EPMS Flashcards

1
Q

What components are on the hot battery bus?

A

MIK switch
Cold refuel panel
HPSM 1/2 CONT

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2
Q

Battery description

A

FNC
20 cells
12 min at 80%
24 Vdc 15 Amp

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3
Q

Battery components

A
Internal heater (-40 C operations / on at -10 rdy in 30min)
Heater temp sensor (overtemp protection)
Battery temp sensor (signal to charger / control rate of recharge)
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4
Q

When does GCU under frequency protection start?

A

Ground 365 - 380 Hz (2+/-1 sec)

Air 306 Hz (75% RPM)

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5
Q

When does GCU over current protection start?

A

235 amps +/-5 CCR is opened in 5-7 secs

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6
Q

What are the GCU protections?

A
Over voltage
Under voltage
Over current
Under frequency
Feeder fault
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7
Q

What does HPSM1 supply power to?

A

ELC1, CBP1, ECS1, FCR

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8
Q

What does HPSM2 supply power to?

A

ELC2, CBP2, ECS2, Control logic for battery charger

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9
Q

ELC components?

A

68020 processor board
2 I/O modules
3 SP controlled relays modules (mux fails - last commanded position)
PSU1 DC 5+-15 Vdc
PSU2 26 Vac ABC ref for FMC, SP1/2, WP1/2 StabSyncros, 10 Vac for ENG1/2 oil psi transducer and xmsn transducers, 10 Vdc for VCP and BPIA

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10
Q

Where is the external power module?

A

Behind the LMP

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11
Q

Where is the CB for external power (EXT PWR INTLK)?

A

Next to LMP

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12
Q

Where does GCU DC backup power come from?

A

GCU1 - CBP2 | GCU2 CPB1

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13
Q

When can you not do an EPMS IBIT?

A
Airborne
ENG start or override
APU start or stop
Manual generator trip
Fuel boost operation
Zeroize operation
XFEED operation
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14
Q

Battery only operations?

A

WBP1 + 2 are HPSM bus bars (hot)
HPSM1 = KBP01 (Cold Refuel) KBP02 (MIK) KBP10 (SP1 power)
HPSM2 = KBP10 (SP2 power)
KB101/201 (30amps) prevent the battery from powering HPSM until MIK in BATT
When HPSM is powered KB103/203 (50 amps) provide power to CBP1/2
KB102/202 (30 amps) provide 28 Vdc to WB3/4 in ELC1/2 design to trip in overcurrent condition
KD1D1 and KD2D1 block voltage to WD1 and WD2

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15
Q

Battery Bus nomenclature?

A

WB1 + WB2 = HSPM1/2 Bus
WB3 + WB4 = ELC1/2 Bus
WB5 + WB6 = CBP1/2 Bus

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16
Q

What does the battery charger do?

A

Maintains battery in charged state

Provides faults to SP

17
Q

MIK to BATT does what?

A

KB101/102 close - WB1/2 powered (HPSMs)
KB102/202 close - WB3/WB4 powered (ELCs)
KD1D1/D2 block power to DC bus