Terumo BCT Trima Accel, Service Manual

Page: 66 / 340

Pump Assembly
The five pumps control the flow of inlet blood, anticoagulant, plasma, collected components,
replacement fluid, and return blood. The pumps get their drive commands from the motor driver CCA.
1
Pump motor
2 Optical encoder
3
Drive terminals
4 Hall-effect sensor
Figure 2-3: The pump assembly
Table 2-2: Pump assembly components
Pump Name Function
1 Pump motor The pump motor is a 24 V DC brushed motor that drives the pump
rotor.
2 Optical encoder The optical encoder provides speed feedback by reporting the pump
speed to the control CCA. The encoder is attached directly to the motor
shaft.
3 Drive terminals The drive terminals connect switched 24 V power and ground from the
motor driver CCA to the pump motor.
4 Hall-effect sensor The Hall-effect sensor acts as a redundant speed monitor by reporting
the pump speed to the safety CCA. The sensor is mounted to the pump
raceway.
Pump System
Trima Accel
®
Automated Blood Collection System • Service Manual 2-5