Terumo BCT Trima Accel, Руководство по обслуживанию

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Table 2-6: Centrifuge door and basin components (continued)
Name Function
6 Centrifuge arm
The centrifuge arm holds the rotating centrifuge tubing in place while
the centrifuge spins.
7 Lower bearing holder
The lower bearing holder holds the centrifuge tubing in place at the
lower end of the centrifuge arm.
8 Filler assembly
The filler assembly holds the channel portion of the tubing set in place.
9 Centrifuge loading port
The centrifuge loading port provides an opening in the centrifuge
housing for loading the channel.
Figure 2-18: Centrifuge system block diagram
Starting with an input signal, the control CCA sends a drive command to the centrifuge motor
controller (CMC) after the safety CCA has turned on the 64-volt switch to make centrifuge drive voltage
available to the CMC. The conditions that must be met for the safety CCA to enable the 64-volt switch
include: the door lock solenoid must be unpowered, the door closed sensors must read closed, and the
leak detector must be dry. The control CCA sends a DC voltage (0 V to 5 V) to the CMC as a drive
command. The CMC then converts that voltage into 3-phase drive by superimposing a duty cycle onto
the raw 64-volt-switched voltage on each line, causing the centrifuge motor to spin. Hall-effect sensor
feedback is sent directly to the safety CCA, the control CCA, and the CMC through simple splitting.
The safety and control CCAs have to agree within a certain range of rpm or time, or the centrifuge drive
power is cut. The Hall-effect sensor output is a pulse voltage. If voltage, current, or something in
processing is wrong in the CMC, it sends a fault signal (commutation, direction, or processing) to
Centrifuge System
Trima Accel
®
Automated Blood Collection System • Service Manual 2-21