Specifications

Altivar
®
31 Adjustable Speed AC Drives
Functions
41
4/2005
© 2004–2005 Schneider Electric All Rights Reserved
PI regulator
This function, suited to pumping and ventilation applications, provides simple
process control using a sensor that sends the drive a feedback signal (such
as flow rate or pressure) for regulating proportional and integral gain.
PI reference
• Internal regulator reference, adjustable from 0 to 100
• Manual reference, selected from any of the possible reference sources
• Two or four preset PI references, adjustable from 0 to 100, requiring the
use of one or two logic inputs respectively
NOTE: The PI reference can also be transmitted via the Modbus RS-485
serial link or the CANopen bus.
PI feedback
PI feedback is assigned using analog input AI1, AI2, or AI3.
Auto/manual
Logic input LI switches the operation to speed reference (Manual) or
PI regulation (Auto).
During operation in automatic mode, the process feedback can be
adapted to correct inverse PI, adjust the proportional and integral gain, or
apply a ramp (time = ACC – DEC) for establishing the PI action on starting
and stopping.
Motor speed is limited to the range from LSP to HSP.
NOTE: The PI function is incompatible with the Preset Speeds and Jog
Operation functions.
Spooling
This function, for winding reels of thread in textile applications, is available
with ATV31••••T drives only.
1
The cam’s rotation speed must follow a precise profile to ensure steady
winding.
continued
1) These drives are available by special order only.
ACC
DEC
RPG
RIG
PIC
X±1
X
FBS
+
HSP
PI
Feed-
back
Manual reference
Reference
Auto
Man
PI inversion
PI regulator
Ramp if PSP = 0
Ramp
Multiplier
Auto/man
ACC: Acceleration
DEC: Deceleration
FBS: PI feedback multiplication coefficient
HSP: High speed
PIC: Reversal of the direction of correction of the PI
regulator
LSP: Low speed
RIG: PI regulator integral gain
RPG: PI regulator proportional gain
PI regulator function
Ramp
LSP
DF531554.ep
Spooling
drive
Winding
drive
Motor
Motor
Cam
Gearbox
Gearbox
Reel of thread
Main
shaft
Thread
guide
Thread
563064.eps
Courtesy of Steven Engineering, Inc.-230 Ryan Way, South San Francisco, CA 94080-6370-Main Office: [phone]-Outside Local Area: [phone]-www.stevenengineering.com