EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH THE CARGO LOADER SYSTEM ú

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757
MAINTENANCE MANUAL

 (b)  For the aft compartment, power for the control circuit comes from the 28V DC GND HNDLG BUS through the AFT CARGO LOADER CONT circuit breaker on the P34 panel.
 (8)  
The cargo loader control circuit has a control switch, four control relays, and two limit switches.

 (a)  
The 115v ac power to the power drive motor comes from P34 panel through the CARGO LOADER MOTOR RELAY. The CARGO RETRACT INTERRUPT RELAY or the CARGO EXTEND INTERRUPT RELAY controls the CARGO LOADER MOTOR RELAY.

 (b)  
The CARGO LOADER limit switches control the INTERRUPT RELAYS. The CARGO EXTEND ENABLE RELAY controls the CARGO EXTEND INTERRUPT RELAY.

 (9)  
The cargo door must be fully open for the cargo loader to operate. If the door is not fully open, the CARGO COMPT LTS ENABLE RELAY interrupts the 28v dc power to the control circuit.

 (10)
 For the forward cargo compartment, when you put the CARGO LOADER CONTROL SWITCH in the LOAD position the modules extend. When module 3 gets to the CARGO LOADER EXTEND LIMIT SWITCH, the CARGO EXTEND INTERRUPT RELAY interrupts the power to the CARGO MOTOR RELAY. This removes the power from the power drive unit.

 (11)
 For the forward cargo compartment, when you put the CARGO LOADER CONTROL SWITCH in the UNLOAD position, the modules retract. When module 3 gets to the CARGO LOADER RETRACT LIMIT SWITCH, the CARGO RETRACT INTERRUPT RELAY deactivates the CARGO LOADER MOTOR RELAY. This removes the electrical power from the power drive unit.

 (12)
 For the aft cargo compartment, when you put the CARGO LOADER CONTROL SWITCH in the LOAD position, the modules extend. When module 2 gets to the CARGO LOADER EXTEND LIMIT SWITCH, the CARGO EXTEND INTERRUPT RELAY deactivates the CARGO LOADER MOTOR RELAY. This removes the electrical power from the power drive unit.

 (13)
 For the aft cargo compartment, when you put the CARGO LOADER CONTROL SWITCH in the UNLOAD position, the modules retract. When module 2 gets to the CARGO LOADER RETRACT LIMIT SWITCH, the CARGO RETRACT INTERRUPT RELAY activates. This deactivates the CARGO LOADER MOTOR RELAY and removes the electrical power from the power drive unit.

 (14)
 The CARGO LOADER LIMIT SWITCH ACTUATORS are magnets.  They are on module 3 in the forward cargo compartment, and on module 2 in the aft cargo compartment.

 (15)
 The CARGO LOADER EXTEND LIMIT SWITCH is a mechanical limit switch that is on the sidewall of the forward and aft cargo compartment. The trigger plate, on module 3 in the forward compartment or module 2 in the aft cargo compartment, operates the switch.

 (16)
 The CARGO LOADER RETRACT LIMIT SWITCH is a proximity sensor that is on the sidewall of the cargo compartment. The magnetic field from the CARGO LOADER LIMIT SWITCH ACTUATOR actuates the switch.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH THE CARGO LOADER SYSTEM ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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757
MAINTENANCE MANUAL

 B. Control
 (1)  
Put the CARGO LOADER CONTROL SWITCH in the LOAD position when you will load the modules. This will extend the modules.

 (2)  
Put the CARGO LOADER CONTROL SWITCH in the UNLOAD position when you will unload the modules. This will retract the modules.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH THE CARGO LOADER SYSTEM ú

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 ú ú 11 Page 8 ú Sep 28/99
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757 FAULT ISOLATION/MAINT MANUAL
CARGO LOADER SYSTEM
COMPONENT  SHT 102 FIG  QTY  ACCESS/AREA  REFERENCE 
　
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