Siemens 7SA511 manual Display Panel, On/Off switch, Nameplate, LEDs

7SA511 Line Protection Relay Chapter 5

Display Panel

This 32-character liquid crystal display (LCD) is made up of two lines of text, 16 characters each. There are two modes of operation for the LCD.

The display mode is the normal operating mode. You can read information, but you cannot change it. The information that is displayed during normal (i.e., no-fault) system conditions is user-selectable through the configuration process. Stored event

￿data can be recalled and analyzed in this mode.

The programming mode is activated by the relay password (see section 5.3.2). Relay configuration data is displayed in this mode. The relay stays in programming mode until you change and save at least one setting. The normal protective functions of the relay continue to be operational while in programming mode. New settings do not take affect until you exit programming mode.

Note: The LCD is not capable of displaying subscript characters. As a result, lowercase characters are used for the subscripts in the display (e.g., IPH becomes Iph and IE becomes Ie). In this manual, specific references to the LCD text show the symbols as they appear in the display. Otherwise, symbols with correct case and subscripts are used.

On/Off switch

supply module is switched off, so the relay is effectively disabled or blocked in this state. This switch should stay in the “On ” position after the relay has been properly installed, programmed, and commissioned. The relay is switched off for certain maintenance and testing procedures. Refer to Chapt 8 for more information on the use of this switch during maintenance.

This switchPowercont ols the operational state of the relay. When the switch is in the “Off” position, the microprocessor is reset and processing stops. Secondary (DC) power output from the power

Nameplate

The nameplate identifies several things about your relay such as rated current and DC supply voltage. The relay model number is printed at the top of the nameplate, and how to interpret the model number is described in Chapter 1 section 1.3, “Relay Model Number.”

LEDs

The 7SA511 relay has 16 LEDs, 14 of which can be programmed (see Figure 5-1). The LEDs that cannot￿be changed are as follows:

- Lights up GREEN to indicate the relay is working properly. Normally, this indicator always will be on. It will be off if the On/Offswitch is in the “Off ” position or if power to the relay is interrupted. It will also be off if any of the internal failure monitoring functions detect a device failure.

July 27, 1995 5-5