Elmomc SimplIQ Digital Servo Drives-Bell Command Referenc Manual de usuario Pagina 293

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The speed controller throws exceptions on excessive speed errors (ER[2]) and on
excessive speed (HL[2], LL[2]).
8.2.2 Speed Controller Parameters
The basic continuous-time PI controller is:
s
sKK
PI
+
where:
K
I
is the integral parameter.
K
P
is the proportional parameter.
When using the scheduler, K
I
and K
P
are functions of time. When not using the gain
scheduler, they are fixed.
The input to the PI element is the speed error e
SPEED
(t) [Internal speed units]:
)()()( tackSpeedFeedbtndSpeedCommate
SPEED
=
The output to the PI element current command I(t) in Ampere units is:
0
() ( ) ()
t
I SPEED P SPEED
I
tKe dKe tττ=⋅ +
The filter has no units and its DC gain is always unity. The filter is described in greater
detail in the chapter on Filters
.
For a non-scheduled case:
K
P
= KP[2]
K
I
= KI[2]
The scheduled case is explained in Section
8.1
The parameters of the non-scheduled speed controller are:
Parameter Description
KP[2] Proportional gain
KI[2] Integral gain
GS[2] Controller gain selection
FF[1] Torque feed forward
CL[1] Continuous torque limit
PL[1] Peak torque limit
KV[N] High-order filter parameters
Table 8-3: Non-scheduled Speed Controller Parameters
SimplIQ for Steppers Application Note The Position and Speed Controller
MAN-STECR (Ver. 1.1)
94
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