Labconco PURICARE Procedure Station Models 34812xx - Manual (Page 34)

Page 34 of 197
destroy a PSC motor. Given enough microprocessor memory and power, the
manufacturer can program in any number of user-selected programs controlling motor
speed, power and even direction of rotation. The ultimate expression of the power of
the ECM was the development of the 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 2-4. 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 2-5. It controls the
display and its interface to the touchpad.
Figure 2-4
The ECM Microprocessor board being encapsulated in epoxy to
prevent moisture and dirt contamination of the
microelectronics.
Figure 2-5
The control board assembly
(located on the right side wall)