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TESTING SPECIFICATIONS
Verification of the device that the upper/lower limit set values of electric conductivity are
reset to normal set values after temperature stat-up test.
Purpose
The detected value of electric conductivity warning of dialysate liquid should be expanded at
stat-up test and reset to normal set value after the test. This specifications are to examine
and verify that "the device shifts to a safe condition if an abnormality occurs".
Methods
1.2.1 CPU4 detects the abnormality of warning defect value setting with the intentionally
suspended special rom of CPU1, which should reset the detected value of electric conductivity
warning of dialyzed liquid to abnormal set value after temperature start-up test.
Expected Results (as designed)
"E098 abnormality of the warning defect value setting" is detected (when the detected
warning defect value expanded at start-up test is maintained for 30 minutes).
The device shifts to the following safe conditions.
Blood pump is stopped.
--- CPU1 changes the voltage of the pin 4 of photocoupler PC19 on blood pump PCB from 0V to
24V.
--- CPU2 changes the voltage of the pin 7 of IC9 on blood pump PCB from 5V to 0V (because
starting command of the pump is turned off).
Venous clamp is closed.
--- CPU1 change the voltage of cathode of diode D28 on master PCB from 24V to 0V.
--- CPU2 changes the voltage of base of transister Q18 on master PCB turned 0.7V to 0V. |