value of the actual position and a new "Start Positioning" command is required. If
index positioning is configured, the start index is restarted.
If the positive and negative limit switches are active simultaneously (both supply a
0 signal), always the fault reaction is triggered and an error is output. This should
guarantee the protection of the operated system in case of defective and jammed
limit switches. A reset of the error is possible as soon as the defect at the limit
switch has been remedied and both switches are released again.
If a power-on reset is performed, the parameter settings are retained, but tempo-
rary limit switch data, such as the position when the limit switch is activated or the
hold status, are reset. Therefore the position of the system must be checked before
restarting after a power-on reset.
All reactions to the limit switch, except immediate switch-off, require
that the control (with encoder / ASCL or SCL) is still functional.
In case of a defect of individual power modules, current detection or volt-
age measurement, a wrong system position, the set and actual position
(estimated or measured) can deviate from each other.
➢ Then only switching off the modulation can protect the drive.
maximal forward limit switch
override
Setting the max. difference between the position
when detecting the limit switch signal and the cur-
rent actual position (st33). Value "0" deactivates
the function. The "limit switch active mode“ has no
effect on this function.
maximal reverse limit switch
override
If a "Stop" mode is selected as reaction to the limit switch, a maximum difference
between the position when detecting the limit switch signal and the current actual
position (st33) can be parameterized with hm19/hm20 maximal forward/reverse
limit switchoverride. If this difference is exceeded (e.g. due to a shutdown ramp
that is too slow), the drive switches to "ERROR override forward" or "ERROR over-
ride reverse". This error can only be detected if the modulation is still active. It can
be reset when the modulation is deactivated.
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