7 Operation
32
Version: 2.0.0
PZ166E
E-625 Piezo Servo Controller
7.2
Operating Modes
7.2.1
Control Mode
The E-625.CR and the E-625.C0 can be run in analog mode. Alternatively, the E-625.CR can be
run in computer-controlled mode. The active control mode determines the applicable control
sources for the output voltage.
Analog Mode
The piezo voltage depends on the input voltage applied to the
ANALOG IN/WTT
SMB socket.
Depending on the servo mode, the input voltage is interpreted (p. 33) as a direct specification
for the piezo voltage or as a specification for the target position.
The recommended range for the input voltage is –2 to +12 V. The range can be expanded to –3
to +13 V. However, this can reduce (p. 77) the lifetime of the piezo actuator in the positioner
and cause the overflow LED to light up.
The input voltage can also be a computer-generated analog signal (e.g., from a data acquisition
board). You can generate this analog signal with the NI LabVIEW driver from PI that is on the PI
software CD. Note: After installing the driver, it is necessary to activate the analog functionality,
see the file Analog_Readme.txt in the installation directory (C:\ProgramData\PI\LabVIEW).
Computer-Controlled Mode (only E-625.CR)
The E-816 computer interface submodule that is integrated into the E-625.CR controls the
generation of the piezo voltage. The target value (position or piezo voltage, depending on the
servo mode) can be set by commands sent from the PC or from a running macro. Furthermore,
the motion of the positioner can also be triggered by wave table output or a trigger input on
the
ANALOG IN/WTT
SMB socket.
INFORMATION
The E-816 computer interface submodule accepts all commands in analog mode as well as in
computer-controlled mode. The only difference between the two control modes is in the
selection of the control source for the piezo voltage.
INFORMATION
Several devices can be networked together and commanded from one single RS-232 or USB
interface on the PC. E-625.SR or E-665 piezo servo controllers can also be connected to this
network.
Consult the user manual for the E-816 computer interface submodule for additional
information.
The recommended range for the commanded piezo voltage is -20 to +120 V. The range can be
extended to -30 to +130 V. However, this can reduce (p. 77) the lifetime of the piezo actuator in
the positioner and cause the overflow LED to light up.
