ABB RELION 620 Series Technical Manual page 71

1MAC504801-IB E
620 series ANSI
Technical Manual
Different actions are taken depending on the severity of the fault. The protection relay tries
to eliminate the fault by restarting. After the fault is found to be permanent, the protection
relay stays in internal fault mode. All other output contacts are released and locked for the
internal fault. The protection relay continues to perform internal tests during the fault
situation.
If an internal fault disappears, the green Normal LED stops flashing and the protection
relay returns to the normal service state. The fault indication message remains on the
display until manually cleared.
The self-supervision signal output operates on the closed circuit principle. Under normal
conditions the relay is energized and the contact gap 3-5 in slot X100 is closed. If the
auxiliary power supply fails or an internal fault is detected, the contact gap 3-5 is
opened.
A070789 V1 EN
Figure 12: Output contact
The internal fault code indicates the type of internal relay fault. When a fault appears,
record the code so that it can be reported to ABB customer service.
Table 29: Internal fault indications and codes
Fault indication
Internal Fault
System error
Internal Fault
File system error
Internal Fault
Test
Internal Fault
SW watchdog error
Internal Fault
SO-relay(s),X105
Table continues on next page
Fault code Additional information
2 An internal system error has occurred.
7 A file system error has occurred.
8 Internal fault test activated manually by the
user
10 Watchdog reset has occurred too many
times within an hour.
40 Faulty Signal Output relay(s) in card
located in slot X105
Section 3
Basic functions
65