Marker Synchronisation - Function Diagrams For Marker Synchronisation; Marker Synchronising - Danfoss MCO 350 Operating Instructions Manual

Syncronising Controller MCO 350 Operating
Instructions
As soon as the slave drive is in position synchronisation to the master, a displacement of this
position can be effected by means of Inputs 32 + 33. Offset is related to the master position.
Offset related to the slave position can be calculated as follows:
O ffset
Switching to another gear ratio
During synchronisation, a new gear ratio can be selected at Inputs 9 and 10. The gear ratio is
then activated by means of Input (I2). The slave will then proceed at the permitted acceleration
to this new gear ratio. The offset is related to the first gear ratio after SyncStart. Therefore a stop
and then start must be performed if the offset must relate to the latest gear ratio it the gear ratio
has been changed.
Error procedure
Errors of tracking, over current etc. make the drive stop. The Ready output (O8) is set low. Reset
is done with Input 27 or fieldbus bit 1.9. Reset is also possible with of the [Reset] button on the
local control panel of the drive.
4.8. Marker Synchronisation - Function Diagrams for
Marker Synchronisation

4.8.1. Marker Synchronising

Using Marker synchronising the start position is not predefined. The Marker will alter the position
during operation, as required. Marker synchronising is for example used to compensate for any
undesired slip.
Illustration 4.10: Control behaviour with marker synchronisation
It appears from the diagram that the control accuracy depends on the master acceleration and
on the speed deviation between slave and master.
O ffset x Par
. 19 − 06
slave
_ =
Par
. 19 − 07
In case the drive has stopped because of earth fault or short-circuit, disconnect the
drive from the mains before resetting!
®
MG.33.Q1.02 - VLT is a registered Danfoss trademark
4. Synchronisation
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