Rockwell-automation 20B PowerFlex 70, PowerFlex 700 Reference Manual Manual de usuario descargar pdf (Pagina 57)

Bus Regulation

Rockwell Automation Publication PFLEX-RM001H-EN-P - June 2013 57

The bus voltage regulation set point (Vreg) in the drive is fixed for each voltage

class of drive. The bus voltage regulation set points are identical to the internal

dynamic brake regulation set points VDB's.

To avoid over-voltage faults, a bus voltage regulator is incorporated as part of the

acceleration/deceleration control. As the bus voltage begins to approach the bus

voltage regulation point (Vreg), the bus voltage regulator increases the

magnitude of the output frequency and voltage to reduce the bus voltage. The

bus voltage regulator function takes precedence over the other two functions. See

Figure 13

The bus voltage regulator is shown in the lower one-third of Figure 13

. The

inputs to the bus voltage regulator are the bus voltage, the bus voltage regulation

set point Vreg, proportional gain, integral gain, and derivative gain. The gains are

intended to be internal values and not parameters. These will be test points that

are not visible to the user. 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 13

move to the

positions shown in Tabl e 2

Table 2 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

DB Bus

Motor Speed

Output Frequency

1 2 ... 52 53 54 55 56 57 58 59 60 61 62 ... 213 214

Sin comentarios

Rockwell-automation 20B PowerFlex 70, PowerFlex 700 Reference Manual Manual de usuario Pagina 57