Siemens SINAMICS S120 Function Manual page 473

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To ensure the ability for the axis to traverse beyond the hardware limit switches in position-

controlled operation, proceed as follows:

1. Deactivate the corresponding hardware limit switch (minus or plus).

2. Have the axis with position control traverse beyond the hardware limit switch.

If the axis traverses beyond the hardware limit switches in speed-controlled operation, the

following occurs:

1. When the hardware limit switch is initially approached, the converter stops the axis.

2. Depending on which direction the axis is traversing, the converter reports the fault F07491

(EPOS: STOP cams, minus approached) or F07492 (EPOS: STOP cams, plus

approached).

After fault acknowledgment, it is possible for the speed-controlled axis to traverse further in the

same direction over the corresponding hardware limit switch.

If the position actual value resolution is not adequate in the speed-controlled mode, when

returning to the positioning range, the converter cannot identify whether the axis is again within

the positioning range. As a consequence, the converter prevents the axis from being traversed

in the position-controlled mode.

You must select the level-triggered evaluation of the hardware limit switches to guarantee

position-controlled traversing of the axis, even if the position actual value resolution is not

● The hardware limit switch reaches the end of the machine.

1. Open the parameter view in Startdrive.

2. Set p2584.01 = 1.

This setting means you have selected the level-triggered evaluation of the hardware limit

Drive functions

Function Manual, 06/2019, 6SL3097-5AB00-0BP2

Damaging the machine by traveling past a hardware limit switch

Traveling past a hardware limit switch may damage the machine.

● Monitor axis motion, and manually stop the axis in plenty of time, e.g. using an

Emergency Stop.

Function modules

9.8 Basic positioner