Introduction; Function Description; Speed Synchronisation; Position Synchronisation (Angle Synchronisation) - Danfoss MCO 350 Operating Instructions Manual

Syncronising Controller MCO 350 Operating
Instructions

2. Introduction

The synchronising Controller is an application option for VLT Automation Drive FC 301 and 302.
The application option consists of two parts:
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2.2. Function Description

2.2.1. Introduction
The synchronising controller can be used in any application where a drive is to operate synchro-
nously with a master drive. The synchronising controller acts as an electronic shaft. The gear ratio
is freely selectable and can also be changed during operation. The speed or the position is auto-
matically and accurately controlled based on encoder feedback signals from both the master drive
and the slave drives.
For synchronous operation of two or more drives you can use:
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2.2.2. Speed Synchronisation

This is the simplest type of synchronisation. It can be used to compensate for speed differences,
where it is not necessary to compensate for position errors.
The speed synchronisation between master and slave is done at maximum acceleration. To obtain
optimum control the slave drive should therefore be set for a quicker acceleration speed than that
of the master drive.

2.2.3. Position Synchronisation (angle synchronisation)

This is the electronic shaft ensuring a constant angle position ratio between master and slave
drives. In case of a position deviation the slave drive is automatically accelerated to a speed level
that is sufficient for regaining its position to the master drive (I-control like).

2.2.4. Marker Synchronisation

Marker synchronisation is an extended position control. Apart from ensuring a constant angle
position between master and slave drives, marker synchronisation provides the option of using
either an additional sensor or the zero track of the incremental encoder to compensate for any
deviations between master and slave that may occur during operation. Using marker synchroni-
sation the slave is position synchronised until the markers is reached and then the control
compensates for the position difference between master marker and slave marker. This type of
control is used where precision cannot be achieved by using a motor mounted encoder. That could
be because of gearbox slack or other disturbance like belt elongation etc. that are not directly
measurable. Similarly, with marker synchronisation, the slave drive does not need to be brought
into the start position of the master drive at initial start-up, as this is affected automatically by
marker correction.
synchronising controller part
Test Run part
Speed synchronisation
Position synchronisation or
Marker synchronisation
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MG.33.Q1.02 - VLT is a registered Danfoss trademark
2. Introduction
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