ABB ACS 800 Series, Firmware Manual

Page: 103 / 340

Program features
103
Defining the basic data for speed correction
Example: If parameter 78.02 SYNCRO GAIN is set to 0.1, the speed correction in
the Follower drive is (0.1 × 78.08 SYNC CORR SCALE) rpm if the position error
between the Master and Follower drive is 1 unit.
Calculating the linear rope speed
The linear rope speed can be calculated as follows.
Example :
If the diameter of rope drum = 1000 mm
Gear ratio = 2.5
Motor rotating at 500 rpm
Then the linear speed = (3.1416 * 1000 * 500) / 2.5 = 628320 mm/min
Defining the basic data for speed reference calculation
Parameter 78.03 SHAFT SCALE defines the position correction factor used in the
speed reference calculation in the Follower drive.
Example: If the Master drive full speed corresponds to a rope speed of 40 000 mm/
min, and the Follower drive full speed corresponds to 30 000 mm/min, parameter
78.03 SHAFT SCALE should be set to value 40 000/30 000 = 1.333. The Follower
multiplies this factor with the speed reference of the Master drive. (Note that there
may be a difference in the gear ratio, which also needs to be considered.)
Parameters 78.05 POS CORR MAX LIMIT and 78.06 POS CORR MIN LIMIT are
used for limiting the speed correction in terms of mm. If the error exceeds or falls
below these parameters (respectively), the speed correction in terms of mm will be
limited to these parameter values.
When the absolute error is greater than the value defined in 78.09 SYNC ERR LIM
for a period longer than 78.07 SYNC ERR FLT DLY, the drive will trip on SYNC
FAULT.
Signal 02.23 SYNC POS ERROR displays the position error of the drive in mm if the
drive is a Follower. Signals 02.24 SYNC POS ERROR 1, 02.25 SYNC POS
ERROR 2, 02.26 SYNC POS ERROR 3 and 02.27 SYNC POS ERROR 4 are the
respective Follower 1, Follower 2, Follower 3 and Follower 4 position errors in mm
that are displayed in the Master drive.
Pi * Diameter of the rope drum (mm) * Motor speed (rpm)
Gear ratio
Linear speed =