User`s manual

CHAPTER 5.0 Functional Overview 5-44
CDS7324 (FORMERLY LSF-0819)
Rev. A INSTALLATION & USER’S MANUAL
For close inspection of torque, the observer predicted current_q-axis_observer, or the actual q-axis feedback,
current_actual
, can be monitored using the GUI’s oscilloscope, as can any of the parameters listed below.
qcomp.pgain
qcomp.igain
1
s
iq
iqd
+
-
vdc
-vdc
vcq
+
+
dcomp.pgain
dcomp.igain
1
s
id
idd
(generally = 0)
+
-
vdc
-vdc
vcd
+
+
Figure 5.11 : d,q current compensator
Gain calibration parameters can be used to back off the current loop gain at high currents to enable the use of
motors with high saturation. The current_loop_foldback_breakpoint
sets the current at which the current loop gain
starts to reduce and current_loop_foldback_minimum
sets the fraction of the gain to be used at maximum current.
The gains are decreased linearly between the current_loop_foldback_breakpoint
and the maximum current.
The current loop d and q axis compensators
gains, and the observer α and β compensators tuning gains are
summarised in the table below.
Field No. Name Type Units Comment
1272 current_loop_d-axis_i-gain f32 Volts/Amp/Tsamp dcomp.igain
1274 current_loop_d-axis_p-gain f32 Volts/Amp dcomp.pgain
1277 current_loop_q-axis_i-gain f32 Volts/Amp/Tsamp qcomp.igain
1279 current_loop_q-axis_p-gain f32 Volts/Amp qcomp.pgain
1288 current_loop_alpha_observer_i-gain f32 Volts/Amp/Tsamp oacomp.igain
1290 current_loop_alpha_observer_p-gain f32 Volts/Amp oacomp.pgai
n
1293 current_loop_beta_observer_i-gain f32 Volts/Amp/Tsamp obcomp.igain
1295 current_loop_beta_observer_p-gain f32 Volts/Amp obcomp.pgai
n
1284 current_loop_foldback_minimum f32 none calkmin
1285 current_loop_foldback_breakpoint f32 Amp calimin
Table 5.31 List of Current Loop Compensator Gains