E-831.05 Single-Channel LVPZT Amplifier User Manual PZ235E
1.2.3. Measures during Start-Up and Operation
If the E-831.05 is operated without a case, live parts will be accessible. Touching
the live parts can result in serious injury or death. Electrical, magnetic and
electromagnetic fields emitted by live parts can disturb the E-831.05 and/or the
environment.
Only operate the E-831.05 when it is installed in a shielded case that securely
encloses all live parts and fulfills the requirements of electromagnetic
compatibility.
If a protective earth conductor is not or not properly connected, dangerous touch
voltages can occur and there is a risk of electric shock. In the case of malfunction
or failure of the system, touching the E-831.05 can result in slight injuries.
Only operate the E-831.05 when a protective earth conductor is connected.
Supply voltages that are too high or incorrectly connected can cause damage to
the module. No limiting components are included.
Do not exceed the supply voltage range (see p. 9) for which the E-831.05 is
specified.
Only operate the E-831.05 when the supply voltages are properly connected
(for pin assignment, see p. 10).
1.2.4. Safety Measures during Maintenance
The E-831.05 is maintenance-free.
2. Operating Principle
Low-voltage PZTs can be driven with an extended voltage range of -30 V to
+130 V. This range can be fully covered by the E-831. Piezo actuators are, to a
first approximation, capacitors, which means the current flow depends on the
frequency of operation or, more generally, the slew rate of a changing signal. In
static operation, almost no power will be needed.
E-831 amplifier modules can be used for applications requiring a signal-amplifier.
The operation mode is that of a power amplifier with a fixed gain of 10. This
means for an output voltage swing of -20 to +120 V at the HV-OUT pin, the control
voltage at the CONTROL IN pin has to run from -2 to +12 V. The output is fully
compensated for capacitive loads from 0 μF to 10 µF, which is the typical range of
PI's low-voltage piezo actuators.
E-831.05 small-signal bandwidth is about 15 kHz. The output is subjected to 2
current limits: for short periods it can provide up to 250 mA, but the long-term limit
is 100 mA. This allows to load a capacitor relatively fast but still makes the output
circuit short-circuit-safe without time limitation. In the case temperature exceeds
75°C (can be reached after a few minutes with maximum current), an internal
sensor will shut down the output stage until the temperature is below 65°C.
