6 F 2 T 0 1 7 2
The LCD messages are shown on the "Auto-supervision" screen, which is displayed automatically
when a failure is detected or displayed by pressing
▼
key. The event record messages are shown
on the "Event record" screen by opening the "Record" sub-menu.
The alarms are retained until the failure is recovered.
The alarms can be disabled collectively by setting the scheme switch [A.M.F.] to "OFF". The
setting is used to block unnecessary alarms during commissioning, test or maintenance.
When the Watchdog Timer detects that the software is not running normally, LCD display and
event recording of the failure may not function normally.
Table 3.3.1 Supervision Items and Alarms
Supervision Item
LCD
Message
LED
"IN SERVICE"
LED
"ALARM"
LED
"Relay fail"
Event record Message
AC input imbalance
monitoring
Err: CT
On/Off (2)
On
(4)
CT err
(2)
Relay fail or Relay fail-A
A/D accuracy check
(1)
Off
On
(4)
Relay fail
Memory monitoring
Watchdog Timer
----
Off
On
(4)
----
Power supply monitoring
Err: DC
Off
(3)
Off
Relay fail-A
Trip circuit supervision
Err:TC
On
On
Off
TC err, Relay fail-A
CB state monitoring
Err:CB
On
On
Off
CB err, Relay fail-A
CB condition monitoring
Trip count alarm
ALM:TP
COUNT
On
On
Off
TP COUNT ALM,
Relay fail-A
Operating time alarm
ALM: OP
time
On
On
Off
OP time ALM, Relay fail-A
∑
I
y
count alarm
ALM:
∑
IY
On
On
Off
∑
IY-A ALM,
∑
IY-B ALM or
∑
IY-C ALM, Relay fail-A
(1): Diverse messages are provided as expressed with " Err:---" in the table in Section 6.7.2.
(2): The LED is on when the scheme switch [SVCNT] is set to "ALM" and off when set to "ALM &
BLK" (refer to Section 3.3.6). The message "Relay fail-A" is recorded when the scheme switch
[SVCNT] is set to "ALM". This monitoring is NOT for models 820 and 821.
(3): Whether the LED is lit or not depends on the degree of the voltage drop.
(4): The binary output relay "FAIL" operates except for DC supply fail condition.
3.3.6 Trip Blocking
When a failure is detected by the following supervision items, the trip function is blocked as long as
the failure exists, and is restored when the failure is removed.
•
A/D accuracy check
•
Memory monitoring
•
Watchdog Timer
When a fault is detected by the AC input imbalance monitoring, the scheme switch [SVCNT]
setting can be used to determine if both tripping is blocked and an alarm is output (ALM&BLK), or
if only an alarm is output (ALM).
74
Summary of Contents for GRE110
Page 183: ...6 F 2 T 0 1 7 2 Appendix B Signal List 184 ...
Page 191: ...6 F 2 T 0 1 7 2 Appendix C Event Record Items 192 ...
Page 196: ...6 F 2 T 0 1 7 2 Appendix D Binary Output Default Setting List 197 ...
Page 199: ...6 F 2 T 0 1 7 2 Appendix E Relay Menu Tree 200 ...
Page 210: ...6 F 2 T 0 1 7 2 Appendix F Case Outline 211 ...
Page 211: ...6 F 2 T 0 1 7 2 Case Outline for model 400 401 420 421 820 and 821 212 ...
Page 212: ...6 F 2 T 0 1 7 2 Case Outline for model 402 and 422 213 ...
Page 213: ...6 F 2 T 0 1 7 2 Appendix G Typical External Connection 214 ...
Page 245: ...6 F 2 T 0 1 7 2 Appendix J Return Repair Form 246 ...
Page 249: ...6 F 2 T 0 1 7 2 Customer Name Company Name Address Telephone No Facsimile No Signature 250 ...
Page 250: ...6 F 2 T 0 1 7 2 Appendix K Technical Data 251 ...
Page 256: ...6 F 2 T 0 1 7 2 Appendix L Symbols Used in Scheme Logic 257 ...
Page 259: ...6 F 2 T 0 1 7 2 Appendix M Modbus Interoperability 260 ...
Page 289: ...6 F 2 T 0 1 7 2 Appendix N IEC60870 5 103 Interoperability 290 ...
Page 296: ...6 F 2 T 0 1 7 2 Appendix O PLC Default setting 297 ...
Page 298: ...6 F 2 T 0 1 7 2 Appendix P Inverse Time Characteristics 299 ...
Page 304: ...6 F 2 T 0 1 7 2 Appendix Q IEC61850 Interoperability 305 ...