Rockwell-automation 20C PowerFlex 700H Drives Programming Manual de usuario descargar pdf (Pagina 92)

92 Rockwell Automation Publication 20C-PM001F-EN-P - March 2012

Appendix B Application Notes

• [DC Bus Voltage] – displays the instantaneous value.

• [DC Bus Memory] – displays an estimate of the full-load DC bus voltage.

All drive reactions to power loss are based on either a fixed percentage of [DC

Bus Memory], a fixed DC bus voltage, or a user-programmable DC bus voltage.

The selected power loss mode determines which trigger levels are available, and

the choice of voltage levels is made by “toggling” a digital input programmed to

“Pwr Loss Lvl.”

If “Continue” is selected, the drive will ignore a loss of DC bus voltage and

continue to run the motor until the drive trips on an Undervoltage Fault (F004).

If “Decel” is selected, there is a choice of two levels for recognizing a power loss. If

a digital input is programmed for “Pwr Loss Lvl” but is not energized, or no input

is programmed, the drive will recognize a power loss at 80% of [DC Bus

Memory]. If a digital input is programmed for “Pwr Loss Lvl” and the input is

energized, a power loss will be recognized at the value of [Power Loss Volts].

If “Coast” is selected, there is a choice of two levels for recognizing a power loss. If

a digital input is programmed for “Pwr Loss Lvl” but is not energized, or no input

is programmed, the drive will recognize a power loss at 73% of [DC Bus

Memory]. If a digital input is programmed for “Power Loss Lvl” and the input is

energized, a power loss will be recognized at the value of [Power Loss Volts].

Figure 4 - Power Loss Mode = Coast

Figure 5 - Power Loss Mode = Decel

Nominal

73%

Bus Voltage

Motor Speed

Output Enable

Power Loss

Nominal

80%

Bus Voltage

Motor Speed

Output Enable

Power Loss

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Rockwell-automation 20C PowerFlex 700H Drives Programming Manual de usuario Pagina 92