Power Monitor CCA (A17)

TM 32-5865-069-24&P

3-3.12 Power Monitor CCA (A17), Functional Description. Refer to figure 3-13, a

functional block diagram of A17. A17 provides overvoltage protection for the CCAs

in the RSPU. Crow-bar device VR1 monitors the power supply voltages. When there

is an overvoltage condition, the device short-circuits the power supply. The

short circuit causes the overcurrent protection circuit, part of each power supply

module, to operate.

switches U1 and U2. The absence of either +/-l5V at the input to Ul, or +5V at

the input of U2 cause lamp driver Q1 to switch off.