Specifications

FTB 312-4 Revision 4 – 1-8-2008 1
Section 1 – Introduction
and Operation
System
Each single FTB 312-4 System consists of
a FH 306 Flashhead, a PC 312-4 Power
Converter, a PEC 510 Photocell, and a
connecting cable from the power converter
to the flashhead.
The power converter supplies the
controlling circuitry to convert main AC
power to the required voltages for internal
operation and the discharge energy for the
flashhead. It also controls the flash rate.
The photocell senses changes in lighting
conditions from day to night and from
night to day thus signaling the power
converter to change its operation
appropriately. Also, a manual intensity
switch can override the photocell if
required.
Specifications
Physical
PC 312-4 (H x W x D, Weight)
14.00 x 16.75 x 8.44 in., 51 lbs.
355.6 x 425.5 x 214.4 mm, 23 kg.
FH 306 (H x Diameter, Weight)
17 x 18.25 in., 17 lbs.
431.8 x 463.5 mm, 7.7 kg.
PEC 510 Photocell (H x W x Depth)
3.06 x 2.58 x 1.02 in.
77.7 x 65.5 x 2.59 mm
Aerodynamic Wind Area
Flashhead 0.93 ft
2
, 0.0864 m
2
Power Converter 1.63 ft
2
, 0.15 m
2
Environmental
Complies with FAA specifications in
AC 150/5345-43.
Performance Characteristics
Application - L-865 and L-864
Flash Intensity (nominal):
Day (White) 20,000 ± 25% ECD
Night (Red) 2,000 ± 25% ECD
White Backup 2,000 ± 25% ECD
Beam Spread Horizontal: 360º
Vertical: 5º
Flash Rate
Day (White) 40 flashes per min.
Night (Red) 20 flashes per min.
White backup 40 flashes per min.
Electrical (PC 312-4)
AC Voltage 120 or 240V, 60 Hz
110 or 230V, 50 Hz
208-240V 50 Hz
Volt-Amperes 250 peak
Day (White) 130W
Night (Red) 250W
White Backup 75W
Operation
The PC 312-4 Power Converter operates
an FH 306. It monitors flashhead operation
and signals an alarm if a failure occurs.
The flashhead begins to operate as soon as
power is applied. A photocell controls
intensity for the system.
In daylight, lights flash white at a rate of
40 flashes per minute (FPM) at an
intensity of 20,000 candelas. At night the
light flashes red at a rate of 20 FPM at an
intensity of 2,000 candelas.
Obstructions over 350 feet above ground
level require several interconnected PC
312-4 power converters (typically three)
operating the corresponding number of
flashheads. A master/slave control line
(two-wire) at terminals TB1-4 and TB1-5
at the front panel interconnects the units.
A sync pulse on the line flashes all the
lights in unison and at the same rate.