Instruction manual

KRB-5377
76
Table 39-2 Operation indication 2
LCD Contact output
State State
Operation
Normal
operation
When picked up When activated
After
control
power is off
for at least
1 sec.
Terminal
No.
See Fig. 19
Normal
operation
When
activated
After
control
power is off
for at least
1 sec.
Control power
supply
Line side ground fault
protection
(REF)
–
□
05
–
□
17
ON OFF
Contact overheat
monitoring
(OH)
–
Normal
indication
○
1
□
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
–
Normal
indication
○
1
□
05
–
□
26
OFF
ON ○
3
OFF ○
4
Required
 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.