Maintenance; Regular Testing; Failure Tracing And Repair - Toshiba GRE110 Instruction Manual

• Stop pressing the ENTER key to reset the operation.
• Repeat the above for BO1, BO3 and BO4.

6.7 Maintenance

6.7.1 Regular Testing

The relay is almost completely self-supervised. The circuits that can not be supervised are binary
input and output circuits and human interfaces.
Therefore, regular testing is minimised to checking the unsupervised circuits. The test procedures
are the same as described in Sections 6.4.1, 6.4.2 and 6.4.3.

6.7.2 Failure Tracing and Repair

Failures will be detected by automatic supervision or regular testing.
When a failure is detected by supervision, a remote alarm is issued with the binary output relay of
FAIL and the failure is indicated on the front panel with LED indicators or LCD display. It is also
recorded in the event record.
Failures detected by supervision are traced by checking the "Err: " screen on the LCD. Table 6.7.1
shows LCD messages and failure locations.
The locations marked with (1) have a higher probability than locations marked with (2).
Message
Err: SUM
×(Flash memory)
Err: RAM
×(SRAM)
Err: BRAM ×(Backup RAM)
Err: EEP
×(EEPROM)
Err: A/D ×(A/D converter)
Err: CT* × (AC input circuit)(1)
Err: DRIVER
× (BI,BO circuit)(1)
Err: PLC
Err: CormRun
Err: Ping
Err: Map
Err: GOOSE
( ): Probable failure location in the relay unit including its peripheral circuits.
* ; In case CT supervision set the Error level.
Alarms detected by supervision are traced by checking the "ALM: " screen on the LCD. Table 6.7.2
shows LCD messages and alarm locations.
Table 6.7.1 LCD Message and Failure Location
Relay Unit AC cable
×
(2)
 174 
Failure location
CB or Cable PLC,IEC 61850 data
×
(2)
×(IEC61850 mapping data)
×(GOOSE subscribe)
6 F 2 T 0 1 7 2
×(PLC data)
×(Ethernet LAN)
×(Ping response)