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FB3000 RTU Instruction Manual

D301851X012

November 2023

84 Service and Troubleshooting

2. Press the module in as you rotate it down and it snaps into place.

Figure 5-3. Replacing Power Module

3. Attach the terminal block.

5.4 Removing/Replacing the SRAM Batteries

A 3V lithium coin cell battery in each of the two power supply modules provides backup

power for the SRAM and the real time clock. These batteries operate continuously with a

typical expected cumulative operation of 4900 hours if only one power module is

installed, or 9800 hours if both power modules are installed.

A separate third lithium coin cell battery in the CPU module provides backup power for

SRAM and the real time clock only when the CPU module is physically removed from the

RTU, or if both power supply modules are physically removed from the RTU. The typical

expected cumulative operation for this third backup battery is 1250 hours.

You do not need to power down the unit to replace the SRAM backup batteries.

Important

If the unit is ever powered down without the SRAM batteries installed, SRAM data is lost;

this may include configuration data, alarms, events, and history. Always back up your

data before you remove the SRAM batteries if you know that main power will also be off.

Important

Replacement SRAM backup battery for the CPU module must be RENATA CR1632.

Important

Replacement SRAM backup batteries for the power module(s) must be one of the

following:

 RENATA CR2450HT

 MAXELL CR2450HR

 PANASONIC BR2450A

 MURATA CR2450W

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