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 C.  External Power Receptacle_________________________
 (1)  The external power receptacle (EPR) connects 115-volt, 3-phase, 400-Hz AC power to the airplane's electrical system. The receptacle has six pins. Four pins are used to transfer the AC power, and two complete a DC interlock with the BPCU. The external power receptacle is located in the P30 panel.
 D.  External Power Contactor________________________
 (1)  
The external power contactor (EPC) is an electrically held, 115-volt, 3 phase, 400-Hz unit. When energized, the EPC connects external power to the AC tie bus. The EPC is energized by the BPCU, from a flight compartment switch command. Twenty-eight volts DC energize the contactor. The EPC is rated to operate continuously with a current of 275 amps/phase. Protective functions in the BPCU can de-energize the EPC automatically.

 (2)  
Six terminal studs connect external power to the EPC. Control is provided by a separate electrical connector. The EPC is in APU/external power panel P34.

 E.  Ground Power Current Transformer________________________________
 (1)  The ground power current transformer (GPCT) senses current flow in each of the external power feeders. The external power current is monitored by the BPCU. The GPCT is located in P34 panel.
Operation (Fig. 2)
_________
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A

757 MAINTENANCE MANUAL
ELECTRICAL

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ELECTRICAL SYSTEM CONTROL PANEL

External Power - Component Location
Figure 1 (Sheet 1)

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A
757
MAINTENANCE MANUAL

EXTERNAL POWER PANEL, P30

External Power - Component Location
Figure 1 (Sheet 2)

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757
MAINTENANCE MANUAL

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115V AC
OVERWHEN EXT
CURRENTPOWER
SENSINGPLUG ISATTACHED
WATCH DOGCIRCUITPOWER
JUMPER SUPPLY
OVER VOLTAGEOF EXT(PARTEP INTERLOCK
VOLT>129VPWR
GND PWR CT UNDER VOLTAGE
PLUG) EP INTERLOCK VOLT<107V
EXT PWR
RCPT
W
AC METERS
MD&T
AC CONNECTED LT
EXT PWRW
POWER NOT  APU
IN USE LT GND SVCE XFERRLY
EXT POWER RECPT PANEL
TRIP
FREQUENCY SENSE OVER FREQ
UNDER FREQ
<372.5HZ
<350
HZ
>427.5
HZ
>440
HZ
AC OPEN PHASETIE DETECTIONBUS EXT PWR BUS
EXT PWR TIE DPCT
BPCU (P34)
R
L GEN CONT UNIT

L GEN CONT UNIT
ON W
HOT BUS

LBTB R GEN CONT UNIT
R GEN CONT UNIT  WARNINGLIGHT
OLAP
Q L BUS TIE
　
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