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RB-6 L-801A (Airport) Rotating Beacon (Export)
Optional Photocell Assembly
4. Theory of Operation
RB-6 Rotating Beacon
Operations
Optional Heater Assembly
Operations
2001 Siemens Airfield Solutions, Incorporated
All rights reserved
See Figure 7-2 the Wiring Schematics section. An optional photocell
assembly is available to automatically turn the beacon on at dusk and off at
dawn.
This subsection describes the operations of the RB-6, the optional heater
assembly, and the optional photocell assembly.
See Figure 7-1 the Wiring Schematics section. Power is connected to TB1
terminals L1 (120 Vac) and N (neutral). Power is supplied through fuse F1
to motor relay K1. Relay K1 is a motor starting relay. When power is first
applied, 120 Vac is present at K1 pins 2 and 3. Relay pin 3 is connected to
the motor main winding and pin 2 is connected to the start winding. When
the motor is first turned on, it draws a current greater than 4.4 A, energizing
the relay and placing 120 Vac on pin 2. After the motor has reached its
operating speed, the current drops to less than 3.2 A and relay K1 de-
energizes. This disconnects 120 Vac from the motor start winding. 120
Vac is continuously connected to the motor main winding at relay K1 pin 3.
Power is supplied to the lamps through fuse F2, brush brackets #2 and #3,
and terminal blocks TB3 and TB4.
See Figure 2-3. The optional heater assembly consists of a 400-watt
heating element, thermostat, and safety fuse. The heater assembly should be
connected through a power cord to a separate circuit breaker, so that it may
remain operable when the beacon is turned off. The circuit breaker should
be switched off during the summer months.
When the temperature drops below +14 °F (-10 °C), the thermostat
activates the heater, which is attached to the motor gear box. The gear box
lubricant is warmed and this facilitates rotation of the beacon when it is
energized; the more effective lubrication which results also extends the
service life of the motor.
96A0221B
Issued 5/01
Description
Page 2-8
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