Rockwell Automation 20G PowerFlex 750-Series AC Drives - Manual (Page 50)

50 Rockwell Automation Publication 750-RM002B-EN-P - September 2013
Chapter 1 Drive Configuration
Sensorless Vector (SV) Control
Because the drive is not limiting the regen power the DB is able to dissipate the
power the entire decel time before duty cycle considerations limits the DB
capability.
Table 4 - Bus Regulation Curves
Level/Gains
The following parameters are Level/Gains related to bus regulation.
P374 [Bus Reg Lvl Cfg]
Bus Regulation Level Configuration - Selects the reference used to determine the
bus voltage regulation level for the bus voltage regulator and the reference used
for the dynamic brake.
• “Bus Memory” (0) – References are determined based on P12 [DC Bus
Memory].
• “BusReg Level” (1) – References are determined based on the voltage set in
P375 [Bus Reg Level].
If coordinated operation of the dynamic brakes of a common bus system is
desired, use this selection and set the P375 [Bus Reg Level] to coordinate the
brake operation of the common bus drives.
Voltage Class DC Bus Memory Bus Reg Curve 1 Bus Reg Curve 2
480
< 650V DC Memory + 100V DC
Curve 1 - 8V DC 650V DC
≤ DC Bus Memory ≤ 685V DC
750V DC
> 685V DC Memory + 65V DC
900
800
700
600
500
400
300
200
100
0
14
12
10
8
6
4
2
0
-0.15 0.05 0.25 0.45 0.65 0.85 1.05 1.25 1.45
DC Bus Voltage DC Current
DC Bus
PowerFlex 750-Series Bus Regulation – Both DB First SV
Seconds
DC B
us
V
olt
s
10 V
olt
s = B
ase S
peed
Speed Fdbk
Motor Speed
Brake Current