ConMed ExcaliburPLUS PC - Page 44

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Failure of any of the above self-tests will result in
the end of program executions, and a display of
“Err” or “ACC” on the Cut display. A Machine
Fault tone is sounded to alert the operator and a
fault code is displayed on the Coag Power Level
LEDs. See Appendix A for a list of the codes and
possible causes.
3.4.2. Working Program Functions
The main program loop is executed continuously
by calling the working subroutines and refreshing
the Watchdog Timer circuit on each pass through
the loop.
Bipolar, hand control, foot switch, and return
electrode inputs are monitored for changes. The
validity of the input conditions are checked. The
following conditions are considered illegal
requests and result in a operator error tone:
Simultaneous monopolar and bipolar requests.
*Simultaneous Coag and Cut requests.
*More than two simultaneous requests.
*Any activation request other than bipolar with
the Return Fault indicator ON.
*Attempt to store a setup at the “0” or “P”
program locations.
* Any request for power change while activated,
except for the activated mode.
* Any request for power change in Remote Power
Control except controlling handpiece.
In the case of an illegal hand/foot request, the last
valid request is the one honored. Other operator
actions that can result in a pulsing operator error
tone are multiple or stuck key press, or attempt-
ing to increase or decrease power levels beyond
the machine limits.
The current condition of the hand/foot controls
and the keyboard are continuously monitored.
When a valid request to change mode or power
level is received, the displays are updated to reflect +
the change. When a valid request for RF activity
is received, the following sequence is performed:
1. The appropriate RF indicator lamp and tone
are activated.
2. The requested accessory output relay is closed.
3-10 rs
3. The current limit fail-safe is set.
4. The power setting is used to retrieve waveform
and amplitude parameters from the calibration
memory which are then sent to the RF drive cir-
cuits.
5. RF output is enabled via /RFEN.
Self-tests are continuously performed during
operation to ensure the integrity and reasonable-
ness of hardware and software operation during
the working program execution. Failure of these
tests will result in a safe end-to-program execu-
tion (RF drive and all relays are disabled). A dis-
play of “Err” on the Cut power levels LEDs and
a loud alarm tone alerts the operator to the condi-
tion. The appropriate error code is displayed on
the Coag Power level LEDs to indicate the errors.
3.4.3 CAL Mode Software
The CAL mode is used to calibrate the unit. It
also provides access to Watchdog Timer and
Pseudo Run Mode diagnostics, which are provid-
ed to simplify troubleshooting of faults which
would otherwise leave the unit inoperative due to
fault detection shutdown in RUN mode. A final
function is the ability to view the Last Fault Code
(LFC) that occurred in RUN mode, and to clear
the LFC.
When CAL mode is first entered, a display check
occurs for 30 seconds or until any key is pressed.
At that point an abbreviated self diagnostics
occurs, and if successful, CAL mode is entered.
3.4.3.1 Calibration
Calibration mode allows the technician to modify
the calibration tables to correct for drift over
time, or to correct for new components after a
repair. During Power Calibration, each calibration
table value can be adjusted up or down when the
unit is activated, The adjustment range for each
entry is limited to + 25% around a nominal set-
ting. The adjusted calibration value is stored in
nonvolatile memory, additionally, both the base
voltage drive (VBASE) and gate drive waveform
(/GATE) are sampled and stored to act as refer-
ences for checking over power conditions.
NOTE: Since VBASE is in the output voltage