Schneider Altivar 28 Manual De Usario página 68

Configurable I/O Application Functions
Analog input application functions
Input AI1 is always the reference.
Assignment of AI2/AIC
Assign C C C C r r r r L L L L and C C C C r r r r H H H H (I/O assignment menu).
Summing speed reference : The frequency reference from AI2/AIC can be summed with AI1
PI regulator : Can be assigned to AI2/AIC. Allows a sensor to be connected and activates the PI regu-
lator
The PI function is programmed via AIC in the I/O menu. The 2 parameters used to configure the PI
function are:
- AIC = PIA configuration of the PI reference at the terminal on AI1. The reference is input AI1 and the
feedback is AI2 or AIC. The PI regulator output becomes the frequency reference.
Application: process control which can be controlled by the motor speed
- AIC = PII configuration of the internal reference rPI which can be adjusted via the keypad (S S S S E E E E t t t t adjust
menu). The feedback is AI2 or AIC
Parameters which can be accessed in the adjust menu S S S S E E E E t t t t :
- regulator proportional gain (rPG)
- regulator integral gain (rIG)
- PI feedback multiplication coefficient (FbS) : is used to adjust the max. value of the feedback so that
it corresponds to the max. value of the PI regulator reference
- reversal of the direction of correction (PIC) : if PIC = no, the motor speed increases when the error is
positive, example: pressure control with a compressor
If PIC = YES, the motor speed decreases when the error is positive, example: temperature control via
a cooling fan.
rPI
or
AI1
AI2
or
AIC
69
(AI2 = 0, +10 V or AIC = X-Y mA, X and Y can be configured from 0 to 20mA)
no
x Fb5
YES
(0,1É100)
PIC
X1
X-1
rIG
rPG
0.01 to 100 0.01 to 100 x 1/S
HSP
Ref.
LSP