QAL Medical 480, Service And Technical Manual

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12 ERROR CODES
12.1 Error Codes (480/480E)
Important:
Errors are handled on a case by case basis. Detection of some errors stops the CPM. At that time
it will display an error code. It then burns the associated error code into the EE-ERROR byte in EEPROM. For
other lesser errors the only action taken is to burn the code into EEPROM. The specific actions of each error are
detailed in the following text. The EE-ERROR byte is reset by getting into the calibration mode. Refer to section
10.0 for further instructions.
[E1]: KNEE PIVOT ANGLE CALIBRATION ERROR
Error Action: This error prevents the CPM from entering the run mode.
Display: CALIBRATE [E1]
Cause: An invalid knee pivot angle calibration is indicated by bit 0 of EE_CAL_STATUS being zero.
Corrective Action: Re-calibrate the unit.
[E2]: MECHANICAL LIMIT CHECK OR FORCE CHECK VALIDATION ERROR
Error Action: See Display
Display: CALIBRATE [<-]
Cause: The extension limit check, the flexion limit check of the force check was not fully executed. This
action occurs when the unit is calibrated.
Corrective Action: Re-calibrate the unit.
[E3]: EE EXT CAL OR EE FLEX CAL EEPROM VARIABLE ERROR
Error Action: This error prevents the CPM from entering the run mode.
Display: CALIBRATE [E3]
Cause: On power-up the microcontroller checks the values of EE_EXT_CAL and EE_FLEX_CAL.
Limits are imposed on the value of these variables at calibration. If the values read from EEPROM are
not within these limits the variable is assumed to be corrupted and an error is generated.
Corrective action: Re-calibrate the unit.
[E4]: SOFTWARE TIMER ERROR
Error Action: This error causes the microcontroller to burn 4 in the EE_ERROR EEPROM.
Display: *****STOP*****
Cause: A software variable called Timer Overflow Interrupt
Count (T01 Count) is incremented every time the timer overflows. After the value of the T01 Count
becomes greater than 2746 the timer value in EEP ROM is incremented and the 2746 is subtracted from
T01 Count. If for some reason this process fails and T01 Count becomes greater than 32000 Error 4 is
generated.
Corrective Action: Contact the Technical Service Department and inform them of the error. The main
PCB may need to be replaced.
[E5]: MOTOR SPEED MEASUREMENT ERROR
Error Action: This error causes the microcontroller to burn 5 in the EE_ERROR EEPROM and causes the
CPM to stop.
Display: *****STOP*****
Cause: With every revolution of the motor the MC33039 detects when the sensor in the motor makes
a transition. That is when the sensor goes from high to low or low to high. It generates a pulse of fixed
width. The microcontroller measures the speed of the motor by counting the number of pulses that occur
in one timer overflow period. This happens in 131 seconds. When the unit runs too fast (over 230 RPM)
the time between sensor transitions becomes less than the pulse width. The microcontroller counts 0