Function library
Selection of control mode, optimisation of operating behaviour
7−10
L
EDB82MV752 EN 5.2
7.1.3 Sensorless torque control with speed limitation
Description
The setpoint linked with C0412/6 is interpreted as torque setpoint. Actual values are not required.
The controller varies the speed within the set frequency range in dependence of the load and the
torque selected.
The speed is limited via setpoint 1 or the maximum frequency.
Application with, for instance, winding drives.
) Note!
l The sensorless torque control only operates in motor mode, not in generator
mode.
l The motor parameter identification is absolutely vital! Otherwise commissioning
is not possible.
Codes for parameter setting
Code Possible settings IMPORTANT
No. Name Lenze Selection
C0014
Operating mode 2
2 V/f characteristic control V ~ f
(linear characteristic with constant V
min
boost)
Commissioning is possible without
identifying motor parameters
Advantage of identification with C0148:
– Improved smooth running at low
speeds
– V/f rated frequency (C0015) and slip
(C0021) are calculated and saved.
They must not be entered
7−2
3 V/f characteristic control V ~ f
2
(square−law characteristic with constant V
min
boost)
4 Vector control
In case of the first selection enter the
motor data and identify them with
C0148
Otherwise, commissioning is not
possible
When C0014 = 5, C0019 must be set = 0
(automatic DC injection brake is
deactivated)
5 Sensorless torque control with speed limitation
Torque setpoint via C0412/6
Speed limitation via setpoint 1 (NSET1−N1) if
C0412/1 is assigned, otherwise via maximum
frequency (C0011)
C0047* Torque setpoint or
torque limit value
(MCTRL1−MSET)
400 0 {1 %} 400 The value set will be lost when
switching the mains!
7−10
Ref.: Rated motor torque detected by motor parameter
identification
Control mode "Sensorless torque control"
(C0014 = 5):
Torque setpoint selection if C0412/6 =
FIXED−FREE (not assigned)
Torque setpoint display if C0412/6 is
linked with a signal source
Control mode "V/f characteristic control" or
"Vector control" (C0014 = 2, 3, 4):
Torque limit value is displayed if
C0412/6 is linked with a signal source
C0047 = 400 is displayed if C0412/6 =
FIXED−FREE (not assigned)
C0077* Gain I
max
controller 0.25 0.00
= P component not
active
{0.01} 16.00 7−56
C0078* Integral action time
I
max
controller
65
à 130
12 {1 ms} 9990
= I component not
active
à Only 8200 vector 15 ... 90 kW 7−56
C0087 Rated motor speed à 300 {1 rpm} 16000 à Depending on the controller 7−48
C0088 Rated motor
current
à 0.0 {0.1 A} 650.0 à Depending on the controller
0.0 ... 2.0 x rated output current of the
controller
7−48
C0089 Rated motor
frequency
50 10 {1 Hz} 960 7−48
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