Honeywell 800 Series Manual page 14

HONEYWELL MODEL 700/800 SIGNAL PROCESSOR AND VIEWING HEAD
— Used to set the Modbus address along with the
INCREASE, DECREASE and STORE buttons
Manual Setup of Setpoints
The keypad of the signal processor is used to set the IR/UV
GAIN, RELAY ON, RATIO % (Relay Off), FFRT and mA
output option setpoints. The following section describes
this process. Also refer to Fig. 23, 24, 25, 26 and 27.
Setting the Viewing Head Gain
The gain of the IR and UV viewing heads can be adjusted.
In addition to the information in this section, refer to Fig.
27. At power-up, the 700 signal processors display codes
to tell the operator what type of viewing head and what
gain is being used. Default values are "r5" for the IR
viewing head and "u5" for the UV viewing head. The "r" or
"u" denote IR or UV viewing heads, respectively, while the
numeric digit indicates the current gain setting. The gain
can be adjusted from 1 to 9 with a gain of 5 being the
factory default gain.
To change the gain, press and hold the SET GAIN button
for two seconds until the current value is displayed. Use
the INCREASE and DECREASE buttons to change the
setting as appropriate while the value is displayed. To
store the new setting, press the STORE button until "- -" is
shown, indicating the value has been accepted.
If no activity occurs for a period of four seconds while the
value is displayed, the display will return to the operation
mode without saving the new setpoint.
To exit the menu at any time without saving changes,
simply press the RESET/rE button.
The gain is live; changes are effective immediately, but if
the displayed gain value is not stored (by pressing
STORE), and no other buttons are pressed, the processor
returns to the previous setting after four seconds.
Relay On Setpoint
The two numeric digits on the Model 700 signal processor
normally display the incoming count during operation;
that is, the number of pulses that arrive between self-
check pulses. This count ranges from 00 to 29.
Refer to Fig. 23 for a flowchart of setting the Relay On
setpoint. Press and hold the RELAY ON SETPOINT key for
two seconds to access this setpoint. The RELAY ON SET
POINT value will be displayed. If no further keys are
pressed, this display will disappear in four seconds and
the incoming count will again be displayed. If the RESET
key is pressed, the display will return immediately to
displaying the incoming count.
While the RELAY ON SET POINT is displayed, you may
increase or decrease the setting by using the INCREASE
and DECREASE arrow keys. To store the new setting, press
the STORE button until "- -" is shown, indicating the value
has been accepted.
66-2069EP—08
To exit the menu at any time without saving changes,
simply press the RESET/rE button or wait 4 seconds until
the display reverts to the incoming count value. To extend
the display time, press the RELAY ON SETPOINT button
again; the display will time out for four seconds after the
key is released if no other buttons are pressed.
The displayed value of the RELAY ON SET POINT is live;
that is, if the relay is off and the adjusted value falls below
the current flame signal count, the relay will turn on
immediately (FFRT settings are ignored). This immediate
response can be seen if the count is low and the RELAY
ON SET POINT is set above it; if the RELAY ON SET POINT
is then adjusted down to the count level, the FLAME ON
relay will be energized.
Testing for proper operation
The system must be tested after commissioning to ensure
that the flamecount produced from background radiation
is less than the flame off threshold when the monitored
flame is extinguished. (ex. When target flame is
extinguished, flamecount drops and flame relay opens).
Proper flame scanner setup is required to ensure safe
operation.
Background Burner Flame Test
Background burner flame radiation may be present when
monitoring inside of a large furnace with multiple burners.
Below are example steps for testing and resolution.
1. Turn off monitored flame, while background flames
are still present. Operate the background burner(s)
at most intense flamecount. Flame relay should be
open.
2. Restart monitored flame, and verify that flame relay
closes.
3. Turn off monitored flame while background flames
are present. Verify that flame relay opens.
4. If the flamerelay remains closed, then you are incor-
rectly detecting background flames.
5. If the scanner is detecting background flames, use
one or more of the following suggestions to correct,
and repeat test steps to ensure scanner is no longer
sensing background flames:
• Reduce UV, or IR gains.
• Re-position viewing head to sense high frequency
of target flame, and low frequency background
flame
• Re-position head to view high intensity of
monitored flame, and low intensity of background
flame.
6. Re-view setup process and make adjustments as
necessary.
IR Hold In Test
It is possible to setup the scanner so that hot refractory is
detected as flame, causing the flame relay to "hold in"
when flame has been extinguished. It is important to
setup the scanner system properly so that background
flame or refractory glow does not indicate flame presence
when the monitored flame is extinguished.
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