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Overriding Control

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Function Overview and Split Overriding Control and Reference Generation Automatic Slow Down Strip Positioning (Head and Tail End) Reference Generation for Processing Lines Looper Positioning Main Commissioning Steps HSI example

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Overriding Control


Function Overview and Split

Drive

M-

Overriding Control

Set-points

Accelerationreference

Velocityreference

Commands

Interlockings

Release

& S

R

e.g. BRI

Load ShareControl

Logic

Auxiliary andmain speedreference

Loss

Acceleration torque

+

TorqueLimits

Overriding Control


Function Overview and Split

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Overriding Control


Main function:

Overriding control and interlocking Automatic sequences for threading and unthreading Automatic slow down at pay off reel strip tail end Strip / Weak point tracking and strip positioning Operation mode selection Velocity speed and dv/dt reference generation

Overriding control & Reference generation function

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Overriding Control


Overview Automatic Slow Down

Overriding Control


Automatic Slow Down at pay off reel

Feature:

Automatic slow down to crawl speed/stop at defined remaining strip length

Slow down is a function of the remaining strip length at the pay off reel and the deceleration time of the reference generation function.

Remaining strip length =f (diameter, mandrel

diameter, strip thickness)

Braking distance =f (line speed, crawl speed,

slope, S-time)

Characteristic

Automatic slow down to crawl speed

time

a [m/min/sec]

v [m/min]

Overriding Control


Accuracy in a reversing mill

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Overriding Control


Overview Strip Positioning (Head and Tail End)

Overriding Control


Strip head or tail end positioning

Feature:

Slow down to crawl speed/stop at defined strip head or tail end position

Slow down is a function of the strip position and the deceleration slope

Remaining distance =f (reference position,

actual position)

Braking distance =f (line speed, crawl speed,

slope)

Characteristic

Strip positioning; Slow down

time

V [m/min]

a [m/min/sec]

Overriding Control


Strip head or tail end positioning

Feature:

The function calculates a velocity reference for strip positioning

For complete positioning the function switches from square-root calculation to linear calculation

V = Vsqrt = dS * 2 * a for dS distance x1

V = Vlin = dS * b

for dS <distance x1

Characteristic

Strip positioning; Slow down

time

V [m/min]

V Sqrt [m/min]

V Lin [m/min]

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Overriding Control


Reference Generation for Processing Lines Generation of the

reference value for velocity and dv/dt for the drives at the entry-, process- and exit section by using a S-phase function generator

The function includes: Several velocity values

can be predefined by the user

Internal interlocking of the operation modes

Inputs for signals from automatic slow down and positioning

Inputs for signals from looper positioning

Group jogging operation

Overriding Control


Reference Generation for Processing Lines

Overriding Control


Typical characteristic

Crawl - operation - unthreading - stop

time

a [m/min/sec]

v [m/min]

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Overriding Control


Looper positioning

Feature:

The looper positioning control function takes care of the actual position of the looper and the braking distance.

The function outputs a braking signal for the entry or exit and process reference generation function, so that the looper can reach the reference positions. Also signals for fast stop or emergency stop are created, if the looper reaches defined positions.

Braking distance = f (speed entry or exit, speed process, slope,

S-time, strip cords)

Slow down can be done in two steps:Kind of slow down to "looper crawl" and "looper stop"

Overriding Control


Looper positioningCharacteristic to slow down the entry or exit to process speed:

Characteristic to slow down the process to entry or exit speed:

Overriding Control


Looper positioning

Feature: The looper in positioning control function takes care of a different actual

line velocity speed between process and entry or exit section.The function outputs a velocity reference value for the entry or exit reference generation function to move the looper back into the reference position.

The function takes also care about "Positioning wobbeln”This function is used to protect DC motors in the situation

looper speed equal zero but line speed not equal zero and operation tension released.

The function changes the reference position.First step: Ref. position = Setpoint ± wobbel distanceSecond step: Ref. position = Setpoint (and so on)

Overriding Control


Looper positioningCharacteristic of the entry looper for the different phases (normal positioning, in positioning control, slow down entry, process):

Characteristic of the exit looper for the different phases (normal positioning, in positioning control, slow down exit, process):

Overriding Control


Looper positioningCharacteristic of the exit looper if reference positioning changes to a smaller value:

Characteristic of the entry looper if reference positioning changes to a smaller value:

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Overriding Control


Main Commissioning Steps

1. I/O, bus signals and parameter check.2. Basic drive commissioning (current / DTC control, filed

controller etc.).3. Speed controller uncoupled.4. Speed controller coupled 5. Test jogging forward / backward.6. Measuring and compensation of no load losses.7. Measuring and compensation of inertia.8. Run from overriding control (Rolling operation) without

material to check if all drives follow synchronous.9. Run from overriding control (Rolling operation) with

material.

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Overriding Control


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