E-662 Closed-Loop Piezo Servo Controller and Piezo Amplifier / Driver

  • 36 W Peak Power

  • Position Servo Control

  • For Strain Gages & LVDT Sensors

  • RS-232 Computer Interface with 12-bit D/A Converter

E-662 is a bench-top, closed-loop feedback servo controller with integrated high voltage piezo driver / amplifier.  It also has a digital RS-232 computer interface and 12 bit D/A converter and can operate piezo nanopositioning stages and actuators. The piezo voltage amplifier can output and sink a peak current of 360 mA and an average current of 120 mA. The closed-loop piezo servo controller works with either strain gage sensors (E-662.SR) or LVDT sensors (E-662.LR). E-662 can be operated in 6 ways.

I. Open loop (amplifier / driver mode)

Manual operation

Piezo driver output voltage can be set by a 10-turn, DC offset potentiometer in the range of 0 to 100 V.

External operation

Piezo driver output voltage is controlled by an analog signal applied to the BNC input ranging from -2 to +12 V. Multiplying by the gain factor of 10, an output voltage range of -20 to +120 V results. The DC offset potentiometer allows for a continuous variation of the input voltage range between -2 V to +12 V and -12 V to +2 V.

Computer Control (toggle switch selected)

Piezo driver voltage is controlled via the RS-232 computer interface in the range of 0 to 100 V with a resolution of 12 bits. The DC offset potentiometer and BNC analog input are inactive when in computer control mode.

 

II. Closed loop position feedback servo control mode

Manual operation

Displacement of the piezo nanopositioning stage or piezo mechanism can be set by a 10-turn, DC offset potentiometer in the range of zero to nominal displacement.

External control operation

Displacement of the Piezo stage or mechanism is controlled by an analog signal in the range of 0 to +10 V, applied to the BNC input. The controller is calibrated in such a way that 10 V corresponds with maximum nominal displacement and 0 V corresponds with 0 displacement. The DC offset potentiometer can be used to add an offset voltage of 0 to 10 V to the input signal.

Computer Control (toggle switch selected)

Displacement of the Piezo nanopositioning stage / piezo mechanism is controlled via the RS-232 computer interface in the range of 0 to maximum nominal displacement, with a resolution of 12 bits. The DC offset potentiometer and BNC analog input are inactive when in computer control mode.

More than 40 SCPI (Standard Commands for Programmable Instruments) ASCII commands are available to program the E-662. An internal function generator provides sine, square, ramp and triangular functions up to 150 Hz. User defined functions can be stored in a table with up to 200 entries. Minimum time between two samples is 1 msec. 

ORDERING INFORMATION:
E-662.LR Piezo Amplifier/ Closed-Loop Piezo Servo Controller, LVDT, RS-232 Interface
E-662.SR Piezo Amplifier/ Closed-Loop Piezo Servo Controller, SGS, RS-232 Interface

 

TECHNICAL DATA: E-662

Function

Power amplifier &
sensor/position servo
control of PZTs

Channels

1

Amplifier

 

Maximum output
power

36 W

Average output power

12 W

Peak output current
< 5 ms

360 mA

Average output current
> 5 ms

120 mA

Current limitation

short-circuit proof

Voltage gain

10 ±0.1

Polarity

Positive

Control input voltage

-2 to +12 V

Output voltage

-20 to 120 V

DC offset setting

0 to 100 V
with 10-turn pot.

Input impedance

100 kW

Display

2 x 3 1/2 digit, LED

Control input socket:

BNC

PZT voltage output
socket

LEMO ERA.00.250.CTL

Dimensions

288x235x103 mm

Weight

2.5 kg

Operating voltage

90-120 / 220-240 VAC,
50-60 Hz (linear P/S)

Position Servo Control

Sensor Types

strain gages
(E-662.SR);
LVDTs (E-662.LR)

Servo Characteristics

P-I (analog)
+ notch filter

Sensor socket

LEMO ERA.0S.304.CLL

Sensor monitor
output socket

BNC

D/A Converter & Computer Interface

Resolution

12 bit (=^ 2.5 mV input)

Computer interface

RS-232

 

Related Products and Additional Resources

This is a legacy product that may have limited availability or may have been replaced. Ask a PI engineer for an equivalent new model.

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