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It Doesn’t Run Without Power—Proper Maintenance of Power Systems Maintaining the power system is critical for any of your systems and that is definitely true when dealing with the PM/APM/HPM (xPM) family. Depending on your configuration and process, the failure of proper maintenance practices and ignoring alarms from the power system could lead to failures that have the potential to bring a process or plant to a standstill. This includes loss of view, loss of control, or even loss of the process. How Proper Power System Maintenance Can Help You • Reassurance that your power system and battery back-ups are running properly • Reduced risk of downtime due to power system issues • Allows you to be proactive in your maintenance approach • Simplified ordering for maintenance items available in a kit versus individual components • Lower cost of replacement to mitigate costly unplanned system downtime • Current version of Power Supply has multiple improved characteristics Proper maintenance of the power system includes addressing the power supplies, battery backup and the CMOS memory backup batteries. The expected lifespan of each of these components is different and the lifespan of each is also affected by the environment in which they are used. Benchmarks for changing out each component are every 10 years for the power supply, every five years for the battery backup (and possibly every three), and every two years for the CMOS batteries. Honeywell now offers an upgrade kit, MC-ZPSUG2, which provides all of these components packaged together. The power supply provided is the current version with improved characteristics. Any failures of these power system components should be changed immediately.