Setting
up Compax3
C3I20T11 / C3I32T11
124
192-120103 N13 C3I20T11 / C3I32T11 December 2010
MN-M 17,18: Limit switch as machine zero
17
1
18
1
1: Logic state of the direction reversal switch
Function Reversal via Stromschwelle
If no direction reversal switches are available, the reversal of direction can also be
performed during the machine zero run via the function “direction reversal via
Stromschwelle”.
The drive drives against the mechanical end stop.
When the adjustable Stromschwelle is reached, the drive is decelerated and
changes the direction of movement.
Caution!
Wrong settings can cause hazard for man and machine.
It is therefore essential to respect the following:
Choose a low machine zero speed.
Set the machine zero acceleration to a high value, so that the drive changes
direction quickly, the value must, however, not be so high that the limit threshold
is already reached by accelerating or decelerating (without mechanical limitation).
The mechanical limitation as well as the load drain must be set so that they can
absorb the resulting kinetic energy.
With a bad feedback signal or high controller gain (fast controller or high inertia or
mass) the machine zero might not be detected.
In this case it is necessary to use the control signal filter (O2100.20) or the
velocity filter (O2100.10).
