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constant volume algorithm, by General Electric, and used in the Logic+ BSC. By
testing a prototype model to a variety of airflows and filter pressures, the
motor/blower can be “characterized” for that size cabinet. This characterization
allows for the creation of a model-specific motor-blower curve. By programming
the curve values into the motor during assembly, the motor will deliver the
correct volume of air as the HEPA filters load.
Electronics
The Logic+ utilizes two microprocessors. The first is part of the ECM motor,
attached to end of the motor housing, as shown in Figure 1-11. This processor
controls motor operation, and communication with the display board. The second
is located on the control board, located on the right side wall, as shown in Figure
1-12. It controls the display and its interface to the touchpad.
Figure 1-11
The ECM Microprocessor board is encapsulated in
epoxy to prevent moisture and dirt contamination of
the microelectronics.
Figure 1-12
The control board assembly
(located on the right side wall)
The Logic+ has three circuit boards. The ECM microprocessor and power supply
board, located in the end of the ECM, the control board on the right side wall,
shown in Figure 2-5, and the power supply board assembly, located in the
electronics module, as shown in Figure 1-13.
Figure 1-13
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