Automatic Setup Of Setpoints - Honeywell 700 User Manual

default value). While the value is displayed, it may be changed
via the INCREASE or DECREASE arrow buttons. To store the
new setting, press the STORE button until "--" is shown,
indicating the value has been accepted.
Confirmation is not requested if the 0-20/4-20 setting is
changed when AUTOSET LED is on
The 0/4-20mA output option is live; the operative range
changes as soon as the displayed selection is changed.
However, the value must still be saved via the STORE button
in order to be saved in the signal processor's EEPROM.
To exit the menu at any time without saving changes, simply
press the RESET/rE button or wait four seconds.
The analog current output is scaled according to the RELAY
ON setting. It is scaled so that, if the counts coming in are at a
count rate equal to the RELAY ON setting, the current output
is approximately 13 MA when the range selected is 0-20 MA,
and about 14.6 MA when the range selected is 4-20 MA.
Note that the actual maximum level for the current output is
19.8 MA.

Automatic Setup of Setpoints

With this feature, the Model 700 signal processors set the
RELAY ON SET POINT, the RATIO % (Relay Off), and the UV/
IR GAIN automatically. Calculations for these settings are
carried out in the signal processor as the operator takes the
system through BURNER ON and BURNER OFF sequences.
Fig. 18, 19 and 20 flowchart the automatic setup sequence.
The FFRT (flame failure response time) and the 0/4-20mA
output option must be manually setup after the automatic
setup process is complete. Refer to the Manual Setup of
Setpoints section and Fig. 23 and 24. for details on setting
these 2 parameters.
Before starting the automatic setup sequence, adjust the
RELAY ON SET POINT to get the FLAME ON relay to
energize.
Press BNR-ON SEQ START/END key for two seconds. If the
FLAME ON relay is de-energized, the display will show "bo"
(burner off); press RESET to clear this. If the FLAME ON relay
is energized, the ON SEQ LED will start flashing slowly and
the numeric display will start counting down from 59 while the
processor takes data at one reading per second. The FLAME
ON relay will remain energized if the flame is present,
according to the current settings, until valid new values are
obtained. To end the data sampling, press the same button,
BNR-ON SEQ START/END, again, but ensure that an
adequate number of data samples has been taken. At least 30
seconds of BNR-ON data sampling is recommended; ten
seconds is a minimum. The software will not respond to a
second press of the button for 10 seconds. RESET may also
be pressed while the data sampling is occurring; the data
sampling process will be aborted and the old values will
remain in effect.
After BNR-ON data sampling is complete, the OFF SEQ LED
flashes. Turn off the burner and immediately press the BNR-
OFF SEQ ST ART/END key (a two-second press is not
required). The displayed timer then counts down from 29. This
process may be interrupted, but at least 15 seconds of BNR-
OFF data sampling is recommended. The data sampling
HONEYWELL MODEL 700/800 SIGNAL PROCESSOR AND VIEWING HEAD
process can be aborted by pressing RESET, in which case the
data for both BNR-ON and BNR-OFF will be discarded and the
previous values will remain in effect.
If the data is good, that is, the computed ratio is 71% or less
when BNR-OFF data sampling is complete, the display shows
the ratio in percentage for one second, followed by "- -" to indicate
a successful setup. The signal processor then turns on the
AUTO SET LED to verify that the values stored internally were
derived from the BNR-ON/BNR- OFF data sampling sequence.
If the data received is marginal, with the computed ratio ranging
from 72% to 80%, the display alternates be- tween "AC" and
the computed ratio, for example, "AC" and "75." Press either the
ACCEPT RA TIO or RESET keys. If ACCEPT RA TIO is
pressed, the display responds with "- -", the ratio is stored,
and the AUTO SET LED is turned on. If RESET is pressed, the
display returns to the counts, both of the AUTO SETUP LEDs
are turned off, and the old setpoints are used.
If the ratio computed as a result of BNR-ON and BNR- OFF
data sampling is higher than 80%, the display will show "UA"
(unacceptable), alternating with the unacceptable ratio. For
example, if the computed ratio is 93%, the display would
alternate between "UA" and "93." RESET must be pressed to
clear this; the old values for RELA Y ON and RA TIO will remain
in effect.
The values can be worse than just unacceptable. If the flame
relay de-energizes while reading BNR-ON values, the display
will show "bo," and data-taking will be aborted. Other faults,
such as a BNR-ON flame signal that is too low to use, or BNR-
OFF readings that are too close to the BNR-ON readings, can
result in "rE" being displayed. RESET should then be pressed.
The signal processor also adjusts the viewing head gain during
the BNR-ON and BNR-OFF data sampling sequence.
Normally, after the sequence, the display should read about
20, because the gain has been adjusted to give this reading. If
it is less than about 18, you should find that the gain has been
set to 9; if it is more than about 22, you should find that the
gain has been set to 1.
Once the values have been stored through this sequence, you
can check the RELAY ON SET POINT, the RATIO, or the
GAIN by pressing the appropriate key for two seconds.
However, if you attempt to change these values by pressing
the INCREASE or DECREASE keys, the display will show
"CF" (confirm), and the AUTO SET LED will flash rapidly. To
confirm the desired change, press the RELAY ON SET-POINT
key, the RATIO key, or the SET GAIN key a second time. To
discontinue any changes, press the RESET key or simply wait
four seconds for a time out to occur.
The user confirms they wish to make changes, the values will
change when you use the INCREASE or DECREASE keys.
Meanwhile, the AUTO SET LED will be flashing. The AUTO
SET LED will de-energize only if the changed values are
stored; if the changed values were not stored, the AUTO SET
LED will light and the old values will remain in effect.
If values were obtained automatically, that is, if the AUTO SET
LED is on and the BNR-ON SEQ START/END key is pressed,
the display will also show "CF." If the BNR-ON SEQ START/
END key is pressed again, the signal processor will begin the
BNR-ON data sampling sequence.
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