Siemens simovert masterdrives Compendium

09.2008 Functions
Siemens AG 6SE7087-6QX70 (Version AK)
SIMOVERT MASTERDRIVES Compendium Motion Control 7-69
3. Set the characteristic to meet requirement "Maximum torque in field
weakening range remains constant":
The output voltage (r003) at the field weakening activation speed
under no load conditions must be measured. The output voltage at
the end point of the desired field weakening range must then be
calculated according to the following formula from the maximum
converter output voltage (depends on converter supply voltage) and
the calculated output voltage at the field weakening activation
speed:
(
)
speed activation weakeningfield nda speed eakeningw
field final between Ratio :range weakeningField
n
n
k
speed activation weakeningfield at voltage OutputU
range weakeningfield of end at oltagev OutputU
)V 540UDCL when(V 350U
where
kUk1UU
Act
End
f
nActOutConv
nEndOutConv
maxConv
2
f
2
nActOutConv
2
f
2
maxConvnEndOutConv
=
=
=
==
⋅+−⋅=
The formula is based on the simplified principle that the voltage drop
across the winding resistance of the motor is negligible in the field
weakening range. This applies to series 1FT6 and 1FK7 servo
motors.
The output voltage calculated by this formula must then be set at the
end speed of the field weakening range at no load via the short-
circuit current. The current setting must be increased in relation to
the automatically calculated value, as the automatic arameterization
run defines the short-circuit current for operation at constant
maximum output.
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
Speed [min-1]
Torque [Nm]
e.g. 1FT6086-8AF71, 27.5 Nm at 2900 rev/min to 4500 rev/min,
U
(no load 2900)
= 296 V, U
(no load 4500)
= 174 V I
k
(P105) = 60 A

Siemens simovert masterdrives Specifications

General

Brand	Siemens
Model	simovert masterdrives
Category	DC Drives
Language	English