EPCC/EOOW
Load Shed Stage 1
110% of GTG load for 100 miliseconds
Stator temp high
120 degrees Celcius
What is generator air temp high?
140 degrees
Low Generator LO pressure
15 PSI alarm (10 PSI shutdown)
When does the low paper alarm go off?
15 ft of paper
What is the normal cooldown period of a GTG?
15 minutes
What is high lube oil temp?
160 degrees
Tape drive high temp
165 degrees
How many summary alarms are there?
17
How many RPM is the GTG?
1800 GRPM
Load shed stage 2
2 seconds after stage 1 activates (affects ACs and VLS heater)
How mant casualty power terminals do switchboards and load centers have?
2, connected to generator side of circuit breaker
High bearing temp
210 degrees
High TIT alarm
2175 degrees
High TIT shutdown
2250 degrees
High module temp
250 degrees
High GTG vibs
3 mils for 3 seconds
When stop is pressed, how long must you wait before a start or motor?
3 minutes
Low generator reduction side shutdown
40 psi alarm (20 psi shutdown )
What is the high current alarm for each shore power breaker?
400 Amps
0 RPM
5th and 10th stage Bleed air opens Aux Lube oil pumps cycle for 15 seconds Starter engages Fuel manifold drain valve opens Fire damper opens Start over temp energized Slow start energized
Reduction ratio of GTG
7.967:1
What is the secondary purpose of the EPCC?
Processes data for DCC
What initiates bell log print?
AN/UYK 44
7500 RPM
Air assist panel deenergizes Ignition exciter off First diffuser bleed air valve closes
Perm APD mode
Allows manual paralleling of generators, provided permissives are met
AN/UYK 44
Processing computer for EOOW
Netcon 5000
Processing unit of LOCOP
What is fault current detect?
At 10000 amps and 59 hz across a closed breaker, opens all bus tie breakers and prevents closure of btbs
What two consoles receive info from EOOW?
BCU and CIC
Shore power load shed Stage 1
Causes stage 1 load shed when load reaches 3190 amps on any shore power breaker
Synchroscope meter
Compares frequency of selected power source to that of oncoming power source
GTG Governor mode switch
Controls speed/frequency
What are the different drive modes for the AN/USH 26?
DR 0, DR 1
12780 RPM
Diffuser, 5th and 10th stage bleed air closes Engine overspeed energizes
What does the EOOW do?
Displays status of equipment/processes data
Where can bell logs be printed from?
EOOW, BCU, PACC
Where are the EOOW plasma displays?
Eoow, BCU, CIC
T/F Module UV flame detectors will release halon
False
DROOP governor mode
Frequency varies based on load
2400 RPM
Fuel drain valve closes Fuel shutoff vlaves open Air assist panel energizes Ignition exciter on Fail to fire energized
Loss of Fuel
Fuel goes below 60 psi above 12225 RPM
What does FADC stand for?
Full authority digital control
GTG fire stop sequence
GTG shuts down Cooling Fan Stops Vent damper shuts 5th, 10th, 14th stage bleed air valves close Alarms go off
12225 RPM (Electronic run)
High vib circuit energizes Engine under speed energizes Engine over temp energizes Loss of fuel circuit energized
What are switchboard dead bus logics?
If SWBD is in local and power is lost, HP starts GTG of affected SWBD
When switching from droop to isoch, what happens to frequency?
Increases
Clockwise synchroscope rotation
Indicates oncoming power source is at a higher rotation
Counterclockwise synchroscope rotation
Indicates oncoming power source is at a lower rotation
Where is the speed temperature box and transient load sensor located?
LOCOP
Icing Condition
Less than 40 degrees greater than 70% humidity
What does DROOP mode disable?
Load sharing
AN/USH 26 tape drive unit
Loads bubble memory and logs data
Switch board out of limit voltage
Low: 428 VAC High: 472 VAC
SWBD out of limit frequency
Low: 58.3 hz High 61.7 hz
ISO governer mode
Maintains frequency regardless of load
Can shore power breakers be closed from EPCC?
No, only locally
Run APD mode
Normal operating position of APD, allows for automatic paralling of Generators
14340 RPM
Normal operating speed
How do is a GTG start aborted?
Off button
DROOP voltage regulator
Output voltage varies depending on load of GTG
15000 RPM
Over speed alarm
15800 RPM
Over speed shutdown
Transient load sensors
Prevents engine stall due to sudden increase of loads. When sudden increase of 500KW is sensed, 14th stage bleed air closes
Circuit breaker selector switch
Selects breaker to be closed, provides interlock between breakers
What direction does the synchro scope rotate when shifting from ship to shore?
Slowly in the slow direction
How do you acknowledge CIC alarms?
Spacebar
Slow start shutdown
Speed doesn't reach 2400 rpm within 30 seconds after button push
Shore power load shed stage 2
Stage 2 load shed occurs if any shore power breaker exceeds 400 amps for 5 seconds. Number of cables x 400 amps =trip point
9100 RPM (Self sustaining speed)
Start air valve closes, starter disengages
When does 14th stage bleed air automatically close?
Starts to close at 2145 degrees, fully closes at 2175 degrees
Bubble Memory
Stores programs that process data, used only on start up
When is APD bypass used?
Sync monitor is inoperative Bringing a power source online from a dead bus When closing last BTB in a loop
Start Overtemp
TIT is higher than 1600-1725 degrees below 12225 RPM
Fail To Fire
TIT is less than 600 degrees within 10 seconds after reaching 2400 RPM
What happens when bleed air is extracted from 14th stage?
TIT raises by 100-150 degrees
What is an indication of post shutdown fire?
TIT stays above 400 after shutdown or raises to 400
Test APD mode
Tests APD, used for PMS
Generator breaker auto trip
Trips generator circuit breaker when fuel pressure drops below 150 psi
When is bubble memory accessed?
Upon start up of console
APD bypass/sync mon bypass
Used to bypass sync monitor
Diff Voltage Regulator
Uses Automatic voltage regulator to bring gtg to 450 VAC upon start
Manual voltage regulator
Voltage moves when switch moves (used for troubleshooting)
When does the AN/UYK initiate a bell log print?
When there is a change in control station Change in bridge order mode Change to shaft speed/pitch change BCU lever is moved to new order mode Every hour
What in the LOCOP controls frequency/speed?
Woodward governor