Parker EME
Setting up Compax3
192-120114 N5 C3I22T11 June 2008 221
Searching for the torque maxima (phase 1)
If the sum of the actual and the estimated error angle is ±90° electrically, the motor
torque is maximal for the provided current. If you gradually increase the provided
motor current, the motor will, from a defined value on, surpass its friction torque
and exceed a motion threshold defined by O2190.3:
Illustration of the first phase
t
-180
0
180 °el.
O2190.2
k*O2190.2
M
mot
<- 2)
1)
1)
1): Motion threshold O2190.3
2): Waiting for standstill
O2190.2: Starting current
Latching of the motor (phase 2)
Here, the drive is brought to the position with the provided motor torque=0, where
the angular error is either +-180° or 0°.
Current rise in the second phase.
O2190.1
t
1)
Timp*k1-O2190.1,
max. O2190.1
3)
2)
O2190.1: Rising time of latching current
1) Maximum current from controller or motor
2) Monitoring on 5° electrical movement
3) Monitoring on 60° electrical movement
Motion reduction:
It is possible, to considerably reduce the motor movement occuring during the fine
angle search with the aid of the "motion reduction" parameter (O2190.4).
Please respect also that the acquired commutation result may be slightly worse
than without this measure.
As a current well above the nominal motor current is provided here, there may be
saturation effects on ironcore motors, which might lead to an instable current loop
(-> highly frequent "creaking noises" during the automatic commutation). This can
be avoided by activating the saturation characteristic line in the motor data.
Hint
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