Terumo BCT Trima Accel, Service Manual

Page: 279 / 340

Door Lock System Measurements
This section indicates where to take measurements in the door lock system, starting with the control
CCA, moving to the motor driver CCA, the door lock assembly, and finally back to the control CCA.
Lock Solenoid Direction and Enable Bits
These bits cannot reasonably be measured in the field. Use STS to select and move the lock
solenoid while using the lock solenoid voltage table (below) to measure the output from the motor
driver CCA. If the solenoid connectors shows proper voltage when commanded, then assume that
the bits are reaching the motor driver CCA.
Solenoid Voltage Pulse
This voltage is a mom24 V DC pulse. A DMM with a min/max feature will assist in
capturing the voltage. If you do not have a DMM with this feature, disconnect the solenoid power
harness. Insert meter probes into the device side of the solenoid power harness. Use STS to select
and move the lock solenoid, and measure the solenoid pulse voltage out of the motor driver CCA.
Table 4-11: Lock solenoid voltage measurement points and values
From (Ground) To (Voltage) Lock Direction Unlock Direction
Black wire Brown wire +24 V DC pulse -24 V DC pulse
Solenoid Coil Resistance
Measure the resistance across the solenoid coil with the harness disconnected.
It should read 12.0 ± 0.1
Ω
.
Solenoid Position Optical Sensor
Measure across the solenoid position sensor connection (Pin 4 and 5) with the harness connected.
The connector may be physically labeled as “Door Locked.” Use STS to select and move the lock
solenoid, and measure the voltage from the solenoid position sensor.
Table 4-12: Lock solenoid position optical sensor voltage measurement points and values
Pin 4 Pin 5 Reports Locked Reports Unlocked
Blue wire Green wire 0 V DC +5 V DC
Door Position Optical Sensor
Measure across the door optical position sensor connection (Pin 4 and 5) with the harness
connected. The connector may be physically labeled as “Door Closed.” Open or close the
centrifuge door and measure the voltage from the optical position sensor.
Troubleshooting
4-18 Trima Accel
®
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