ERL L-PRO 4000, User Manual

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Appendix D Event Messages
Appendix D-4 L-PRO 4000 User Manual D02706R02.30
vide an early indication of a problem. The Block level blocks the relay from
false-tripping by preventing any output contact from closing. The Relay Func-
tional LED turns off, but the protection functions will operate normally, with
the exception that the output contacts will not be allowed to close. The Relay
Inoperative contact will close for a Block condition. The following table de-
scribes all the Alarm/Block indication functions
The Self Check Fail signal, which is available in the Output Matrix, TUI me-
tering and SCADA, can be used to signal an alarm. Note that if this signal is
mapped to an output contact, the contact which it is mapped to will only be
closed for an alarm condition. If the relay is in the Block condition, the Relay
Inoperative contact must be used to signal an alarm.
The status of the Self Check Fail is available through the SCADA services pro-
vided by the relay. The digital signal Self Check Fail will indicate that DSP has
detected a continuous dc level and the analog metering value Self Check Fail
Parameter is used to indicate which condition, Alarm or Block. The failure
types and which analog values they are associated with are described in the ta-
ble below. Both signals are available in DNP and Modbus.
The Alarm condition is allowed to reset if the continuous dc level drops below
the pickup level. The Block condition has no reset level. If power is cycled to
the relay it will go into its normal state until the continuous dc level is detected
again.
Action Condition
Alarm Block
Relay Functional LED off X
Service Required LED on X X
Self Check Fail Signal high X X
Relay Inoperative Contact closed X
Output Contacts held open X
Event Log Message X X
Status available through SCADA X X
Point Value Condition
0 Normal
1 Alarm
2 Block
3 Alarm has evolved to block