Altivar 31 - Square D

Altivar ® 31 Adjustable Speed AC Drives
Functions
Acceleration and deceleration ramp profile
This function gradually increases the output frequency, starting from a speed
reference and following either a linear ratio or a preset ratio.
For applications such as material handling, packaging, and transporting
people: Using S ramps takes up mechanical play, eliminates jolts, and
limits non-following of speed during rapid transient operation of high
inertia machines.
For pumping applications (installation with centrifugal pump and nonreturn
valve): Using Uramps controls valve closing more accurately.
Selecting linear, S, U, or customized profiles affects both the acceleration and
deceleration ramps.
S ramps U ramps Customized ramps
f (Hz) f (Hz)
HSP HSP
0 t 0
t
t2
t2
t1
t1
HSP: high speed
t1: ramp time set
t2: 0.6 x t1
The curve coefficient is fixed.
563049
f (Hz)
HSP
0
t1
t2
f (Hz)
HSP
HSP: high speed
t1: ramp time set
t2: 0.5 x t1
The curve coefficient is fixed.
t
0 t
t2
t1
Ramp switching
HSP: high speed
ACC: acceleration ramp 1 time
AC2: acceleration ramp 2 time
dEC: deceleration ramp 1 time
dE2: deceleration ramp 2 time
tA1: adjustable between 0 and 100% (of ACC or AC2)
tA2: adjustable between 0 and (100% – tA1)
(of ACC or AC2)
tA3: adjustable between 0 and 100% (of dEC or dE2)
tA4: adjustable between 0 and (100% – tA3)
(of dEC or dE2)
This function switches two acceleration or deceleration ramp times, which
are separately adjustable. It is enabled by a logic input, a frequency
threshold, or a combination of the two.
Ramp switching is suited to material handling with smooth starting and
approach, and to machines with fast steady-state speed correction.
Forward
or
Reverse
f (Hz)
HSP
1
0
1
4/2005 © 2004–2005 Schneider Electric All Rights Reserved
ACC
AC2
563050
f (Hz)
HSP
LI4 0
Example of switching using logic input LI4
f (Hz)
HSP
0 t 0
tA1 tA2 tA3 tA4
ACC or AC2
dEC or dE2
dE2
dEC
t
t
t
563051
Acceleration 1 (ACC) and
deceleration 1 (dEC):
– adjustment: 0.1 to 999.9 s
– factory setting: 3 s
Acceleration 2 (AC2) and
deceleration 2 (dE2):
– adjustment: 0.1 to 999.9 s
– factory setting: 5 s
HSP: high speed
t
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