Lenze 931W - Manual (Page 63)

Software implementation and parameter setting
Reference menu
Reference type
5
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63 HB 13.0001-EN 3.0
Reference switch
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Note!
When using reference and limit switches, the correct integration of the limit
switches (see ”Inputs/outputs” tab) as well as the orientation of the right and
left limit switch (ESL, ESR) is to be checked before carrying out the reference
run. In principle, the following applies to a positive direction of movement (for
this, see ”positive direction” setting in the ”System” tab):
”Positive direction” = right: The position value of the left limit switch has to be
smaller than that of the right limit switch (ESL<ESR).
”Positive direction” = left: The position value of the right limit switch has to be
smaller than that of the left limit switch (ESL>ESR)
The position of the reference switch has to be between the limit switches. In
the case of a deviation, a fault with regard to the reference run or to
operational performance can be assumed. By specifying the ”Positive
direction” (”System” tab), the orientation of the coordinate system can be
reversed.
A precondition for the evaluation of the limit switches and the reference
switch is the use of a function module with an increased number of digital
inputs.
For the reference type ”Reference switch”, referencing to a switch which has to be
physically mounted between the two limit switches is carried out. The difference between
a reference switch and an edge is explained in the following paragraph ”Edge”. Basically,
a reference switch is a switch which - only in the geometrically limited active area of the
switch - shows a change in the signal level. In front of and behind the reference switch the
same signal level is to be found (see illustration 4).
In the following, for reasons of simplification, always a linear axis, and therefore a
translatory motion is assumed. For evaluating the reference switch, the function of the
digital input has to be set to ”Reference”. The actual reference run and the home position
to be determined further on depend on the following settings:
ƒ The sign of the reference speed specifies in which direction the reference switch is to
be traversed when referencing is carried out.
ƒ The signal level of the reference switch is defined via the setting ”Active low” or
”Active high” on the ”Inputs/outputs” tab.
ƒ The setting of the absolute resolver position defines whether an evaluation of the
zero pulse of the resolver is to be effected during referencing, or whether
referencing is to be carried out directly to the edge (-1: no evaluation of the zero
pulse of the resolver; 0…4095: evaluation of the zero pulse of the resolver).