Beckman Couler ALLEGRA X-12/R, Service Manual, Page: 57 / 83

Section 4: Schematics
Motor Temperature
Via J11
Motor Temp signal is routed to logic and the data bus through J11.
Sensors
Via J12
Door Latch, Striker Status, and CAN TMP signals are routed to logic and the data bus
through connector J12. Two +24VDC fans are also powered through J12.
Door Latches
J4 & J5
Door Latches are controlled by the microprocessor and the status of the Door Interlock
circuit. Signals are driven by BTS428 High-Side Power Switches.
Compressor and Fans
The Condenser fan J2, Compressor (wiring harness from relay), and the two +24V DC
fans, J12, are controlled by the microprocessor. Signals are driven by BSP550 High-Side
Power Switches.
Rotor ID
Via J8
Index and Code pulses from the Hall Effect Sensor are filtered and connected to the
microprocessors TPU12 and TPU10 channels
Imbalance
Via J9
U36XZY
The imbalance circuit detects drive displacement. A flag, which is a grayscale image
printed on a piece of transparent plastic, is mounted to a bracket that is attached to the
drive. Any movement of the drive displaces the flag, which passes through a photo-
interrupter. The circuit, biased at +2.5VDC, detects and holds the peak signal from the
photo-interrupter. This value is fed to the A/D converter U25 where software determines
if a gross imbalance is present.
Keypad
Via J1
Keypad decoding is achieved with the common Row and Column technique.
Display
Via J3
A vacuum fluorescent display, driven by the microprocessor, displays the instruments
status and run parameters.
4-2 Allegra X-12 Service Manual 7/04