Remedied from:
ECS Motion V1.2
Behaviour of new version?
The detection of the zero pulse or touch probe is not enabled until the drive has left the limit switch. As a result, it is ensured that the home position is always reached.
Which products are affected?
ECSxM V1.1
What happens?
If homing modes 10-13 are selected the drive shall approach the hardware limit switches (positive & negative), reverse there and travel to the next touch probe (modes 10 and 11) or zero pulse (modes 12 and 13).
However, the drive detects the first zero pulse or touch probe (TP) immediately after reversing, even if the limit switch has not been left yet.
This means that the drive does not always stop in the same position because the zero pulse detected depends directly on the homing speed.
When does the problem occur?
Whenever the modes 10-13 are used.
Possible diagnostics?
Compare the homing positions with regard to their reproducibility.
Short-term measures/recommendations?
An option to achieve a similar behaviour like e. g. in mode 12 is to use mode 2.
Regarding this, the positive limit switch (E3) must be connected in parallel with the input for the homing switch (jumper from E3 to E2). Moreover, the preset polarity of input 2 (DI2) in code C0114 subcode 2 must be changed from HIGH active (0) to LOW active (1).
The same procedure applies for mode 13 with input E4 for the negative hardware limit switch.
Evaluation:
The behaviour will already be detected during commissioning and can be eliminated by applying the short-term measures described before.
Published with service message No. 2007/38 und 2007/39
