Rockwell Automation 2364F Regenerative DC Bus Supply Unit (RGU) - Manual (Page 99)

Publication 2364F-5.01– October 2003
Adjusting Voltage and Current Regulation Parameters 9-7
Processing Bus Data and Making Necessary Error Corrections in the PI
Regulator
The PI (proportional-integral) regulator is responsible for making the
necessary corrections to reduce the error signal (P142). Refer to
Figure 9.6 for the PI regulator firmware diagram. In addition to
having proportional and integral correction capabilities, the PI
regulator also has the added feature of an error limiter.
The error limiter provides additional correction whenever the error
signal exceeds the maximum error signal allowable (P115). The error
limiter is only functional when the error limiter has been turned on
and the RGU is regenerating.
Once the corrected I
q
command has been calculated (P121), the
linearizer can be used to keep the I
q
command fairly constant when
the installation is subject to fluctuations in the AC line and DC bus
voltages.
Figure 9.6
Firmware Diagram for Processing Bus Data and Making Necessary Error
Corrections in the PI Regulator
Bus Fdbk'
Line Voltage'
Linearizer
Error Limiter
142
115 116 117
118
kp/8
Prop. Gain
1 35
ki/8
S
Intg. Gain
119
121 3 35
84
120
+
+
+
Error
Signal
Iq Necessary for
Error Correction
X
X
Y X
X
X
*
Indirect, parameter X
Source; parameter X
Sink; parameter X
Parameter X, bit Y
Battery-backed, parameter X
SYMBOL KEY
Parameter Number Parameter Name
35 bit 1 Host Mode - Error Limiter
35 bit 3 Host Mode - Linearizer
84 Voltage Regulator Output
115 Voltage Loop PI Error Limit
116 Voltage Loop Error Limit Step
117 Voltage Loop Error Gain Limit
118 Voltage Loop Proportional Gain
119 Voltage Loop Integral Gain
120 Voltage Loop Inegrator Output
121 Voltage Loop PI Output
140 Bus Prefiltered Feedback
Parameter Number Parameter Name