Rockwell-automation 20B PowerFlex 70, PowerFlex 700 Reference Manual Manual de usuario descargar pdf (Pagina 128)

PET

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

PET Pulse Elimination Technique – See Reflected Wave on page 149.

Power Loss Some processes or applications cannot tolerate drive output interruptions caused

by momentary power outages. When AC input line power is interrupted to the

drive, user programming can determine the drive’s reaction.

Terms

The following is a definition of terms. Some of these values are drive parameters

and some are not. The description of how these operate is explained below

Table 14 PF70 Bus Levels

Ter m D ef ini tion

Vbus The instantaneous DC bus voltage.

Vmem The average DC bus voltage. A measure of the “nominal” bus voltage determined by heavily filtering bus

voltage. Just after the pre-charge relay is closed during the initial power-up bus pre-charge, bus memory

is set equal to bus voltage. Thereafter it is updated by ramping at a very slow rate toward Vbus. The filtered

value ramps at 2.4V DC per minute (for a 480VAC drive). An increase in Vmem is blocked during

deceleration to prevent a false high value due to the bus being pumped up by regeneration. Any change to

Vmem is blocked during inertia ride through.

Vslew The rate of change of Vmem in volts per minute.

Vrecover The threshold for recovery from power loss.

Vtrigger The threshold to detect power loss.

PowerFlex 700

The level is adjustable. The default is the value in the PF700 Bus Level table. If “Pwr Loss Lvl” is selected as

an input function AND energized, Vtrigger is set to Vmem minus [Power Loss Level].

Vopen is normally 60V DC below Vtrigger (in a 480VAC drive). Both Vopen and Vtrigger are limited to a

minimum of Vmin. This is only a factor if [Power Loss Level] is set to a large value.

PowerFlex 70

This is a fixed value.

WARNING:

When using a value of Parameter #186 [Power Loss Level] larger than default, the customer must provide a

minimum line impedance to limit inrush current when the power line recovers. The input impedance

should be equal or greater than the equivalent of a 5% transformer with a VA rating 5 times the drive’s

input VA rating.

Vinertia The software regulation reference for Vbus during inertia ride through.

Vclose The threshold to close the pre-charge contactor.

Vopen The threshold to open the pre-charge contactor.

Vmin The minimum value of Vopen.

Voff The bus voltage below which the switching power supply falls out of regulation.

Class 200/240 VAC 400/480 VAC 600/690 VAC

Vslew 1.2V DC 2.4V DC 3.0V DC

Vrecover Vmem – 30V Vmem – 60V Vmem – 75V

Vclose Vmem – 60V Vmem – 120V Vmem – 150V

Vtrigger1 Vmem – 60V Vmem – 120V Vmem – 150V

Vtrigger2 Vmem – 90V Vmem – 180V Vmem – 225V

Vopen Vmem – 90V Vmem – 180V Vmem – 225V

Vmin 204V DC 407V DC 509V DC

Voff 3 ? 300V DC ?

1 2 ... 123 124 125 126 127 128 129 130 131 132 133 ... 213 214

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