Emerson ROC827 instruction manual Replacing the Internal Battery, Replacement Battery Types

ROC827 Instruction Manual

3.5.3 Replacing the Internal Battery

The internal Sanyo 3 volt CR2430 lithium backup battery located on the CPU provides backup of the data and the Real-Time Clock when the main power is not connected. The battery has a one-year minimum backup life while the battery is installed and no power is applied to the ROC827. The battery has a ten-year backup life while the backup battery is installed and power is applied to ROC827 or when the battery is removed from the ROC827.

Recommended replacement Lithium/Manganese Dioxide batteries include:

Table 3-17. Replacement Battery Types

Part	Battery, Lithium, 3V
Size	24 mm (0.94 in) diameter x 3 mm (0.12 in) height
Type	Coin Type
Capacity	280 mAh minimum
Acceptable Types	ƒ	Duracell DL2430
	ƒ	Eveready CR2430
	ƒ	Sanyo CR2430
	ƒ	Varta CR2430

Note: Remove the internal backup battery if you intend to store the

ROC827 for an extended period.

Caution	When working on units located in a hazardous area (where explosive
	gases may be present), make sure the area is in a non-hazardous state
	before performing these procedures. Performing these procedures in a
	hazardous area could result in personal injury or property damage.

To avoid circuit damage when working inside the unit, use appropriate electrostatic discharge precautions, such as wearing a grounded wrist strap.

1.Perform the backup procedure described in “Preserving Configuration and Log Data” in Chapter 6, Troubleshooting.

Note: Removing the battery erases the contents of the ROC827’s RAM.

2.Remove all power from the ROC827.

3.Remove the wire channel cover.

4.Remove the two screws on the CPU faceplate.

5.Remove the CPU faceplate.

6.Remove the CPU (as described in “Removing the CPU Module” in Chapter 2, Installation and Use).

Issued Mar-06 Power Connections 3-25