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Functions (continued)

Altivar

variable speed drives

PID regulator

Usedforsimplecontrolofaowrateorapressurewithasensorwhichsuppliesa

feedback signal adapted to the drive.

This function is suitable for pump and fan applications.

v PID reference

Regulation reference selected from all the possible types:

Internal reference, representing 0 to 100% of the reference signal. This signal -

depends on the machine process.

2or4presetPIDreferences,adjustablefrom0to100%ofthemaximum -

frequency. This signal depends on the machine process. These references require

the use of 1 or 2 logic inputs respectively.

Manual reference, given by the navigation button. -

v PID feedback

Analog input AI1 -

v Auto/Man.

Logic input LI for switching operation to speed reference (Man.) or PID regulation -

(Auto)

During operation in automatic mode, it is possible to adapt the process feedback,

tocorrectinversePIDandtoadjusttheproportionalandintegralgains.

The motor speed is limited to between LSP and HSP.

Conguration of the logic input level

Activates the function assigned to the logic input, whether at high logic level or low

logic level, if permitted by the safety rules.

Example: Ramp switching is assigned to logic input LI2; this function is active if LI2

changestohighorlowlogicleveldependingontheconguration.

I/O monitoring

Shows the logic state of inputs LI1, LI2, LI3 and LI4 and outputs LO+ and R1 on the

4-digit display.

Operating direction: forward/reverse

2-wire control: Forward operation is always assigned to logic input LI1. Reverse

operation can be assigned to logic input LI2, LI3 or LI4.

3-wire control: Stop is always assigned to logic input LI1 and forward operation is

always assigned to logic input LI2. Reverse operation can be assigned to either logic

input LI3 or LI4.

2-wire control

Controls the direction of operation by means of a stay-put contact (permanent

contact, stable logic level 0 or 1, switch).

Run (forward or reverse) and stop commands are controlled by the same logic input.

Enabled by means of 1 or 2 logic inputs (non-reversing or reversing).

See page 22 for the connection diagram.

Three operating modes are possible:

v Detection of the state of the logic inputs

v Detection of a change in state of the logic inputs

v Detection of the state of the logic inputs with forward operation always having

priority over reverse

3-wire control

Controls the operating direction and stopping by means of pulsed contacts

(pushbutton-operated temporary contact).

Run (forward or reverse) and stop commands are controlled by 2 different logic inputs.

Enabled by means of 2 or 3 logic inputs (non-reversing or reversing).

See page 22 for the connection diagram.

Acceleration and deceleration ramp times

Thisfunctionisusedtodeneaccelerationanddecelerationramptimesaccordingto

the application and the machine dynamics. Each ramp time can be set separately

between0.1and999.9s.Factory-setconguration:3s.

Introduction:

page 8

Specications:

page 10

References:

page 14

Dimensions:

page 18

Connections:

page 22

PID regulator

FBS:PIDfeedbackmultiplicationcoefcient

HSP: High speed

PIC: Change of direction of PID regulator correction

LSP: Low speed

RIG: PID regulator integral gain

RPG: PID regulator proportional gain

RPG

RIG

PIC

X±1

FBS

PID

reference

PID

feedback

Manual setpoint

Reference

Auto

Man.

PID reversal

PID regulator

Speed

ramp

Multiplier

Auto/man.

HSP

LSP

PID ramp

Courtesy of Steven Engineering, Inc.-230 Ryan Way, South San Francisco, CA 94080-6370-Main Office: (650) 588-9200-Outside Local Area: (800) 258-9200-www.stevenengineering.com

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