InteliLite4 AMF20 Global Guide
121
Protection blocking
Engine and generator fixed protections are blocked during starting phases or Ready and Stop states. They
become unblocked once Maximal Stabilization Time (page 238) has elapsed or GCB is closed whichever
happens first.
Exceptions are:
Overspeed protection which has two limits defined via setpoints Overspeed Sd (page 244) and Starting
Overspeed Sd (page 244). Starting Overspeed limit is considered in the starting phase till Starting
Overspeed Time elapses. This time starts to count once the RPM exceeds the value of Starting RPM
(page 227).
E-Stop and Emergency stop
The other way fixed protections can be blocked is by active LBI SD OVERRIDE (PAGE 460).
Note: LBI SD OVERRIDE (PAGE 460) (Shutdown Override) does not block evaluation of fixed protection
conditions and their visualization. They are recorded into alarm list or history. It only blocks their actions.
Shutdown Override blocks all level 2 (Sd, BOC) fixed protection. It does not block level 1 (Wrn, AHI, Hist) or
protection of type Sd Override.
Some generators or engine protections have an option to DISABLE the protection.
The setting is done by using the setpoint which is associated to the fixed protection. Each setpoint offers
these options.
Options Description
Enable Protection is enabled
Disable Protection is blocked
ExtDisable Disabling of the protection can be forced by LBI PROTECTION FORCE DISABLE (PAGE 455)
Setpoint options
Generator and engine protections lists
Alarms / Protection name
Current
BOC Short Circuit (page 572)
BOC Overcurrent IDMT (page 573)
BOC Current Unbalance (page 572)
Frequency
BOC Generator Overfrequency (page 568)
BOC Generator Underfrequency (page 568)
Others
ALI Gen Ph L1 Inverted (page 548)
ALI Gen Ph L2 Inverted (page 549)
ALI Gen Ph L3 Inverted (page 549)
ALI Gen Ph Rotation Opposite (page 549)
Power BOC Overload (page 572)
Generator protections
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