ABB ACS 800 Series, Firmware Manual

Page: 101 / 340

Program features
101
Shaft synchro (Only in EXT2 Control)
The Shaft synchro function synchronises the Master and Follower drives when the
drives are in the Master/Follower mode (see section
Master/Follower use of several
drives (Only in EXT2 Control) on page 94 ). However, the synchronisation is in use
only when the drives are set to the speed mode. The function transfers the Master
drive position to the Follower and uses the difference between the positions as the
speed correction factor in the speed control loop of the Follower drive.
Note: The function can only be used if the drive is controlled from location EXT2.
The following figure gives an example of two motors in the Shaft synchro mode.
Follower
‚
+
0
2
0
3
4
5
PID
=
~
Inverter
SPEED
CONTROLLER
TORQUE REFER-
ENCE SELECTOR
TORQUE REFER-
ENCE CONTROL
INVERTER
CONTROL
2.09
TORQUE REF 2
2.10
TORQUE REF 3
SPEED
TORQUE
MIN
MAX
ADD
2.02
ACTUAL SPEED
1
SYNCHRO
CONTROL
02.21 POS ACT PPU
MASTER POSITION
+
0
2
0
3
4
5
PID
=
~
Inverter
SPEED
CONTROLLER
TORQUE REFER-
ENCE SELECTOR
TORQUE REFER-
ENCE CONTROL
INVERTER
CONTROL
2.09
TORQUE REF 2
2.10
TORQUE REF 3
SPEED
TORQUE
MIN
MAX
ADD
2.02
SPEED REF 3
ACTUAL SPEED
1
TO FOLLOWER
TO MASTER
FROM
DRIVE
MASTER
CH2
COMM
MASTER
DRIVE
START/STOP
DIRECTION
COMMAND
SPEED REF
START/STOP
DIRECTION
COMMAND
Master
SPD REF
SHAFT
SCALE
* When Synchro function is not used,
external pointer parameter can be used to
write speed correction to this signal 3.35.
SPEED CORRECTION FACTOR*
97.16 SPD CORR PTR
+.000.000.00
78.03
3.35
10.02, 11.06
23.xx 60.xx
M1 M2
M2
78.xx
INCREMENTAL
ENCODER
2.23
SYNC POS ERROR