FTB 312 and FTS 316
Revision13 — 02-20-2001
3-15
Using the Intensity Select Switches —
Finding the Failing Unit at Night
For normal operation, set the intensity select
switches on each unit to AUTO. In AUTO, an
intensity signal through the master/slave inter-
connect wires on TB1-4 and TB1-5 controls the
day or night intensity level of all power converters
and associated lights. Any power converter may
send the sync signal on these wires, which flashes
all lights at the same time. Normally, all units on
a structure have backup enabled. Should a flash-
head fail in AUTO night operation, the power con-
verter with the failing flashhead sends a back-up
signal to the other units on the interconnect
wires. If the failing flashhead is the top-most and
is correctly connected to the master, all strobes
will go into white back-up mode.
You can switch any unit to day or night operation
(manual operation) with its intensity select
switch. In manual operation, the following condi-
tions occur on the switched power converter:
In Night Mode:
•
It does not send a back-up signal.
•
It operates the red light only.
•
It clears its red alarm (if it has one) and then
re-establishes the alarm.
•
It does not affect the other units.
In Day Mode:
•
It ignores the master/slave interconnect line
(sync and back-up signals).
•
It operates the white light only.
When a topmost red light alarm occurs at night,
the back-up signal from the failing master power
converter switches all units to night intensity
white operation. With the preceding information,
you can determine master unit in the system is
causing the entire system to run in white night
intensity.
Table 3-8 Filter Function Voltage Check
VOTAGE
PROCEDURE
120-135 VAC
between
TB2-4 and TB2-5
at night
This voltage drives the filter actuator to the up position for night operation. The voltage should not
be present in daylight.
To test this voltage in daylight:
1) Turn the Intensity Select Switch to Manual Night Mode
2) Measure the voltage between TB2-4 and TB2-5.
3) The meter should read 120-135 VAC.
4) Switch the unit to Manual Day Mode
5) The meter should read approximately zero (0) volts.
If the voltage is not present at night, or it is present during the day, the problem is most likely in the
power converter.
13-17 VAC
or
24-27 VAC
between
TB2-5 and TB2-6
Use the following procedure:
1) Place meter leads (0-50 VAC range) between main panel terminals TB2-5 and TB2-6.
2) Turn the Intensity Select Switch to Manual Day Mode.
3) The meter should read 13 to 17 VAC and -12 to -17 VDC.
If this voltage is not present, the problem is most likely in the power converter.
4) Leaving the meter leads connected, turn the Intensity Select Switch to Manual Night Mode. The
meter should read 24-27 VAC for about 6 seconds.
If the voltage did not increase from 12-17 VAC to 24-27 VAC, the filter did not move. The problem is
most likely in the power converter.
After six (6) seconds, the voltage should drop to 13 to 17 VAC and read +12 to +17 VDC.
If the voltage does not drop to 13 to 17 VAC and instead reads 24 to 27 VAC, or after 20 seconds a
red alarm is indicated, and the light goes into white night backup mode, the red filter is not up.
Summary of Contents for FTB 312-3
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