Section 5847 User Instructions
Issue AL, July 24, 2006 Spec. Nos. 586505000 and 5865055000 (Model LMS1000)
Page 4-2 Chapter 4. Maintaining LMS1000
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Systems, North America, Inc. Any copying, use, or disclosure of it without the written permission of Emerson Network Power, Energy Systems, North America, Inc. is strictly prohibited.
REPLACING THE CPU MEMORY BACKUP BATTERY
(586505000/586505500 MAIN CABINET
OR 582140000 PRIMARY BAY ONLY)
Caution: Danger of explosion if battery is incorrectly replaced. Replace only with
the same or equivalent type recommended by the manufacturer. Dispose
of used batteries according to the manufacturer's instructions.
Emerson Network Power recommends that the memory backup battery be replaced once
a year.
The CPU circuit card employs a 3 volt 170 mAH lithium battery (P/N 241163100) which
has a shelf life of ten years. Under typical discharge conditions (25 degrees C), the
battery can power the memory for about 5000 hours. If the circuit card is removed from
service for an extended period of time, the battery should be insulated from the battery
holding clamp using a piece of cardstock or similar material. However, this action will
destroy all contents of the memory and clock. If it is necessary to save the configuration
of a system, download the information to a floppy disk and then later upload the
information back into the system. Refer to "UPLOADING AND DOWNLOADING THE
CONFIGURATION" in "Chapter 2. Operating LMS1000".
When the lithium battery reaches approximately 2.5 volts, a local indicator illuminates.
When this happens it means the lithium battery, under typical conditions, will be able to
power the memory for about another ten days.
Procedure:
Note: Refer to Figure 4-1 as this procedure is performed.
1) Remove DC input power from the LMS CPU circuit card.
2) 586505000/586505500 LMS Cabinet: Rotate the two captive fasteners on the
front of the shelf until the arrow on the fastener points up or down, and pivot the
door open.
or
582140000 LPS Power System: Open the bay's front door.
3) Connect an approved grounding strap to your wrist. Attach the other end to a
suitable ground.
4) If external CPU/hardware fail alarms are connected to J4 on the circuit card,
gently remove the top half of connector J4 from the bottom half.
5) Remove the CPU circuit card by loosening the retaining screw. In a 582140000
LPS Power System, note that if a modem is installed, it also contains a bracket
with a retaining screw. Remove the modem cable, if present.
6) When you remove the CPU battery, memory is maintained because the capacitor
supplies power to the memory for at least one minute (worst case). Do not
remove the battery until the replacement battery is ready to be inserted.
7) Remove the existing battery, and insert the replacement battery, observing
correct polarity.
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