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7.2. Initialization
Please connect the device with the wall outlet by using the external power
supply. It must be suitable to the type of amplifier. The power LED ON lights
up after the power supply is switched on. Pay attention to the correct
assignment of modulation signal and monitor signal on the front-panel SMB
sockets, if you use this.
The actuators are driven by voltages up to +150V. Please pay attention to
shock hazard protection.
7.3. Service
The actuator is connected to the amplifier by a LEMO socket. The
potentiometer is used to adjust the level of the output voltage (OFFSET). The
rest position of the actuator is hereby adjusted. An external triggering signal in
the range of 0...+10V (MOD input socket) can control the output voltage.
Utilizing this input high dynamic scanning functions are possible.
To avoid damage to the actuators, it is recommended to adjust the
potentiometer to the maximun counter clockwise position before switching on
the amplifier.
By superposition of the modulating voltage and adjusted offset, voltages up to
160V might occur. This operating state is to be avoided to protect the
ceramics and increase the MTBF. In addition, the OVL-LED lights up in the
case of a limit error. No automatic disconnection of the overvoltage occurs in
that case! To guarantee stable temperature circumstances, we recommend to
switch on the amplifier approx. 2 hours before the measurement in the sub-
µm range takes place . A constant temperature environment is necessary for
precise positioning tasks. Please note, that a temperature change of ΔT = 5K
will cause a 13µm increase in length of a 20cm steel rod.
The special qualities of piezo-ceramics like hysteresis and creep can cause
inaccuracies in the case of nonobservance. These basic qualities of piezo-
elements are described in the "piezoline" tutorial in our catalog. Do not
hesitate to contact our staff, if you need further information.
After switching ON, the red LED indicates “ready to operate”. If the OFFSET
potentiometer is in the max. counter clockwise position, the actuator is in the
rest position. By turning the potentiometer into the max. clockwise position,
the max. motion will be done. The motion depends on the actuator specs,
please refer to the hysteresis data curve for details.
The red OVL-LED indicates overload, the red UDL-LED underload. Please
avoid over- & underload in these cases or switch off the device, if the LED is
still lighten.
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