Terumo BCT Trima Accel, Руководство по обслуживанию

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Pump System
The pumps control the flow of inlet blood, anticoagulant, plasma, platelets, and return blood.
Each pump has a brushed direct current (DC) gear motor with a permanent magnet design and a built-
in encoder, which generates 20,608 encoder counts per revolution. The motor-gear ratio is 10.062:1.
The number of encoder pulses per revolution is calculated as the gear ratio multiplied by the 512 line
encoder multiplied by 4 samples. The encoder tracks the direction of the motor. The pumps are driven
by the 24 V power supply.
Each pump rotor has a Hall-effect sensor mounted in its raceway housing that acts as a redundant speed
monitor (monitored by the safety computer CCA) independent of the encoder monitor circuit
(monitored by the control computer). If the encoder reading and the Hall-effect sensor reading are
significantly different, the system generates a pump error alarm. The pump rotors have a bottom-
mounted magnet to signal the Hall-effect sensor when movement occurs.
Due to the platelet pump’s unique spring mounting, the platelet pump has two magnets in its rotor,
which differentiates it from other rotors.
All pumps have three quick-disconnect connectors. Two connectors, the power and ground connectors,
attach to the motor through the brush assemblies. The third connector is the encoder harness. Each
pump raceway also has a Hall-effect sensor CCA mounted to it with a quick-disconnect terminal.
Note: The pump motors can be removed without removing or loosening any of the pump raceways. If a pump
raceway is removed or loosened, an alignment tool is necessary to reinstall it.
1
AC pump
2 Inlet pump
3
Return pump
4 Plasma pump
5
Platelet pump
Figure 2-1: Pump locations (front)
System Description
2-2 Trima Accel
®
Automated Blood Collection System • Service Manual