UTC Fire and Security Det-Tronics R8471B Instructions Manual page 9

An alarm condition will normally over-ride a fault
condition unless the fault condition occurred first.
F10 and F2X will not over-ride an alarm. Faults that
affect the actual function of the controller (F50, F60,
F70, F9X) can impair the ability of the controller to
maintain an alarm output.
All faults automatically reset except the F9X, F20,
and F10 faults. After the fault condition has been
corrected, the fault output automatically switches to
the normal (energized) state, the dc current output
returns to normal, and the FAULT LED turns off.
Clearing F9X faults requires removing operating
power from the controller for approximately one
second.
CAUTION
The fault detection circuitry does not monitor the
operation of external response equipment or the
external wiring to these devices. It is important that
these devices be checked periodically to ensure
that they are operational.
Operating Modes
The following section is intended to acquaint the
operator with the basic operation of the controller.
For complete step-by-step programming and
calibration procedures, refer to the corresponding
sections in this manual.
POWER-UP
HOLD RESET
7 SEC.
TIME DELAY
RESET
NORMAL
< 0.5 SEC.
SET
1.0 SEC.
*
MUST BE PRESSED BEFORE THE ZERO
CALCULATIONS ARE COMPLETED.
C1385
2.1
NOTE
HOLD
RESET
BASIC
RESET
0.5 SEC
RESET
NO
PUSHED WITH
SET?
YES
Figure 5—R8471B Controller Flow Chart
The controller can operate in any of the following
modes. Operating modes other than Normal are
selected by pressing the appropriate pushbutton(s)
located on the controller front panel. See Figure 5.
NORMAL
In the Normal operating mode with no alarm
condition:
— Digital display is on and indicates the sensor input
in ppm.
— Bar graph display reads the same as the digital
display.
— All LEDs are off.
— Alarm outputs are in their normal state (energized
or de-energized as programmed).
— DC current output signal level corresponds to sen-
sor input.
— Fault output is energized.
In the Normal operating mode with a low and/or auxil-
iary alarm condition occurring:
— Digital display and bar graph display indicate the
sensor input in ppm.
HOLD
RESET
FORCED SETPOINT
RESET DISPLAY
1.0 SEC.
SETPOINT
ADJUST
CURRENT
CALIBRATE
7
HOLD
RESET
CALIBRATE
9.0 SEC.
*
SET
RESET
SENSOR
REPLACE
95-8401