KEB COMBIVERT F5-A Applications Manual page 313

The synchronisation path is set via parameter PS.05 "start offset", making it difficult to realise an offset
-
between master and slave at the start.
- Checking whether the synchronisation was successful is not possible. If the slave drive cannot follow the
calculated ramp (e.g., due to reaching the torque limit), the master position is still set to the slave position.
The angle synchronicity is lost thereby (for the example above, the connection to the position of the switch
"activate synchronous running" would be lost). The switching condition "drive running synchronously" is
also still set in spite of the angle error.
- Even if the slave drive can generally follow, system deviations can distort the accuracy of the angle-
synchronous running.
1
3000
2000
2
1000
0
3
4
5
6
7
1. ru.56: Set position (master position)
2. ru.54: Actual position (slave position)
3. Actual speed master (converted with the gear ratio)
4. Actual speed slave
5. Angle difference > level
6. Drive runs synchronously
7. Activate posi / synrchronous running
© KEB, 2012-10 COMBIVERT F5-A, -E, -H
Posi- and synchronous operating
The master position (set position) is set to 0 at the activation
of the synchronous module.
When the master has completed the path programmed in
PS.05, the master position is set to the slave position.
The slave drive calculates the acceleration / deceleration
PS.05:
ramps it needs to reach the master in this time.
Startoffset
The ramp time also depends on the master speed and the
value in PS.05.
After the master has completed the path programmed in
PS.05, the master position (set position) is overwritten with
the slave position (actual position).
t
7
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