Terumo BCT Trima Accel, Руководство по обслуживанию

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Table 2-9: Linear actuator components (continued)
Name Function
4 Optical sensor and sensor flag The two optical sensor assemblies detect when the cassette tray is in
the up and down positions using the sensor flag.
Figure 2-28: Linear actuator block diagram
Cassette plate position optical sensors (feedback) for the linear actuator go through the valve CCA.
Input command is received at the control CCA, which sends this input command to the motor driver
CCA. The motor driver CCA converts and applies the pulse-width modulated drive signal (polarity
equals direction) to the linear actuator motor. The motor is driven until the position sensors (flags on the
linear actuator assembly) detect the final position desired. The optical sensors light power (5 V) comes
from the control CCA but passes through the valve CCA. The optical sensors are always on. The linear
actuator flag interrupts the light to detect position. If the device is turned on and the position reads
“down,” the safety system shuts down all 24 V. If cassette is “down” on startup, this is a bad safety
condition. The safety CCA removes the control CCA’s command if this occurs. When the control CCA
sees zero feedback volts, the drive signals shut off. The fault line is current sense; if the current goes too
high, it shuts off the drive voltage.
System Description
2-38 Trima Accel
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