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MAINTENANCE MANUAL
Service Outlets Schematic
Figure 2
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GALLEYS - DESCRIPTION AND OPERATION
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1. General (Fig. 1)_______
A. The forward galley has one module (1A) located forward of the No. 1 right passenger door. The mid galley has one module (2B) located aft of the No. 2 right passenger door. The aft galley has one module (4B) which extends the full width of the passenger compartment just aft of the No. 4 passenger doors.
B. Galleys have facilities for stowing, preparing, and serving food and beverages.
GALLEY GALLEY G1A G2B
Galleys
Figure 1
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C. Electric load control units (ELCU) protect galley circuits against overcurrent, phase unbalance, and differential current. ELCU's have a main contactor, current transformers (CT), and sensing circuits. The main contactor stays closed until it receives an overcurrent or differential current signal. The main contactor will open when the galley bus switch is opened. The overcurrent signal comes from a sensing circuit and from the internal CT's, which trip the ELCU. The overcurrent sensing circuit has a time delay. A small overcurrent will take longer to trip the ELCU. The CT's sense phase current differences. If the phase current difference is large, the ELCU will trip. The internal CT's sense phase unbalance. The ELCU will trip when the difference between the highest and lowest phase current is large.
D. The ELCU's and galley load relays (GLR) are controlled by the bus power control unit (BPCU) to reduce loads in galley buses. Loads are reduced in two stages depending on the overload. If overload persists, the galley bus is totally de-energized. All GLR's are de-energized if a single source overloads during ground operations, or if single generator operation occurs during flight. ELCU's will de-energize if overload persists. Galley bus is reset by the UTILITY BUS switch.
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ELECTRIC LOAD CONTROL UNIT FWD GALLEY (G1A)
Forward Galley 1A Schematic
Figure 2
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28V DC RT SEC 1
P11
Mid-Aft Galley 2A Schematic Figure 3
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28V DC BUS LEFT
P11
Aft Galley 4B Schematic
Figure 4
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