Lenze I95AE240F User Manual

9.6.2 General mode of operaon
If an event occurs at the congured touch probe source, a me stamp is detected in the servo
in
verter.
The detected me stamp is related to the system me and can thus be divided into two parts:
One part is the control cycle in which the of the event. The other part is the me dierence
starng from the detected control cycle to the real detecon of the event
Thanks to a history buer, the servo inverter knows the last n posion values. Thus, the actual
posion is known at the start and at the end of the control cycle in which the event has occur-
red. A linear interpolaon takes place between these two posion grid points. The result is
the exact posion at the motor sha at the me the event is triggered, see the schemac dia-
gram:
Event received
250 µs
Position
t
t
1
p
n-1
p
n
t
1
: Time dierence
starng from the detected control cycle to the real detecon of the event
P
n-1
: Actual posion grid point 1
P
n
: Actual posion grid point 2
The posion grid points are detected in the servo inverter in a grid of 250 µs. Aer a touch
probe has been triggered, the input is deacvated for up to 250 µs to avoid bouncing. Thus,
the maximum frequency for touch probe triggering is 4 kHz.
If in contrast to the uniform movement given in the gure, an accelerated movement is taken
as a basis, the 250 µs grid also allows for a very good linear posion reconstrucon because
the speed change at the motor sha only has a marginal impact in 250 µs.
9.6.3 Filtering of the touch probe signal
For the touch probe inputs, a common lter me (debounce me) can be parameterised to
debounce the TP signals so that there is no response to external interfering signals.
•
The signal s
tatus of the debouncing lter is detected at the TP input and a new value is
added t
o the lter.
•
A separ
ate seng for a touch probe is not possible. Thus, the lter me is set for all touch
pr
obe inputs.
Parameter
Address Name / seng range / [default seng] Info
0x2500 Touch probe lter
me
0 ... [0] ... 1984 us
The set lter me is automacally taken into account in the touch probe
calculaon.
The seng "0" deacvates the lter.
Note!
Values can be set directly. When entering a lter me between
0 ... 1984 µs, the value is automacally rounded down internally to the
next value that can be set and is shown in the case of read requests.
Congure
posion control
Posion detecon with touch probe (TP)
Filtering of the touch probe signal
142

Lenze I95AE240F Specifications

General

Brand	Lenze
Model	I95AE240F
Category	Inverter
Language	English