Speed Synchronism - Lenze 4800 Manual

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7.3.5

Speed synchronism

Selection
For speed synchronising, select the following slave configurations together with
the master configuration C005 = -5X-:
( Slave for set-value bar C005 = -6X-
( Slave for set-value cascade C005 = -72-
The speed synchronism offset is changed and displayed under C257.
( The code can be accessed via analog terminal, motor potentiometer,
( With this correction value, an offset up to – 3750 rpm can be selected for
The phase controller must be deactivated for speed synchronism (C254 = 0).
Thus, the phase-synchronous running becomes a speed-synchronous running,
i.e. phase errors occur.
7.3.5.1 Speed-synchronous running
Purpose
For material transport with very low stretching coefficients, such as paper, metal,
etc., the tension can be set through the gearbox factor under C032 and C033
because of the oversynchronisation in the ‰ range.
The stretch coefficient of the material results in a certain tension. For better
operation and higher precision in digital frequency coupling, we recommend the
digital frequency cascade C005 = -72-.
7.3.5.2 Speed ratio synchronism
Purpose
( Stretch systems
( Wire drawing systems
Example
Extruder systems with stretching of plastic threads by a speed ratio sychronism,
with the stretching controlled by a motor potentiometer function on-line during the
process (see chapter 15.7).
for only two drives or with fixed speed ratios which have to be set only
once (commissioning).
for more than two drives or simple modification of the speed ratios with
stretch factors in the actual process.
keypad or LECOM.
the fixed speed ratio at the drive.
Configuration
48XX/49XXSHB0399
7-51