RELIANCE 615055-1R Automation spare parts

The power source for the onboard SRAM is an Electro Marketing EM1275 device (or equivalent, such as RAYOVAC FB1225) with two BR1225- type lithium cells. The battery is socketed for easy removal and replacement. Small capacitors are provided so that the batteries can be quickly replaced without data loss. The service life of the batteries is very dependent on the ambient temperature of the board and the power-on duty cycle. The lithium batteries supplied on the MVME172LX should provide at least two years of backup time with the board powered off and with an ambient temperature of 40° C. If the power-on duty cycle is 50% (the board is powered on half of the time), the battery lifetime is four years. At lower ambient temperatures, the backup time is correspondingly longer.

If you intend to place the board in storage

 putting the M48T58 in powersave mode by stopping the oscillator will prolong battery life. This is especially important at high ambient temperatures. To enter power-saving mode, execute the 172Bug PS command (refer to Debugger Commands in Chapter 3) or its equivalent application-specific command. When restoring the board to service, execute the 172Bug SET command (set mmddyyhhmm) after installation to restart the oscillator and initialize the clock.The SRAM is controlled by the MC2chip, and the access time is programmable. Refer to the MC2chip description in the MVME172 VME Embedded Controller Programmer’s Reference Guide for more detail.

The MVME172LX is shipped with the batteries disconnected 

(i.e., with VMEbus +5V standby voltage selected as both primary and secondary power source). If you intend to use the battery as a power source, whether primary or secondary, it is necessary to reconfigure the jumpers on J14 before installing the board. Refer to SRAM Backup Power Source Select Header (J14) on page 1-9 for available jumper configurations. The power leads from the battery are exposed on the solder side of the board. The board should not be placed on a conductive surface or stored in a conductive bag unless the battery is removed.

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