ABB REU 523 - Self-Supervision (IRF) System

46
1MRS 750942-MUM
Combined Overvoltage and Undervoltage Relay
Technical Reference Manual
REU 523
1RWH
Parameters O9...O12 and O41 control the physical output contacts which can be
connected to e.g. circuit breakers.
4.1.11. Self-supervision (IRF) system
The REU 523 is provided with an extensive self-supervision system which
continuously supervises the software and the electronics of the relay. It handles
run-time fault situations and informs the user about an existing fault via a LED on
the HMI and a text message on the LCD.
When a fault is detected, the relay will first try to eliminate it by restarting. Only
after the fault has been found to be permanent, the READY indicator LED will start
to blink and the self-supervision output contact will be activated. All other output
contacts are blocked during an internal fault. Further, a fault indication message will
appear on the LCD.
Fault indications have the highest priority on the HMI. None of the other HMI
indications can override the IRF indication. As long as the READY indicator LED
is blinking, the fault indication can not be cleared. In case an internal fault
disappears, the READY indicator LED will stop blinking and the IRF relay will be
returned to the normal service state, but the fault indication message will remain on
the LCD.
The IRF code is the code of the last internal fault detected by the self-supervision
system and describes the type of fault. When a fault appears, the code is to be
recorded and given to an authorised repair shop when overhaul is ordered. For fault
codes, refer to the Operator’s Manual.
4.1.12. Relay parameterization
Local parameterization
The parameters of the relay can be set either locally via the HMI or externally via
serial communication with the Relay Setting Tool. When the parameters are set
locally, the setting parameters can be chosen via the hierarchical menu structure.
The desired language can be selected for the parameter descriptions. Refer to the
Operator’s Manual for further information.
External parameterization
The Relay Setting Tool is used for parameterizing the relay units. Adjusting the
parameter values using the Relay Setting Tool is done off-line, after which the
parameters can be downloaded to the relay via a communication port.
Table 4.1.10.4-10 Outputs
Operation of output contacts
State of output
(R, W, P)
Recorded
functions (R)
Value
Output PO1 O9 O29 0 or 1
Output PO2 O10 O30 0 or 1
Output SO1 O11 O31 0 or 1
Output SO2 O12 O32 0 or 1
Enabling output contacts PO1,
PO2, SO1 and SO2
O41 - 0 or 1