KRB-5404
78
Table 39-2 Operation indication 2
Operation
LCD
Contact output
Con
tr
o
l p
o
we
r
su
p
p
ly
State
Terminal
No.
See Fig. 19
State
Normal
operation
When picked up
When activated
After
control
power is off
for at least
1 sec.
Normal
operation
When
activated
After
control
power is off
for at least
1 sec.
Line side ground fault
protection
(REF)
Normal
indication
–
Normal
indication
○
1
□
05
–
□
17
OFF
ON
OFF
Req
u
ir
e
d
Contact overheat
monitoring
(OH)
–
□
05
–
□
17
ON
OFF
Pretrip alarm (PTA)
Normal
indication
○
1
○
2
□
05
–
□
06
ON
○
2
OFF
Pretrip alarm 2
(PTA2)
Normal
indication
○
1
○
2
□
05
–
□
27
ON
○
2
OFF
Undervoltage alarm
(UV)
–
Normal
indication
○
1
○
2
□
05
–
□
27
ON
○
2
OFF
System alarm
–
Normal
indication
○
1
□
05
–
□
26
ON
○
3
OFF
○
4
The ACB can be opened, closed or tripped, irrespective of whether or not the operation indication is reset.
The operation indication is updated when a protective function is activated.
means flashing
○
1
The event log is not cleared.
○
2
The alarm is self-recovered when the fault current decreases to less than the setting.
○
3
"SYS1" means disconnection of the magnet hold trigger (MHT) and "SYS2" does a tripping failure (incorrect operating time, mechanical malfunction etc).
○
4
The OCR has a self-monitoring feature that monitors the OCR internal circuit, the magnet hold tripper (MHT) circuit, and the ACB state. An alarm caused by transient noise can
be cleared or deleted. If such an alarm cannot be cleared, check the ACB. See chapter 7.
