Rockwell Automation 20G PowerFlex 750-Series AC Drives - Manual (Page 45)

Rockwell Automation Publication 750-RM002B-EN-P - September 2013 45
Drive Configuration Chapter 1
The bus voltage regulation setpoint is determined from bus memory (a means to
average DC bus over a period of time). The following tables and figure describe
the operation.
Option 0 “Disabled”
If [Bus Reg Mode
n] is set to 0 “Disabled” The Voltage Regulator is off and the
DB transistor is disabled. Energy returning to the DC bus increases the voltage
unchecked and trips the drive on over voltage once the voltage threshold is
reached.
Figure 2 - PowerFlex 750-Series Bus Regulation – Disabled
Voltage Class DC Bus Memory DB On Setpoint DB Off Setpoint
480
<685V DC 750V DC
On - 8V DC
>685V DC Memory + 65V DC
320 360 460 484 528 576
453
509
650
685
750
815
880
DB Turn On
DB Turn Off
AC Volts
DC V
ol
ts
Bu
s R
eg
Cur
ve
#1
Bu
s R
eg
Cur
ve
#2
Bu
s M
em
ory
900
800
700
600
500
400
300
200
100
0
12
10
8
6
4
2
0
-0.2 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6
DC Bus Voltage Speed Feedback
Over Voltage Trip Point
Stop Pressed Motor Coasts
Seconds
DC Bu
s
Vo
lt
s
10
V
olt
s = Base Spee
d