Terumo BCT Trima Accel, Service Manual

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Door System
The centrifuge door assembly allows access inside the centrifuge basin, and the centrifuge door lock
system ensures that the centrifuge door cannot be opened while the centrifuge is spinning.
Latching the centrifuge door closed involves engaging two latch hooks attached to the frame above the
front of the basin that grab onto two latch holes in the latch plate of the centrifuge door. These two latch
hooks have sensors associated with them that indicate whether the door is open or closed. To lock the
door, the solenoid engages the door lock shaft into a hole in the latch plate. This shaft has a sensor that
indicates whether the door is locked or unlocked. When the door latch handle is pressed, it mechanically
levers the latch plate in the door off the latch hooks on the frame, which opens the door. When the door
is locked, the handle does not move when it is pressed.
Figure 2-22: Door lock system block diagram
Prerequisites
The door lock system must meet the following electronic prerequisites for normal operation:
•
24 V DC source from the power supply must be within a 19.2 V DC to 28.8 V DC range
• 24 V DC switched from the motor driver CCA must be within a 19.2 V DC to 28.8 V DC range
• Safety CCA reset of 24 V shutdown (digital) indicates run or no reset (low)
• Safety CCA must activate the 24 V DC switch (digital) on the motor driver CCA
System Description
2-26 Trima Accel
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