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HA0378T Rev C Feb 2019
Chapter 5
Travel
- the range of travel (in µm) of the piezo actuator.
Zero
-
Not used on the LPS710 stage
.
Enable
- enables or disables the HV channel's output voltage. With the piezo
enabled, the LED in the button is lit. When disabled, the LED is unlit, the output
voltage on the HV amp channel is set to zero volts and the piezo is disconnected from
the HV amplifier.
Digital display
- shows the voltage applied to the piezo, or the position (in microns),
as determined by the feedback signal (if equipped). The display mode is set via the
'Volts' and 'Position buttons.
Volts and Position
- push button controls used to toggle the display between volts and
position modes - see Section 4.3.. The corresponding button LED is lit when selected.
Open Loop and Closed Loop
- push button control used to toggle between open
loop and closed loop modes. The corresponding button LED is lit when selected.
Settings display
- shows the following user specified settings:
Jog Step Size
- the distance to move when a jog command is initiated. If in closed
loop mode, the step size is measured in microns; if in open loop mode, the step
size is measured in Volts. The step size can be set either via the Settings panel or
by calling the SetJogStepSize method.
Input Source
- displays the input source associated with the selected channel. The
input source can be set either via the 'Settings' panel or by calling the
SetPPCIOSettings method - see Section 5.2.1.
Monitor
- the EXT OUT BNC connector on the rear panel can be used to monitor
the piezo actuator on an external device, e.g. oscilloscope. This parameter shows
the signal being monitored, Drive Voltage, Unprocessed Position or Linearised
Position.
Monitor Bandwidth
- A low pass filter can be switched on to limit the output
bandwidth to the range of interest in most closed loop applications, i.e. 200Hz, see
Feedback Source
- the type of feedback associated with the actuator being driven,
either Capacitive or Strain Gauge.
Settings button
- Displays the 'Settings' panel, which allows the tuning parameters
to be entered - see Section 5.2.
Ident
- when this button is pressed, the main digital display on the unit associated with
the GUI panel will flash for a short period.
Active
- lit when the unit is operating normally and no error condition exists.
Error
- lit when one of the following fault condition occurs:
1) One or more power supply voltages are out of range.
2) Closed loop mode is selected but the associated piezo is disconnected.
3) An overtemp condition has occurred - see Section 4.8.