Maintenance

Replacement Procedures

Replacing the battery

A lithium battery is used as a keep alive voltage for the volatile memory (RAM) that contains the controller configuration. The battery is installed in a compartment on the CPU module. Follow the steps in the table below to replace the CPU battery.

CAUTION

The battery used in this device may present a risk of fire or chemical burn if mistreated. Do not recharge, disassemble, heat above 212 °F (100 °C), or incinerate. Replace battery with Tadiran TL-5101/SBP only. Use of another battery may present a risk of fire or explosion.

Step

1

2

3

Action

Locate the battery and the battery compartment location on the CPU module. See Figure 36.

Using a Phillips-head screwdriver, loosen the screw and remove the battery compartment cover.

For the standard CPU module –

Using a screwdriver, insert it through the screw hole on the front and carefully pry the battery out of its holder. Carefully remove battery from the holder.

For the CPU module option –

The battery holder is contained on the battery compartment cover. See figure. Carefully remove battery from the holder.

Battery Compartment Cover

Battery

- +

4

5

6

Observing the correct polarity, insert a new battery into the holder.

Verify that the LoBATT LED is off.

If LED is lit, the battery may installed incorrectly. Check polarity of battery and reinstall, if necessary.

Replace the compartment cover and secure with the screw.

NOTE: If controller power is restored and the battery-backed RAM has failed, field calibration of the AI modules must be performed if greater than 0.1% accuracy is required.

WARNING

Dispose of used battery promptly.

Keep away from children. Do not disassemble and do not dispose of in fire.

Release F

UMC800 Controller Installation and User Guide

73

4/01

 

 

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Image 81
Honeywell UMC800 manual Replacing the battery, For the standard CPU module