Figure 2-44. Dc Power Systems, Block Diagram

TM 11-5895-878-14&P

Figure 2-44. Dc Power Systems, Block Diagram.

60 causes the outage of two equipments performing the

2-20. Alarm Systems

same function. Minor alarms include equipment alarms

where on-line back-up equipment is available. Red

Two alarm systems (red and black) are provided in the

lights on the alarm panels indicate major alarms while

P&T (a and b below).

amber lights indicate minor alarms. The major/minor

a. Red Alarm System.

The alarm system is

panel is capable of giving a major or minor alarm

designed to alert the technical controller and

indication on a single pushbutton lamp for a single piece

maintenance personnel of equipment degradation

of equipment. The audible alarm (in the audible alarm

and/or failures by giving both an audible and visual

panel) can be silenced by pressing the lighted

alarm. Equipment covered by this alarm system are DC

pushbutton on the major/minor alarm panel.

The

distribution and fuse panels and DC power supplies

various alarm circuits are normally open contacts which

through their associated alarm panel.

The red

provide a ground to the major/minor alarm panel for a

major/minor alarm panel is in bay 2.17 (fig. 1-13). A

fault indication.

major alarm indicates a failure or degradation which 2-

2-60