ABB REX 521, Руководство оператора

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1MRS 751107-MUM Protection Relay
Operator’s Manual
REX 521
Fig. 3.1.5.-1 Adjusting display contrast
• The display contrast may be adjusted anywhere in the menu structure except in
the setting menus where the [E] button is used for entering the setting mode.
• The selected contrast value is stored in a non-volatile memory and thus, after an
auxiliary power failure, the contrast is restored automatically.
3.1.6. Display test
Upon auxiliary voltage connection, the backlight is turned on and a short display test
is run. This display test includes all the LEDs and the LCD. The LEDs are tested by
turning them on simultaneously while the LCD shows two patterns so that all the
pixels are activated. After the test, the display returns to normal state.
• The display test can also be started manually by navigating to
Configuration\Display\Test display
and then selecting
Test display
(refer to section “Menu chart” on page 15).
3.1.7. Selecting primary values
The setting values, input data and recorded values that are relative to some quantity
can be obtained directly in amperes and volts. For the relay to know how to convert
between primary and per unit values, the setting values describing the measurement
devices (CT, VT, VD, RS) need to be properly set.
1. Navigate to
Configuration\Display\Primary values
and select
Primary values
instead of the default
Per unit
values.
2. Navigate to Configuration\Meas. devices and enter the data for all
the CTs and VTs, VDs and RSs that are in use in that particular hardware. For
information about setting the rated values for the protected unit and about the
technical data of the measuring devices, refer to
Technical Reference Manual,
General (see “Related documents” on page 6).
3.1.8. Optically isolated serial communication port
The front panel of the protection relay is provided with an optical serial
communication connector. The connector is used for programming the relay with a
PC via a RS-232 cable, type 1MKC950001-1.
E
Contr
Push and
Increase
Decrease