31
K-Cube Position Aligner
6) Connect the position aligner and the Piezo units to the power supply - see Section
3.3.2.
7) Connect the PSU to the main supply and switch ‘ON’. The version number of the
embedded software is displayed on each Piezo unit during boot up. The software
version is useful when requesting technical support.
4.6.3
Basic Operation
The general procedure involves setting the position aligner to ‘Open Loop’ and using
the manual actuators on the mirror mount to adjust the beam position until the laser
beam is within the detector quadrant sensors. Once this initial position is achieved,
the position aligner is switched to ‘Closed Loop’ and the unit controls the piezo drivers
which move the piezo mirror to focus the beam in the center of the detector.
1) Power up the system. The unit will boot up in OPEN LOOP mode.
2) Adjust the KPZ101 output voltages to mid range (e.g. 37.5 V for a 75 V piezo).
3) Using the manual actuators on the mirror mount, position the laser beam such that
it is directed at the centre of the detector sensor array, and the spot is in the center
of the Target display.
4) Check that the piezo controller connected to the X DIFF connector, is driving the
X-axis piezo actuator. Turn the control knob on the piezo controller to increase the
piezo drive voltage. The laser beam should move along the X axis with very little
Y axis movement. If the beam moves in the Y-a xis, or diagonally, the piezo
controller is connected to the wrong actuator.
5) To ensure corre ct closed loop operation, the Position De mand Sense of the
optical system must be checked. An in correct setting will cause the system to
drive to its limit of travel when switched to closed loop.
When the X-axis piezo voltage is i ncreased, if the spot move to the left, the
Caution
During item (6) ensure the power switch on the front panel of the unit is
turned OFF before connecting to the K-Cube units. DO NOT connect the
K-Cube units to a 'live' power supply. Doing so (i.e. “hot plugging”)
carries the risk of PERMANENT damage to the unit. Similarly, to power
down the unit, turn the power switch OFF before disconnecting the
K-Cube.
