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BCS6000C-9
Enter CYCLE time settings (seconds) for the Draft control loop. This loop provides
duplex time proportional control outputs for the exhaust damper actuator and has
separate Open and Close cycle times similar to the DPS instrument it replaces.
AUTO TUNE
The Material, Stack and Draft control PID loops are each equipped with an AUTO TUNE button.
Please note the following before initiating the auto tune procedure:
Make a note of the existing tuning parameters on the Control Loop Tuning Screen before
beginning Auto Tune. Factory default settings are given in the Configuration Record
Sheet.
Only one loop at a time may be tuned.
The process should be operating under normal conditions before beginning the Auto
Tune procedure. Do not change material feed rate, mix or setpoint while Auto Tune is in
progress.
Stabilize the temperature or draft as close as possible to the setpoint in MANUAL, then
switch the loop to AUTO and press the AUTO TUNE button to begin.
For the Material and Stack temperature control loops, burner OUTPUT must be less
than 60% for the Auto Tune sequence to be preformed. Auto Tune will increase burner
output by 10% and calculate new gain and reset values based on the process response.
Auto Tune will be complete after the associated temperature has increased by
approximately 40
°F (4°C). Consult Hauck’s Service department if a larger or smaller
step is required.
For Draft control, the loop will be cycled between 100% and 0% three times during the
course of the Auto Tune procedure.
Auto Tune may be interrupted, if necessary, by placing the control loop in manual.
The resulting GAIN and RESET parameters (GAIN only for Draft control) will be
automatically updated when the sequence is completed.
For processes with significant dead time (such as a rotary dryer) it may be desirable to
decrease the GAIN parameter.
RUN MENU Screen
After all loop tuning settings have been recorded return to the MAIN MENU, then press RUN
MENU to display the run menu screen. This screen provides control mode selection, startup
ramp settings for automatic temperature control, low fire drive alarm settings, and draft control
setpoints.
DRAFT CONTROL
Enter a Draft Control PURGE SETPOINT for use during the burner purge sequence.
This value is normally set higher than the normal draft setpoint in order to prevent
dusting as the air damper drives open for purge.
Enter LOW FIRE and HIGH FIRE SETPOINTS for Draft Control. The draft setpoint will
automatically ramp from the low fire to the high fire setpoint as the burner firing rate
increases.
Enter a TRANSFER DELAY time in seconds to set the length of time after burner ignition
is initiated that the purge setpoint remains active for Draft Control before transferring to
the normal operating setpoint.
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