ABB ACSM1 - Position;Synchron Control Features; Load Encoder Gear Function

Drive control and features
52
Position/synchron control features
Load encoder gear function
Positioning uses the measured speed and position of the load. The load encoder
gear function calculates the actual load position on the basis of the measured motor
shaft position.
Load encoder gear application examples:
The load encoder gear parameters 60.03 LOAD GEAR MUL and 60.04 LOAD
GEAR DIV are set as follows:
Note: The sign of the programmed gear ratio has to match the sign of the
mechanical gear ratio.
Because the drive speed control uses motor speed, a gear function between position
control (load side) and speed control (motor side) is needed. This gear function is
formed from the motor gear function and inverted load gear function. The gear
function is applied to the position control output (speed reference) as follows:
M
3~
Positioning uses the measured
speed and position of the load. If
no encoder is mounted on the load
side, the load encoder gear func-
tion must be applied in order to cal-
culate the actual load position on
the basis of the measured motor
shaft position.
A second encoder (encoder 2)
mounted on the load side is used
as the source for the actual posi-
tion value. (Note: Inverted gear ra-
tio is considered when the position
control output (speed reference) is
produced).
M
3~
ENCODER 1 LOADGEARMOTOR
=
60.03 LOAD GEAR MUL
60.04 LOAD GEAR DIV
Load speed
Encoder 1/2 speed
=
71.07 GEAR RATIO MUL
71.08 GEAR RATIO DIV
Motor speed
Load speed