Block Diagram; Amplifier With Integrated Feedback Controller - piezosystemjena NV40/3 Bedienungsanleitung

and motion. Each piezo can be controlled separately by turning the voltage offset, by
applying an analog voltage signal of 0 to 10V or by PC interface. The voltage of the monitor
output correspondents to either applied piezo voltage (NV40/3, NV120/1) or completed
motion (NV40/3CLE, NV120/1CLE).
The NV40/3 and NV120/1 are designed for controlling only open loop actuating systems
without any feedback sensor inside. The NV40/3CLE and NV120/1CLE are designed for
piezo actuating system with strain gauge or capacitive feed back sensors inside. In this case,
the sensor signal is prepared by an external pre-amplifier inside the cable. The Automatic
Sensor Identification "ASI" enables the customer to use the amplifier NV40/3CLE or
NV120/1CLE with different piezo actuators of the same product series. This enables the
controller unit to read all system information from the actuating systems which are stored
inside the connector and transmit this information to the amplifier unit.
The chart 7.3.1 shows the block diagram of the NV120/1CLE. With exception of the display
and the processor, the circuit is triplicate for the NV40/3CLE series. The series NV40/3 and
NV120/1 don't have a PID-Controller, an ADC for measurement signals and the switch for
the monitor signal.

7.3.1 block diagram

7.3.2 amplifier with integrated feedback controller

Analog actuating systems with integrated feedback sensors are calibrated with a particular
amplifier unit. Only systems consisting of piezo and amplifier which are calibrated to each
other can be used together to reach the full accuracy performance. Exchanging of actuating
system is possible in this case only if the actuating system is from the same product group.
Otherwise the closed loop controller can be damaged!
Example: If the amplifier NV40/3CLE is calibrated for a 3-axis system MIPOS100SG (range
of motion 100µm), then it can be used with different MIPOS100SG actuators, but not with
MIPOS250SG (range of motion 250µm) or a MIPOS100CAP (different measuring system).
Different actuators have different resonant frequencies and the PID controller have other
calibrations. If an actuator is connected to a channel of the amplifier NV40/3CLE which it was
not calibrated with, it won't be possible using in closed loop.
Please note that the information about the operation mode (closed loop, open loop) are
automatically stored if the system is switched off. When it is switched on again, the last
operation mode is set again. The system starts automatically at the zero position.
Geschäftsführer: Dr. Bernt Götz • Telefon 03641/66880 • Fax 03641/668866 • www.piezosystem.com
block diagram NV120/1CLE, NV40/3CLE
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