Table 8:
Front communication LEDs
LED
Communication ok
Uplink
Steady green light
Communication
Flashing yellow light
6.1.3.2
Checking time synchronization
•
Check the time synchronization via LHMI in
Main Menu/Relay Status/
Monitoring/IED status/Time synchronization
.
6.1.4
Checking local HMI connectivity
If the connection between the LHMI and the relay is lost, check the following.
1.
Check that the RJ-45 cable is properly connected between the LHMI's main unit
port X1.1. and the X0 port (HMI) of the relay's communication card.
If the station communication connection (a LAN port of the communication
card) is used between the LHMI and the relay, see chapter
to a relay through station network
to check the proper connection.
2.
Check that the LHMI is paired with the relay. See chapter
.
6.2
Self-supervision
The protection relay's extensive self-supervision system continuously supervises the
software and the electronics. 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.
There are two types of fault indications.
•
Internal faults
•
Warnings
On the LHMI, the self-supervision status is available as an advanced page under Relay
Status page. The self-supervision status is indicated with Internal Fault, Warning and
All OK LEDs. In normal operation, All OK LED is lit.
Section 6
1MRS759118 A
Troubleshooting
84
REX640
Operation Manual
