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Chapter 9
Maintenance
This chapter provides maintenance information to help maintain proper UPS operation.
Routine Maintenance
The Eaton 9PXM system is designed to provide years of trouble-free operation. Its internal control system
checks the batteries and inverter periodically to ensure reliable operation.
The Eaton 9PXM UPS and optional external battery cabinets do require some attention to assure continued
reliable service. Follow Eaton's recommended maintenance schedule, which includes:
Check operating environment for clean, cool, dry conditions.
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Inspect and clean the area around the UPS
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Check operation of fans (power modules).
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Check the batteries.
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For more information on preventive maintenance checks, contact your service representative.
Storage Temperature
Store the Eaton 9PXM battery packs (in the UPS or external battery cabinet) at –20 to +40°C (–4 to +104°F).
Batteries will have a longer shelf life if they are kept below +25°C (+77°F). The Eaton 9PXM UPS or battery
cabinet without batteries may be stored at –40 to +60°C (–40 to +140°F).
External Bypass Switch (Make-Before-Break Only) Operation
Press the red button beside the switch before turning the Eaton MBB bypass switch. This button:
Sends an electrical signal to the UPS to switch to the internal Bypass mode (if it is not already operating in
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that mode).
Operates a mechanical interlock, to prevent the switch from being turned without first signaling the UPS.
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See "Bypass Module Operation" on page 26 for additional information.
Battery Replacement
The Eaton 9PXM hot-swappable feature lets you replace the battery modules without disconnecting the load
or damaging the batteries.
NOTE 1
Observe important safety precautions while performing these checks.
NOTE 2
Eaton recommends that you schedule preventive maintenance checks at least every
six months.
NOTE
When the red button is released, the UPS remains in its internal Bypass mode.
Return the UPS to Auto mode by selecting that mode on the front panel display.
NOTE
The Eaton 9PXM UPS will operate with uncharged (or no) batteries, but will have
limited (or no) battery backup capability. The recommended backup is one battery
module for each power module. The UPS may indicate an alarm with no batteries
present.
Eaton 9PXM UPS (4-20 kVA) User's Guide
P-164000669—Rev 05
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