Functions 09.2008
6SE7087-6QX70 (Version AK) Siemens AG
7-68 Compendium Motion Control SIMOVERT MASTERDRIVES
2. Set the characteristic to meet requirement "Maximum output in field
weakening range remains constant":
The output voltage of the converter r003 under no-load conditions at
the field weakening activation speed is recorded. With field
weakening operation selected (P300 = 1), the motor must be made
to approach the end value of the desired field weakening range. The
output voltage at no load must be the same as the voltage at the
field weakening activation speed. The voltage in the field weakening
range can be varied by means of the short-circuit current (P105).
The voltage drops as the short-circuit current increases and vice
versa. The short-circuit current programmed by the automatic
parameterization run corresponds to the application illustrated here
which means that only minor adjustments are required.
1FT6086 - 8AF71
Field
weakening
activation point
0
10
20
30
40
50
60
70
80
90
100
0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000
Speed [min-1]
Torque [Nm]
e.g. 1FT6086-8AF71, 27.5 Nm at 2900 rev/min, 13.3 Nm at
6000 rev/min, U
(no load 2900 to 6000)
= 296 V, I
k
(P105) = 37 A
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