Search Run - BONFIGLIOLI Act 201 Operating Instructions Manual

11.5
The synchronization to a rotating drive is necessary in applications which drive the
motor by their behavior or in which the drive is still rotating after a fault switch-off.
Via
rent motor speed without an "Overcurrent" fault message. After this, the motor is
accelerated to the reference speed at the set acceleration. This synchronization func-
tion determines the current rotary frequency of the drive via a search run in operation
modes 1 to 5.
The synchronization in operation modes 10 to 15 is accelerated by short test impulses.
Rotary frequencies of up to 250 Hz are determined within 100 ms to 300 ms. For
higher frequencies, a wrong frequency is determined and the synchronization fails. In
the "Quick synchronization" operation modes, the search run cannot determine
whether an synchronization attempt has failed.
10 -
11 -
14 -
15 -
Operation modes 1, 4 and 5 define a direction of rotation for the search run and avoid
a deviating direction. The search run can accelerate drives by checking the rotary
frequency if the drives have a low moment of inertia and/or a small load moment.
In operation modes 10 to 15, it cannot be ruled out that a wrong direction of rotation
is determined in quick synchronization. For example, a frequency not equal to zero
may be determined although the drive is at a standstill. If there is no overcurrent, the
drive is accelerated accordingly. The direction of rotation is defined in operation
modes 11, 14 and 15.
102
102

Search Run

Operation Mode
645 = Search Run, the motor speed is synchronized to the cur-
Operation mode 645
0 - Off
Search direction
1 - acc. to specified
reference value
First clockwise, then
2 - anti-clockwise,
DCB
First anti-clockwise,
3 - then clockwise,
DCB
4 - Clockwise only, DCB
Anti-clockwise only,
5 -
DCB
Quick Synchroniza-
tion
Quick Synch. acc. to
Preset Value
Quick Sync., Clock-
wise Only
Quick Sync., Anti-
clockwise Only
Operating Instructions ACTIVE
Operating Instructions ACTIVE
The synchronization to a rotating drive is deactivated.
The search direction is defined by the sign in front of the
reference value. If a positive reference value (clockwise
field of rotation) is entered, the search is in a positive
direction (clockwise field of rotation), with a negative
reference value, the search is in a negative direction (an-
ticlockwise field of rotation).
The first attempt is to synchronize to the drive in positive
direction (clockwise field of rotation). If this attempt fails,
it is tried to synchronize to the drive in negative direction
(anticlockwise field of rotation).
The first attempt is to synchronize to the drive in negative
direction (anticlockwise field of rotation). If this attempt
fails, it is tried to synchronize to the drive in positive di-
rection (clockwise field of rotation).
Synchronization to the drive is only done in positive direc-
tion (clockwise field of rotation).
Synchronization to the drive is only done in negative di-
rection (anticlockwise field of rotation).
An attempt is made to synchronize to the drive in positive
direction (clockwise field of rotation) and in negative di-
rection (anticlockwise field of rotation).
The search direction is defined by the sign in front of the
reference value. If a positive reference value (clockwise
field of rotation) is entered, the search is in a positive
direction (clockwise field of rotation), with a negative
reference value, the search is in a negative direction (an-
ticlockwise field of rotation).
Synchronization to the drive is only done in positive direc-
tion (clockwise field of rotation).
Synchronization to the drive is only done in negative di-
rection (anticlockwise field of rotation).
Function
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