Terumo BCT Trima Accel, Service Manual

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Centrifuge Door-Lock Solenoid
The centrifuge door-lock solenoid ensures that the centrifuge door cannot be opened while the
centrifuge is spinning. It is a bi-directional solenoid: pulsed in one direction, it locks the door; pulsed in
the opposite direction, it unlocks the door. The solenoid moves only when pulsed. To ensure safety,
while the door is locked and the centrifuge is spinning, the safety system disables the 24 V solenoid
power. The centrifuge door-lock solenoid has its own 24 V power switch on the motor driver CCA. The
control system monitors the solenoid position as it attempts to lock the door. It will try five times to lock
the door in two-second increments.
64 V Switch CCA
The 64 V switch CCA enables and disables power to the centrifuge motor controller. The 64 V switch
CCA is controlled by the safety computer.
The 64 V switch is either located on the control CCA or mounted separately on a bracket over the
centrifuge motor controller, depending on the revision of the control CCA. Systems below serial
number 1282 were manufactured with the 64 V switch integrated on the control CCA. An upgrade
spare, including the separate 64 V switch CCA, required bracket, and additional cabling is available to
upgrade this component.
Here are some helpful test point measurements to take:
•
Use test points J1 and J4 to measure the switched 64 V.
• Use test points J1 and J2 to measure the power supply 64 V.
• Use test points J1 and J3 to measure a quick pulse from the over-voltage protection (OVP) signal.
System Description
2-54 Trima Accel
®
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