Honeywell UMC800 - Manual (Page 81)

Maintenance
Replacement Procedures
Release F UMC800 Controller Installation and User Guide 73
4/01
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 Action
1 Locate the battery and the battery compartment location on the CPU module. See Figure 36.
2 Using a Phillips-head screwdriver, loosen the screw and remove the battery compartment
cover.
3 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 Observing the correct polarity, insert a new battery into the holder.
5 Verify that the LoBATT LED is off.
If LED is lit, the battery may installed incorrectly. Check polarity of battery and reinstall, if
necessary.
6 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.