BONFIGLIOLI Active Cube Applications Manual

5.1.1.3 Determination of the flux direction at startup
If the frequency inverter were started in sensor-less operation, there would be an alignment process
of the PMSM at the impressed starting current, unless further measures are taken. Depending on iner-
tia and attenuation, decreasing torsional vibrations would result from such an alignment process. To
avoid this, the starting current is impressed in exactly the same direction as the flux when the fre-
quency inverter is turned off. The angle is saved permanently to ensure it is not lost when mains
power fails (Parameter
Operation Mode Search Run 645 to “0-Off”).
If it is not guaranteed that the machine has the same orientation during startup as during shutdown,
the flux direction must be identified upon startup (Parameter
Operation Mode Search Run 645 to
“20-Only Fluxdirection identification”). The process will take approx. 35 ms.
If it is not guaranteed that the machine stands still upon startup,
Operation Mode Search Run 645
must be set to “10 …. 15-Quick Synchronisation…”. Here, it must be noted that only torsional fre-
quencies up to approx. 200 Hz can be identified reliably.
Due to the search run (
Operation Mode Search Run 645 to “10 …. 15-Quick Synchronisation…”),
startup of the standing machine will be delayed additionally by approx. 150 ms.
Parameter
Unit
Setting range
Default settings
No.
Identifier
645
Operation Mode Search Run
A
Selection
0 - off
Operation Modes of Parameter 645
0
-
off
The synchronization to a rotating drive mechanism is
deactivated.
10
-
Quick Synchronisation
An attempt is made to synchronize to the drive in
positive direction (clockwise field of rotation) and in
negative direction (anticlockwise field of rotation).
11
-
Quick Synch. acc. to Preset Value
The search direction is defined by the sign of the set
point. If a positive set point (clockwise field of rota-
tion) is entered, the search is in a positive direction
(clockwise field of rotation), with a negative set point,
the search is in a negative direction (anticlockwise
field of rotation).
14
-
Quick Sync., Clockwise Only
Synchronization to the drive is only done in positive
direction (clockwise field of rotation).
15
-
Quick Sync., Anti-clockwise Only
Synchronization to the drive is only done in negative
direction (anticlockwise field of rotation).
20
-
Only Fluxdirection identification
Only the flux direction is identified for a synchronous
motor (Configuration 30 = 806). The drive must be
at a standstill. Synchronization to a turning drive is not
possible.
30
-
Operation above Frequency Limit
Search run is carried out for a synchronous motor
(Configuration 30 = 806). The search is continued
until a torsional frequency is identified which is higher
than the
Frequency Limit 624. If the stator frequency
drops below the frequency limit, the search run is
continued. This Operation Mode can be used for oper-
ation of synchronous motor in torque-controlled
drives. Use in wind turbines is also possible.
11/13 ACU Spindle Applications 29

BONFIGLIOLI Active Cube Specifications

General

Brand	BONFIGLIOLI
Model	Active Cube
Category	Inverter
Language	English