Lenze 931W - Manual (Page 68)

Software implementation and parameter setting
Reference menu
Reference type
5
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68 HB 13.0001-EN 3.0
If a negative reference speed is set, and referencing is carried out to a high level of the
”Reference” input, the drive is traversed according to example 3. As the ”Reference” signal
features a low level at starting time, the drive to begin with traverses in the positive
direction until the rising edge is found. At this point the drive reverses its speed and
traverses over the falling edge at negative speed.
In example 4, referencing to a falling edge is carried out at a negative referencing speed.
The drive accelerates innegative directionandtraverses atreference speeduntil thefalling
edge of the ”Edge” signal is identified.
Limit switch, right/left
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Note!
When using 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)
In case of a deviation, a fault with regard to the reference run or to the
operational performance can be assumed. By using the specification of the
”Positive direction” (”System” tab), the orientation of the coordinate system
can be reversed.
By using the correct setting of the ”Positive direction”, the sign of the reference velocity/
speed is automatically defined (example: in case of a ”Positive direction = right”, the velo-
city of the reference run on the left limit switch in principal is negative, whereas the velo-
city on the right limit switch in principal is positive).
The amount of the reference velocity/speed is defined via the ”Speed reference” slide con-
trol. The sign of the setting of the ”Speed reference” slide control furthermore specifies in
which way the limit switch is to be traversed. In general, the following applies to this:
ƒ If the sign of the set ”Reference speed” corresponds to the speed required for the
reference run (e.g. negative reference speed for a referencing to the left limit
switch), the reference is set when the edge of the limit switch is reached, and the
drive is stopped immediately.
ƒ If, on the other hand, the reversed sign is set for the ”Reference speed” slide control
(e.g. positive reference speed for a referencing to the left limit switch), the drive is
stopped when the edge of the limit switch is reached and is accelerated to the
amount of the reference velocity in the opposite direction. In this case the reference
is set as soon the drive moves away again from the limits switch.