Specifications

Operation

operation omits the servo loop, and the control input directly controls

the output voltage of the piezo channel. The slew rate can be

influenced by the E-517 (parameter ID 0x07000200).

The servo mode can be set by:

■ The SERVO ON/OFF toggle switches on the piezo control electronics

■ Axis-specific SVO commands sent over the communications

interface or received from a macro running on the E-517

The current servo mode is visible for the individual axes on the main screen

of the E-517 display, see

"Display Screens" (p. 21). Using the SVO?

command, you can check the current servo mode on a per-axis basis.

NOTE

In ONLINE mode the SERVO switches of all channels must be set to

OFF on the piezo control electronics. This gives the E-517 complete

control over the servo mode settings.

Using a start-up macro, you can set up the device to start with

closed-loop operation.

The example below illustrates the interpretation of the control input as piezo

voltage target or target position, depending on the current servo mode. The

E-517 is in OFFLINE mode in this example, and the control input is given by

the DC offset potentiometer. The DC offset potentiometer setting remains

unchanged while switching from open-loop to closed-loop operation, and

the voltages and positions are read out in the display.

Closed-loop operation

(servo ON)

Open-loop operation

(servo OFF)

Output voltage 78.78 V 86.46 V

Position 85.993 µm 92.886 µm

3.3 Power On / Reboot Sequence

CAUTION

Thermally stable systems have the best performance. For a thermally

stable system, power on the E-517 at least one hour before you start

working with it.

Power on the piezo control electronics as described in the corresponding

User Manual(s).