E-Lins E481 Series Especificaciones descargar pdf (Pagina 29)

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).

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E-Lins E481 Series Especificaciones Pagina 29