Appendix
47
XtrapulsCD1-pm - User manual
Appendix
1 - SERVO CONTROLLER STRUCTURE
Speed error low-pass filter (Fev)
: defines the cut-off frequency at -3dB of the first order filter which acts on the
current command (Idc). This value is calculated by the amplifier during the auto-tuning procedure and depends on
the selected bandwidth and the selected filter type.
Proportional speed gain (KP2)
: defines the proportional gain of the controller which acts on the speed error. Its
value is calculated by the amplifier during the auto-tuning procedure. It can then be modified by the user if
required.
Integral speed gain (KI)
: defines the integral gain of the controller which acts on the speed error. Its value is
calculated by the amplifier during the auto-tuning procedure. It can then be modified by the user if required.
Damping gain (KC)
: defines the proportional gain of the controller which acts only on the speed feedback. Its
value is calculated by the amplifier during the auto-tuning procedure. It can then be modified by the user if
required.
Proportional position gain(KP1)
: defines the proportional gain of the controller which acts on the position error.
Its value is calculated by the amplifier during the auto-tuning procedure. It can then be modified by the user if
required.
Feedforward speed 1 gain(KF1)
: defines the feedforward speed amplitude corresponding to the speed input
command. This term allows reducing the following error during the motor acceleration and deceleration phases.
Its value is set at 1 after the auto-tuning procedure if a following error as small as possible is required. It can then
be modified by the user if required.
Feedforward speed 2 gain(KF2)
: defines the feedforward speed amplitude corresponding to the viscous
frictions. This term allows reducing the viscous friction effect during the motor acceleration and deceleration
phases. The gain value is equal to the damping gain value + the viscous friction compensation a term. After the
auto-tuning procedure, the feedforward speed 2 gain is set equal to the damping gain value if a following error as
small as possible is required. The viscous friction compensation term can be calculated by measuring the
current/speed ratio at various motor speed values.
Feedforward acceleration gain(KA)
: defines the feedforward acceleration amplitude corresponding to the
acceleration input command. This term allows reducing the following error during the motor acceleration and
deceleration phases. Its value is calculated by the amplifier during the auto-tuning procedure if a following error as
small as possible is required. It can then be modified by the user if required.
+
+
+
+
_
_
+
Position
reference
Speed
Idc
Position
+
_
+
+
KP2
KI
s
KC
2.
.Fev
s+2.
.Fev
KP1
KF1.s
KF2.s
KA.s
2
-
-
-