PI PiezoWalk E-712 - Page 36

User Manual
E712T0010, valid for E-712.N1, E-712.1AM, E-712.1AN, .2AN, .3AN
CMo, BRo, 10/31/2024
Physik Instrumente (PI) SE & Co. KG, Auf der Römerstraße 1, 76228 Karlsruhe, Germany page 36 / 40
Phone +49 721 4846-0, fax +49 721 4846-1019, e-mail info@pi.ws, www.pi.ws
Parameter ID
(hexa-
decimal)
Command
Level
for write
access
Item Type
Concerned
Data
Type
Parameter
Description
Notes
0x07011800 1 PiezoWalk
Channel
FLOAT PiezoWalk Shearing-
To-Clamping Ratio
Used for full-step mode only.
Must be in the range of 0.01 to 0.5
Gives the ratio of the clamping time
(2 * t
c
) to the whole step cycle time t
z
Z
C
t
t
value
⋅
=
2
.
Since the motion of the runner is
interrupted during the clamping phases, a
value higher than 0.5 is not reasonable.
The value of this parameter directly
affects the rising time of the clamping
and shearing voltages. Keep in mind that
this value, the step cy
cle time, the voltage
amplitude and the actuator capacitance
affect the maximum amplifier current.
actuator
C
C
t
UU
I ⋅
−
=
)(
minmax
max
This current limits the velocity of a
PiezoWalk® drive.
0x07011900 1 PiezoWalk
Channel
FLOAT PiezoWalk Min Step
Cycle Time
[s]
Minimum time per step cycle. This value
will be rounded to a multiple of the
sample time.
With the minimum cycle time t
Z_min
and
the step size per cycle (x
cycle
, given by the
PiezoWalk Step Size parameter, ID
0x07011700), the maximum absolute
velocity of a PiezoWalk® drive is given.
(The minimum velocity should be 0 µm/s
of course.)
min_
max
z
cycle
t
x
v =
In open-loop operation, the maximum
velocity can be limited by the PiezoWalk