Operating Instructions ACTIVE 06/07102
102 Operating Instructions ACTIVE 06/07
11.5 Search Run
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
Operation Mode 645 = Search Run, the motor speed is synchronized to the cur-
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.
Operation mode 645 Function
0 - Off The synchronization to a rotating drive is deactivated.
1 -
Search direction
acc. to specified
reference value
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).
2 -
First clockwise, then
anti-clockwise,
DCB
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).
3 -
First anti-clockwise,
then clockwise,
DCB
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).
4 - Clockwise only, DCB
Synchronization to the drive is only done in positive direc-
tion (clockwise field of rotation).
5 -
Anti-clockwise only,
DCB
Synchronization to the drive is only done in negative di-
rection (anticlockwise field of rotation).
10 -
Quick Synchroniza-
tion
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).
11 -
Quick Synch. acc. to
Preset Value
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).
14 -
Quick Sync., Clock-
wise Only
Synchronization to the drive is only done in positive direc-
tion (clockwise field of rotation).
15 -
Quick Sync., Anti-
clockwise Only
Synchronization to the drive is only done in negative di-
rection (anticlockwise field of rotation).
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.
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