Warning

Dangerous Voltages. This equipment generates voltages that are dangerous to personnel. Use appropriate caution while operating or servicing this equipment. Capacitors can retain a substantial charge even after power has been removed. Allow at least one minute after turning off the power for the capacitors to be drained of charge–then check the safety lamps inside provided for this purpose. Do Not Depend on Interlocks. Never depend on an interlock switch alone to render the equipment safe. Always look for the condition of the High Voltage Indicating Lights and check circuits with a voltmeter. Do not disable the safety interlock switch.

There are two versions of this L849, they are as follows

• -I = Current based
• -V = Voltage Based

Either of these can be made the following styles

• Style A
• Style E

Access - L-849-I-A/E Current & Voltage

The power supply cover is secured by quarter-turn latches with padlock provisions on the two front corners of the enclosure. A co-mounted unit also has two self-releasing latches across the hinge. The hinged cover when fully opened is supported by a lanyard. The flash head does not have to be accessed for installation, even if it is mounted separately. The front bezel can be removed to gain access to the flash lamp by loosening four captive screws. A plate secured by two captive screws at the rear of the housing allows access to other internal flash head components.

 

Current Based:

Functional Description - L-849-I-A/E Current

The main circuit board, PCB-1, is identical in each power supply whether it is a Master unit or a Slave. They communicate with one another over the interconnecting control line. Master units have an additional circuit board (PCB-101) that is part of a CSM-112 Current Sensing Module. The Current Sensing Module monitors the level of current in the Series Lighting Circuit (SLC) and provides adjustments for setting flash intensity switching. The equipment was set up at the factory to comply with sales order details concerning flash intensity and current level (CCR Step settings), but it will likely be necessary to “fine tune” the adjustments in the field due to the many variables that can affect these adjustments, such as the type of CCR driving the SLC (3-step or 5-step), and the presence of other loads. This is especially true of CCRs that do not produce a sinusoidal current waveform. Some applications require only one level of intensity. Setup procedures are on Pages 8 through 11 of this manual. Slave units do not require set up adjustments.  Flash intensity may be controlled at the master unit by a selector switch on the control module, or remotely controlled by the CCR brightness step. 

Applications and Programming - L-849-I-A/E Current

These lights may be used in REIL applications. Switch SW1 on PCB-1 controls when the light will flash; SW2 controls the rate at which flashes repeat. The rate is generally 120 flashes per minute. These switches are initially set at the factory to comply with the airfield application, but they can easily be programmed differently in the field. See Figure 5a PCB-1. See Figure 5b Programming Switches. The lights in a REIL system must flash simultaneously, therefore SW1 in the Master and the Slave must be programmed identically; and of course the same applies to SW2 for flash rate with the exception of SW2-8. SW2-8 must be in the OFF (open) position in a Master unit, but it should be in the ON position in a Slave unit. When SW2-8 is in the ON position, the slave unit will flash only if it receives a signal over the control line from the master unit. Switch programming diagrams are also attached to the inside cover of every power supply.

 

Voltage Based:

Functional Description - L-849-V-A/E Voltage

Each power supply, whether it is a master unit or a slave, has an identical PCB-1 circuit board for timing and control functions. These circuit boards communicate with one another over an interconnecting control line. System power for up to seven lights is typically controlled by a circuit breaker that is part of a control module located in the master unit. Larger systems may require an auxiliary power contactor. Flash intensity may be controlled at the master unit by a selector switch on the control module, or remotely by a selector switch or L-854 radio receiver. The control module is also available with an option that enables the system to be controlled by a Series Lighting Circuit.

Applications and Programming - L-849-V-A/E Voltage

These lights may be used in REIL applications. The two lights in a REIL system must flash simultaneously. Switch SW1 on PCB-1 controls when the light will flash, i.e., simultaneously, or sequentially. SW2 controls the rate at which flashes repeat. See Figures 9a and 9b. The rate is generally 120 flashes per minute. These switches are initially set at the factory to comply with the application as ordered, although changes can easily be made in the field. Since the lights in a REIL system must flash simultaneously SW1 in the Master unit and the Slave must be programmed identically, and of course the same applies to SW2 for flash rate, with the exception of SW2-8. SW2-8 must be in the OFF position in a Master unit, but it should in the ON position in a Slave unit. Switch programming diagrams are also attached to the inside cover of every power supply.

 

Airport Lighting Company | L-849-V-A/E / L-849-I-A/E Unidirectional Runway Approach Lights - System Operation