Max
and record the motor speed
using the Oscilloscope .
• The objective is a preferably linear speed characteristic.
• In particular check the ranges around the rated motor speed and speed 0 and, if required,
improve them by adjusting R
R
( C02860 ) or L
H
( C02861 )!