Rev A Feb 2020
Page 32
Chapter 4 Standalone Operation
4.6 Using the External Inputs
The EXT IN connector on the rear panel (see Fig. 3.3) can be used to control the
velocity of the piezo actuator by using a voltage input from an external source.
A -10V input gives max velocity in the reverse direction, w10V input gives max
velocity forwards; a 0V input results in no movement.
To use the external inputs, the user should apply a signal of 0V ±0.25 V to the
connector and wait 10 to 12 seconds for the unit to recognize a steady 0V input. After
this time, the drive channel can be controlled by varying the voltage from -10V (max
velocity reverse) to 10 V (max velocity forwards). A 0V input results in no movement.
Note
The external inputs cannot be used in conjunction with the wheel or GUI panels.
If the unit recognizes a 0V signal on the EXT IN connector for around 12 seconds it
will accept this as the controlling input. If subsequently, a move is performed via the
GUI panel or wheel, this will inhibit the analog input. However, if the 0V signal
remains, and no further GUI or wheel moves are performed, the external analog
input will again become active after 12 secs.
To disable completely the analog control, disable the relevant axis, then remove the
analog input, then re-enable the axis.
