KEB COMBIVERT F5-A Applications Manual page 352

Posi- and synchronous operating
No reference point setting of the actual position takes place. This has the following con-
sequence: If the position controller is not active (PS.06 = 0), or if the drive cannot follow
the position setpoint due to torque limits or controller settings, errors in the actual
position can add up.
If the referencing marker is recognized only during the deceleration ramp when reaching the target, the target
position cannot be reached with the adjusted ramps anymore.
During the constant running phase, too, the adjustment of the position via the reference markers can lead to
the target position not being reachable anymore. This is possible every time the reference marker shows that
the drive is already nearer the target than expected.
To be able to directly drive to the target in these cases as well, the ramp times must be changed.
In parameter PS.44 "adjustment ramp limit %", a factor between 25 and 100% can be set. 25% means that the
deceleration times may be reduced to maximally 25% and increased by up to a factor of 4. The value 33% in
PS.44 would correspondingly allow a change in the deceleration times of between 33% and a factor of 3 of the
values set in the oP-parameters.
If the adjustment pulse is received when the drive is already in the deceleration phase, adjustment occurs only
during the last S-curve before reaching the target.
If the change of the ramp times by the adjusted correction factor PS.44 is insufficient, the drive enters the status
"position inaccessible".
Page 7.12 - 60 COMBIVERT F5-A, -E, -H
ru.61: target po-
sition
ru.56 Set position
Ref.-marker
Start positioning
© KEB, 2012-10