
SimplIQ Software Manual The Controller
MAN-SIMSW (Ver. 1.4)
15-4
K
SPEED
is the conversion factor from the D/A scale to current in amperes:
BITSVALUEMC
MC
K
Speed
__
=
, 14000__
BITSVALUEMC
otherwise
countGSdteandsamplesGSforcountsencodernoif
tp
SPEED
]14[
32768
1
]0[
1
0
)(
<
⎩
⎨
⎧
=
∫
For a non-schedule case:
K
P
= KP[2]
K
I
= KI[2]
The scheduled case is explained in section
15.4.
The GS[0] parameter is used to stabilize the motion at very low speeds. It cuts the
proportional gain of the speed controller after enough controller sampling times have
elapsed without a change in the encoder readout.
Example:
For a speed reference of 200 counts/second, a new encoder count is available once per 5
milliseconds, which is about 25 sampling times of the speed controller. If a new encoder
pulse comes only once per 5 milliseconds, the speed readout is delayed by at least 2.5
milliseconds, which in turn may have a fatal effect on the control stability. Setting GS[0]=12,
the proportional gain of the controller is applied only for about half of the time, leading to a
practical reduction of the proportional gain to half at that speed. The reduced gain implies
reduced bandwidth and increased stability. The acceleration from complete rest is slow. To
avoid cutting the speed proportional gain, set GS[0] to its maximum value (refer to the GS
command section in the
SimplIQ Command Reference Manual).
The parameters of the non-scheduled speed controller are:
Parameter Description
KP[2] Proportional gain
KI[2] Integral gain
GS[0] Proportional gain duration
GS[2] Controller gain selection
GS[14] Speed reference integral threshold
FF[1] Torque feed forward
CL[1] Continuous torque limit
PL[1] Peak torque limit
KV[N] High-order filter parameters
Table 15-3: Non-scheduled Speed Controller Parameters
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