7SA511 Line Protection Relay

Chapter 4

Inserting the basic module:

Position the top and bottom releasing levers fully to the left.

Ensure that the printed circuit board edges are properly positioned to enter the guide slots.

Push the module into the housing as far as it will go.

Push the top and bottom releasing levers fully to the right. This will pull the

￿module into the housing and properly engage the internal connectors.

Ensure that the module is fully inserted. One indication that modules are not fully inserted occurs when current is applied and the measured values in the LCD display are not as expected.

4.4Printed Circuit Board Locations

The 7SA511 basic module contains three printed circuit boards:

1.Power supply board identified as the SV board

2.System board containing the microprocessor (CPU), front port, and display I/O

3.GEA board containing current inputs, binary inputs, and output relays

The 7SA511 additional I/O module contains the ZEA board. This board has additional binary inputs, output relays, and LEDs,.

The location of each board is shown in Figure 4-3. Please refer to this illustration when you are required to locate components for any of the installation or maintenance procedures.

4.5 Changing the Binary Input Voltage Range

When delivered from the factory, the binary inputs will accept an input voltage of 11 VDC to 288 VDC as the active level. If it is anticipated that the active level will be 110 VDC or higher, it may be advisable to increase the active threshold to provide greater resistance to transient voltages.

Following the procedure described below will increase the threshold to approximately 65 VDC.

Increasing the binary input threshold voltage may be accomplished by removing solder bridges on printed circuit boards inside the module. The location of the solder bridges on the printed circuit boards is shown in Figure 4-4. Use the following procedure to remove a solder bridge.

Remove the basic module and the additional I/O module from the housing as described in section 4.3.2.

Locate the desired solder bridge(s) as shown in Figure 4-4. The GEA board containing binary inputs 1 through 4 is in the basic module. The ZEA board containing binary inputs 5 through 10 is in the additional I/O module.

￿Carefully cut and bend the solder bridge(s) aside..

Reinstall the module(s) in the housing as described in section 4.3.2

July 27, 1995

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Siemens 7SA511 manual Inserting the basic module, Printed Circuit Board Locations, Changing the Binary Input Voltage Range