6. Optimize the controller by adapting the ratio of the moments of inertia of the load and motor
(p0342):
Initially, the speed actual value follows the speed setpoint with
some delay, and then overshoots the speed setpoint.
• Increase p0342
Initially, the speed actual value increases faster than the speed
setpoint. The setpoint passes the actual value before reaching its
nal value. Finally, the actual value approaches the setpoint with‐
out any overshoot.
• Reduce p0342
7. Switch o the motor.
8. Set p0340 = 4. The converter again calculates the speed controller parameters.
9. Switch on the motor.
10.Over the complete speed range check as to whether the speed control operates satisfactorily
with the optimized settings.
You have optimized the speed controller.
❒
When necessary, set the ramp-up and ramp-down times of the ramp-function generator
(p1120 and p1121) back to the value before optimization.
Mastering critical applications
The drive control can become unstable for drives with a high load moment of inertia and
gearbox backlash or a coupling between the motor and load that can possibly oscillate. In this
case, we recommend the following settings:
• Increase p1452 (smoothing the speed actual value).
• Increase p1472 (integral time T
I
): T
I
≥ 4 · p1452
• If, after these measures, the speed controller does not operate with an adequate dynamic
performance, then increase p1470 (gain K
P
) step-by-step.
Parameters
Table 8-71 Encoderless speed control
Number Name Factory setting
p0342[M] Ratio between the total and motor moments of inertia 1
p1452 Speed controller actual speed value smoothing time (enco‐
derless)
10 ms
p1470[D] Speed controller encoderless operation P gain 0.3
p1472[D] Speed controller encoderless operation integral time 20 ms
p1496[D] Acceleration precontrol scaling 0%
Advanced commissioning
8.19 Motor control
Distributed converter for SIMOGEAR geared motors
Operating Instructions, 10/2020, FW V4.7 SP13, A5E31298649B AL 299
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