IL42-4031C October 2012
6
The switchboard meter must have been powered within an hour prior to installing the 3.6-volt lithium battery. If
the 3.6-volt lithium battery is installed on a switchboard meter that has not been powered within the last hour, the
switchboard meter may not operate correctly and the battery may be prematurely discharged.
4. Plug the new battery in the socket and place the new battery in the battery well.
5. Replace the switchboard meter chassis in the case.
6. Close the metering switches and install the cover.
7. If you like, you can use Elster Electricity meter support software to reset the power outage log.
Replacing the outage reporting battery
The optional internal modem with outage reporting capabilities has a lithium battery present to provide energy for modem operation
during a power outage.
To replace this modem battery:
1. Ensure that the meter chassis is removed from the case.
2. Grasp the electronic housing assembly, rotate the assembly counterclockwise to detach it, and expose the CT housing with the
modem battery.
3. Remove the battery lead assembly connector from the internal modem assembly.
4. The modem battery is located in the CT housing battery well and has adhesive on each side to hold it in place during shipment.
Use a thin-bladed screwdriver tip to dislodge the adhesive. The battery can then be removed from the CT housing.
5. Replace with a new battery assembly by sliding the new battery in the CT housing battery well.
6. Plug the battery lead assembly connector into the internal modem assembly connector.
7. Replace the electronic housing assembly, rotating clockwise to lock into place.
8. Replace the meter chassis to the case, close the metering switches, and install the cover.
Wiring Diagrams
Meter Wiring
Wiring to the lower terminals on the rear of the FT-21 meter case is as shown in Figure 2, Figure 3, and Figure 4.
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