Schneider Electric ALTIVAR 58 TRX - Manual (Page 58)

Altivar ® 58 TRX AC Drives
Assignment of Analog Inputs (AIx)
© 2000–2003 Schneider Electric All Rights Reserved
58
09/2003
The following figure shows a diagram of the PI Regulator inputs, calculation points, and outputs.
The following table provides a description of the inputs to the PI Regulator.
Input Range Description
PI setpoint
The setpoint to the PI regulator can be provided from one of three sources:
— via analog input, AI1 (AI2 and AI3 can be set to sum with AI1)
— via preset setpoints defined by logic inputs (see Preset setpoints in this table)
— over a communication network
PI feedback
The feedback to the PI regulator can be provided from AI2 (0–20 mA signal) or AI3 (0–10 Vdc
voltage signal).
Auto / Manual with
manual speed Input
When the PI regulator is configured and a logic input is configured for Auto / Manual, AI3 is the
speed input in manual mode. The PI regulator function is active in Auto mode. When the logic
input is open, (set to state 0), Manual mode is active and the PI regulator is active.
Auto mode is active when the logic input is closed, (set to state 1). In manual mode AI3 is
enabled and the drive controller responds proportionally to the speed reference at AI3.
Preset setpoints
0–100% of
process
maximum
Logic inputs can also be used to provide programmable setpoints. Two or four preset setpoints
require the use of one or two logic inputs respectively.
PI Inversion Yes/No
PI inversion permits an inverted, or reverse-acting , response to the PI setpoint signal. If PIC =
No, the motor speed increases when the error is positive. If PIC = Yes, the motor speed
decreases when the error is positive.
PI proportional gain 0.01–100 PI regulator proportional gain adjusts the scaling of the PI setpoint signal.
PI integral gain 0.01–100 s PI regulator integral gain adjustment.
Time-constant
feedback filter
0–10 s
PSP can be used to dampen the feedback signal. If PSP is set to zero, the ACC and dEC ramps
are active. If PSP is > 0, the AC2/dE2 ramps are active. Adjustment of AC2/dE2 can be used to
refine the response of the PI loop. The dEC ramp is used on stopping.
PI feedback scaling 1.0–100
PI feedback scaling allows adjustment of the maximum value of the PI feedback signal so that
it corresponds to the maximum value of the PI regulator speed reference.
PI setpoint input AI1
or via a configured
setpoint
rPG
rIG
X
PI
feedback
Time constant filter
AC2
dE2
Run
command
ACC
dEC
Manual speed regulation input AI3 (PIM)
ACC
dEC
Auto
Man
Reference
Ramp
if PSP = 0 PI
inversion
Ramp
+
–
PSP FBS
10
Multiplier
PI regulator
Ramp
if PSP > 0
PIC
X ±
1
PI Auto/man selection by Logic Input (PAU)
Input AI2
2 preset setpoints 4 preset setpoints
LIx Reference LIy LIx Reference
0
1 Analog reference
Process max. (HSP) 0
0
1
1 0
1
0
1 Analog reference
PI2 (adjustable)
PI3 (adjustable)
Process max. (HSP)