Internal Faults - ABB RELION REX640 Operation Manual

1MRS759118 A
6.2.1
REX640
Operation Manual
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Figure 81: Relay self-supervision status on local HMI
On the WHMI, the self-supervision status is available under Device menu. The top
right LED indicates the relay status.
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Figure 82: Relay self-supervision status on Web HMI
In addition, the last boot reason and time are shown on both LHMI and WHMI.

Internal faults

When an internal relay fault is detected, relay protection operation is disabled and the
self-supervision output contact is activated. In the main unit, the main indication of an
internal fault is a flashing green Ready LED behind the power module, and on the
HMI, a rapidly flashing red Home button.
Different actions are taken depending on the severity of the fault. The protection relay
tries to eliminate the fault by restarting. In case of a permanent fault, the protection
relay stays in the internal fault mode. All other output contacts are released and locked
Section 6
Troubleshooting
85