Function library
Speed (speed control)
Setting of motor control
337
EDBCSXS064 EN 4.0
12.27.3.6
Phase controller
The phase controller is required, for instance, to achieve a phase−synchronous operation
and a drift−free standstill.
Parameter setting:
1. Assign SPEED−MCTRL.PosSet (C7451) with a signal source, which provides the phase
difference between set angle and actual angle.
Note!
For the application "Speed and Torque", the phase difference has to be
generated externally (e .g. in a master control) and transferred via bus system.
2. Select a value > 0 at SPEED−MCTRL.PosLim (C7431/12).
3. Set SPEED−MCTRL.PosOn = TRUE (C7431/19) .
4. Set a highest possible proportional gain (V
pn)
of the speed controller in C0070.
In the PLC program, the variable SPEED−MCTRL.NAdapt (C7431/7) serves to change the
proportional gain (V
pn
):
– V
pn
= SPEED−MCTRL.NAdapt [%] x C0070
– If SPEED−MCTRL.NAdapt is not assigned, the following applies: V
pn
= 100 %,
C0070 = C0070
5. Set the gain of the phase controller > 0 via C0254.
Increase C0254 during operation until the drive has the required control mode.
Code
Possible settings
IMPORTANT
No.
Designation
Lenze/
{Appl.}
Selection
C0254 Vp angle CTRL
0.4000
Phase controller gain (V
p
)
337
0.0000
{ 0.0001}
3.9999
Phase controller influence
The output of the angle controller is added to the speed setpoint.
ƒ
When the actual angle is lagging, the drive is accelerated.
ƒ
When the actual angle is leading, the drive is decelerated until the required angular
synchronism has been reached.
The influence of the phase controller consists of:
ƒ
phase difference multiplied by the proportional gain V
p
(C0254).
ƒ
Influence via an analog signal at SPEED−MCTRL.NAdapt (C7431/7).
V
p
= C0254 x SPEED−MCTRL.NAdapt / 16384
ƒ
Limitation of the phase controller output
– The output of the angle controller is limited to the value
±
SPEED−MCTRL.PosLim
(C7431/12).
–
±
SPEED−MCTRL.PosLim limits the maximum speed−up of the drive with great
angular displacements.
