Table 17: Front communication LEDs
LED Communication ok
Uplink Steady green light
Communication Flashing yellow light
7.1.3.2 Checking time synchronization
• Check the time synchronization via LHMI in Main menu/Monitoring/IED
status/Time synchronization.
7.1.4 Running the display test
A short display test is always run, when auxiliary voltage is connected to the
protection relay. The display test can also be run manually.
•
Press simultaneously and .
All the LEDs are tested by turning them on simultaneously. The display shows
a set of patterns so that all the pixels are activated. After the test, the display
returns to normal state.
Clear any indications on the display before running the display test
manually.
7.2 Self-supervision
The protection relay's extensive self-supervision system continuously supervises
the relay’s software, hardware and certain external circuits. It handles the run-time
fault situation and informs the user about a fault via the LHMI, the relay's main
unit power module Ready LED and through the communication channels. The
target of the self-supervision is to safeguard the relay’s reliability by increasing
both dependability and security. The dependability can be described as the relay’s
ability to operate when required. The security can be described as the relay
scheme’s ability to refrain from operating when not required. The dependability is
increased by letting the system operators know about the problem, giving them a
chance to take the necessary actions as soon as possible. The security is increased
by preventing the relay from making false decisions, such as issuing false control
commands.
There are two types of fault indications.
• Internal faults
• Warnings
Section 7 2NGA000823 A
Troubleshooting
58 REX610
Operation Manual
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