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 2.I
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 2-114 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
1
0
0
0
Accel 1
Accel 2
Decel 1
Decel 2
0
1
0
0
0
0
1
0
0
0
0
1
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
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