Bristol Babcock 396572-02-2

CPU modules have a coin cell socket that accepts a 3.0V, 220 mA-hr 

lithium battery. This battery provides backup power for the real-time 

clock and the system’s Static RAM (SRAM).

The Power Supply/Sequencer module (PSSM) takes power from an 

external bulk DC power supply and then provides power through the 

ControlWave Micro housing/backplane to all installed modules.

The PSSM operates from +10.7 to +30 Vdc or from +21.7 to +30 Vdc. 

You configure the nominal input supply configuration (12V or 24V) 

using configuration jumper switches on the PSSM. 

The PSSM includes: 

 a wide input range Vin to 3.3V DC to DC Converter 

 1200 msec good power detection circuitry 

 Vin out-of-specifications detection circuitry 

 Watchdog output connector 

 Status LEDs 

 Vin 12-bit serial analog to digital converter 

There are two versions of the PSSM currently available for the 

ControlWave Micro. One version includes a keyed run/remote/local 

switch (see Figure 1-4); the other version includes a mode switch (see 

Figure 1-5). Chapter 2 includes instructions for setting these switches 

and configuring the PSSM.

Board Fuse The PSSM is fused to protect the entire system using a 5x20mm slow 

blow fuse F1 rated at 3 Amps.

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