Rockwell-automation 20B PowerFlex 70, PowerFlex 700 Reference Manual Manual do Utilizador descarregar pdf (Página 11)

Rockwell Automation Publication PFLEX-RM001H-EN-P - June 2013 11

Chapter 2

Detailed Drive Operation

This chapter explains PowerFlex drive functions in detail. Explanations are

organized alphabetically by topic. Refer to the Table of Contents for a listing of

topics.

Accel Time [Accel Time 1, 2]

The Accel Time parameters set the rate at which the drive ramps up its output

frequency after a Start command or during an increase in command frequency

(speed change). The rate established is the result of the programmed Accel Time

and the Minimum and Maximum Frequency, as follows:

Two accel times exist to allow the user to change acceleration rates “on the fly” via

PLC command or digital input. The selection is made by programming [Accel

Time 1] & [Accel Time 2] and then using one of the digital inputs ([Digital Inx

Sel]) programmed as “Accel 2” (see Table 9

for further information). However, if

a PLC is used, manipulate the bits of the command word as shown below.

The effectiveness of these bits or digital inputs can be affected by [Accel Mask].

See Masks

on page 113 for more information.

Times are adjustable in 0.1 second increments from 0.0 seconds to 3600.0

seconds.

In its factory default condition, when no accel select inputs are closed and no

accel time bits are “1,” the default acceleration time is Accel Time 1 and the rate is

determined as above.

Maximum Speed

Accel Time

= Accel Rate (Hz./sec.)

011000010111

Accel 1

Accel 2

Decel 1

Decel 2

0000

10 01234567891112131415

1 = Condition True

0 = Condition False

x = Reserved

Bit #

Stop

Start

Jog

Clear Fault

Forward

Reverse

Local Contrl

Mop Inc

Accel 1

Accel 2

Decel 1

Decel 2

Spd Ref ID 0

(1)

Spd Ref ID 1

(1)

Spd Ref ID 2

(1)

MOP Dec

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 213 214

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