Rockwell Automation 20A PowerFlex 70EC/700VC - Manual (Page 23)

Bus Regulation 19
With bus regulation enabled, the drive can respond to the increasing voltage by
advancing the output frequency until the regeneration is counteracted. This keeps
the bus voltage at a regulated level below the trip point.
The bus voltage regulator takes precedence over acceleration/deceleration. See
Figure 1 .
Bus voltage regulation is selected by the user in the Bus Reg Mode parameter.
Operation
Bus voltage regulation begins when the bus voltage exceeds the bus voltage
regulation set point Vreg and the switches shown in
Figure 1 move to the positions
shown in .
Switch Positions for Bus Regulator Active
SW 1 SW 2 SW 3 SW 4 SW 5
Bus Regulation Limit Bus Reg Open Closed Don’t Care
0V Fault @V
bus
Max
Drive Output Shut Off
Ch1
Ch3
Single Seq 500 S/s
100mV
500mV
Ch2 100mV M 1.00s Ch3 1.47 V
3
2
1
DB Bus
Motor Speed
Output Frequency