Rockwell Automation 2364P Parallel DC Bus Supply Config. - Manual (Page 198)

Publication 2364P-5.01 December 1999
16-8 Setting Up the Parallel Configuration
Voltage Loop Bandwidth [P205]
The voltage loop bandwidth determines the dynamic behavior of the voltage loop. The voltage loop
becomes more responsive and is able to track faster as the bandwidth is increased. However, note that
system limitations and excessive noise may adversely affect the performance of the RGU if the bandwidth is
set too high.
If the RGU is supplying a single inverter, a voltage loop bandwidth of 200 rad/s is recommended (300 rad/s
maximum). If the RGU is supplying multiple inverters, the voltage loop bandwidth should be calculated
using the following formula:
Default values for P204 (Internal Capacitance) are given in the following chart.
Set master and slave RGUs with same value.
Example
A 460V AC T5 configuration (catalog number 2364PA-T5AB) is connected to a 1336 FORCE (100HP), 1336
PLUS (150HP), and SA3100 (150HP).
The catalog number (2364PA-T5AB) indicates two 460V AC M-code RGUs are in the configuration. The
internal capacitance for each RGU is 2400 uf/10 (as shown above). The total external capacitance for the
inverters is 3300 uf/10. So P203 will equal 1650 uf/10 for each of the RGUs. Using the formula, we can
determine the appropriate value for the voltage loop bandwidth (P205):.
Voltage Loop Damping [P206]
The Voltage Loop Damping (P206) also determines the dynamic behavior of the voltage loop. This damping
influences the amount of overshoot the voltage loop will exhibit during a transient. Typically, this value
should be set to 100%.
Set master and slave RGUs with same value.
P205 =
200 x P204
P203 + P204
Factory
Default 1200 (380/460V)
600 (575V)
K-code RGUs
Factory
Default 1500
L-code RGUs
Factory
Default 2400
M-code RGUs
Factory
Default 2400
N-code RGUs
2 0 0 r a d / s
B u s V o l t B W
P205 =
200 x 2400
1650 + 2400
= 118 rad/s (Example Only)
1 0 0 %
B u s V o l t D a m p i n g