Siemens 7SA511 manual Erasing Stored Data

7SA511 Line Protection Relay Maintenance

occurs. This battery should be replaced at least every five years to avoid unexpected loss of fault data. A lithium battery 3 V/I Ah, type CR 1/2 AA, is the recommended type of replacement battery.

The battery is located at the rear edge of the processor board of the basic module as shown in Figure 8-1.

The relay must be removed from its housing (see “Installation” section 4.3.2) to replace the backup battery. Removing the relay from the housing will disconnect the external power, so if the currently stored fault data is to be retrieved, it must be done before removing the relay from the housing.

Following all recommended safety procedures, replace the backup battery as follows:

1.If desired, retrieve the currently stored fault data through either of the serial ports or by readout through the LCD on the operator panel (address block 5000). (Note: Configuration data is stored in a different memory and is not affected by this process.)

2.Remove the relay from the housing as described in “Installation” section 4.3.2.

3.Remove the used battery from the terminals according to Figure 8-1. Caution: Do not place battery on conductive surfaces.

4.Replace the used battery with the same or equivalent type. If required, see “Installation” section 4.6, Figure 4-5, for instructions on preparing the battery for installation.

5.Insert the battery into the terminals as shown in Figure 8-1 and tighten the screws.

6.Reinstall the relay module in the housing as described in “Installation” section 4.3.2.

7.Set the clock to the correct date and time either through the operator panel or the front serial port.

8.Return the relay to service.

8.5 Erasing Stored Data (8200)

The data stored in the nonvolatile memory can be erased using the control functions at address block 8200. The relay must be placed in programming mode using the password (see Chapter 5, “Programming the Relay”). The Reset block at 8200 allows the stored data to be cleared in five separate groups using addresses 8201 through 8205. Table 8-1 identifies the data reset options.

8-6 July 27, 1995