Lenze E82xVxxxKxxxxx - Manual (Page 266)

Function library
Operating mode
Sensorless torque control with speed limitation
10
l
266 EDS82EV903 EN 3.0
Preparing motor parameter identification
You must enter the motor data of the motor nameplate:
ƒ Rated motor speed (C0087)
ƒ Rated motor current (C0088)
ƒ Rated motor frequency (C0089)
ƒ Rated motor voltage (C0090)
ƒ Motor cos
j (C0091)
Motor parameter identification
Carry out the motor parameter identification. ( ^ 315 )
Automatically detected parameters
V/f−rated frequency (C0015), slip compensation (C0021) and motor stator inductivity
(C0092) are calculated and saved. The total resistance of motor cable and motor is
measured and saved as motor stator resistance (C0084).
Optimise sensorless torque control
After motor parameter identification, the sensorless torque control is generally ready for
operation without the need for further measures. The drive behaviour can be optimised
through the manual adjustment of a few parameters:
Drive behaviour Remedy
Torque is not constant Reduce motor inductance (C0092) by approx. 10 ... 20 %.
No−load current and maximum torque keep decreasing.
Drive does not accelerate from a standstill. Increase the torque setpoint to 20 ... 25 %.
Controller is not able to follow quick load changes Adapt gain (C0077) and reset time (C0078) of the I
max
controller:
l Reduce C0078 = I
max
controller becomes faster
(more dynamic)
l Increase C0078 = I
max
controller becomes slower
("smoother")