Lenze 8400 - Page 220

5 Motor control (MCTRL)
5.8 Sensorless control for synchronous motors (SLPSM)
220
Lenze · 8400 HighLine · Reference manual · DMS 12.0 EN · 06/2017 · TD23
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 How to optimise the speed controller setting by means of the ramp response:
1. Run a typical speed profile and record the ramp response of the speed using the data
logger.
• Motor control variables to be recorded:
nSpeedSetValue_a (speed setpoint)
nMotorSpeedAct_a (actual speed value)
2. Evaluate the ramp response:
• Solid line = ramp response (actual speed value)
• Dash line = speed setpoint
3. Change gain Vp in C00070/3
and reset time Tn in C00071/3.
4. Repeat steps 1 ... 3 until the optimum ramp response is reached.
 Note!
For an optimal setting, we recommend to determine the mass inertia (optimal response
to setpoint changes) first.
Optimise response to setpoint changes and determine mass inertia
( 221)
n
t
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Vp < Vp opt. Vp = Vp opt. Vp > Vp opt.
Tn < Tn opt.
Tn = Tn opt.
Tn > Tn opt.