DTI PM-20R Buku Petunjuk - Halaman 7

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5.0 Operation and Control of the Piezomotor

5.1 Connecting the Power Supply

Connect the 12V Power Supply to the Power Supply Connector located on the electronic driver
PCB (Figure 1). Connect the other end of the 12V Power Supply to an appropriate wall power
socket.

5.2 Connecting the Driver Board

The piezomotor connects to the driver board by a connector on the end of the motor wire. This
connector mates with the corresponding connector on the electronic driver PCB. The connectors
can only be joined in one possible orientation. Press the connector gently in place so that it is
flush with the edges of the receptacle on the driver PCB.

5.3 Operation of the Motor and Driver Board

The electronic driver PCB generates the drive signals required by the piezomotor. Motion is created
causing the rotor to rotate. The design enables travel in both directions. Manual control of rotation
is achieved by pushing alternatively the two buttons on the driver board.

5.4 External Control

The driver board can be controlled using an external signal source. Control signals are applied to
Pin 1 or Pin 2 on the External Signal Connector (1,2,3) Fig. 1; depending on the desired direction of
travel. Pin 3 is the common wire. The unused wire must be held at TTL high or be left open. The
control signals applied to Pins 1 or 2 must be TTL compatible. A "high" level (1.8 to 12 Volts) disables
travel, a 'low' level (0 to 0.8 Volts) enables travel.

5.5 Stepping and Continuous Modes

The mode of travel, stepping or continuous, depends on the type of signal applied to the External
Signal Connector (1,2,3) Fig. 1. A constant "low" level (D.C.) signal will result in continuous motion
at maximum speed. A pulse or pulse train will result in stepping operation.
In the stepping mode (PWM mode), the size of each step is determined by the pulse duration, and
the speed of travel is determined by the pulse repetition rate. The minimum pulse duration is around
30 microseconds. The maximum repetition rate F, measured in Hertz, for a selected pulse duration
T, measured in seconds, is determined by the formula F = 1/T.
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