Software implementation and parameter setting – Lenze 931W User Manual

Page 63

Software implementation and parameter setting

Reference menu

Reference type



HB 13.0001-EN

3.0

Reference switch



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”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:

The sign of the reference speed specifies in which direction the reference switch is to

be traversed when referencing is carried out.

The signal level of the reference switch is defined via the setting ”Active low” or

”Active high” on the ”Inputs/outputs” tab.

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).

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