Beckman Couler ALLEGRA X-12/R, Руководство по обслуживанию, Страница: 40 / 83

Section 3: Service Procedures
Warning: Unplug the centrifuge or turn off and lock out the main wall circuit
breaker before removing an instrument panel.
Warning: As long as the yellow LED on the Motor driver board is lit, the Bus
Voltage is still present. Wait until LED is off.
3.1.9 Imbalance Calibration Allegra X-15R
Note:
To reenter calibration value after clearing S1, S2, S7 diagnostics use ENTER 616.
A calibration is necessary when changing the optical flag, optical sensor, motor or motor
mounts.
Sensor Calibration
A. Turn Instrument Power off.
B. Remove four screws and open front panel.
C. Locate the optical flag and move it out of the light path of the optical sensor, or a
second method would be to loosen the two screws that hold the sensor bracket in place
and pull the sensor bracket all the way to the front of the instrument.
D. Make sure the light path of the optical sensor is clear of any object during calibration.
E. Close front panel.
F. Turn instrument power back on.
G. Use sequence ENTER 615 to calibrate the sensor.
H. The calibration value can be displayed by pressing ENTER 614.
Note:
An SX4750 rotor needs to be installed before adjusting the voltage below.
Before proceedings with adjustments make sure the flag is free of scratches.
Flag Calibration
A. Open the front panel.
B.
Ensure the optical flag is in position within the optical sensor.
C. Connect a DVM between TP 19 and TP 30.
D Loosen two screws and move the sensor bracket all the way toward the drive to read < 1.5 VDC.
E Pull the bracket very slowly towards the front of the instrument until a reading of
2.5 +/- 0.1 Volts DC is established. The sensor should be positioned in the middle of the flag. If
the bracket is pulled to far a second 2.5 V is measurable and the sensor is positioned at the edge
of the flag which is incorrect and will cause I6 diagnostics.
F. Push the rotor to the 12’o clock position and release it.
G. After the rotor moved back to its center position check for 2.5 Volts DC again and
adjust bracket if necessary.
H.. Pull the rotor to the 6 o’clock position and release it.
I. After the rotor moved back to its center position check for 2.5 Volts DC again and
adjust bracket if necessary.
Allegra X-12/R, X-15R Service Manual 07/07 3-7