DOC AIRBUS | AMM A320FYELLOW AUXILIARY HYDRAULIC POWER - DESCRIPTION AND OPERATION
** ON A/C NOT FOR ALL
** ON A/C NOT FOR ALL
1. General
The Yellow auxiliary generation system supplies hydraulic power for operation of all components in the Yellow system. The system has an electric pump which provides the auxiliary hydraulic power. One task of the system is the operation of the forward and aft cargo doors. The system can also provide Green hydraulic power through the power transfer unit.
The Yellow system hand pump provides hydraulic power for operation of the forward and aft cargo doors. The data about the hand pump is contained in 52-36-00.
** ON A/C NOT FOR ALL The Yellow auxiliary generation system supplies hydraulic power for operation of all components in the Yellow system. The system has an electric pump which provides the auxiliary hydraulic power. One task of the system is the operation of the forward and aft cargo doors. The system can also provide Green hydraulic power through the power transfer unit.
The Yellow system hand pump provides hydraulic power for operation of the forward and aft cargo doors. The data about the hand pump is contained in 52-36-00.
2. Component Location
Component Location
Component Location ** ON A/C NOT FOR ALL
Component Location ** ON A/C NOT FOR ALL
** ON A/C NOT FOR ALL Component Location Component Location ** ON A/C NOT FOR ALL Component Location ** ON A/C NOT FOR ALL | FIN | FUNCTIONAL DESIGNATION | PANEL | ZONE | ACCESS DOOR | ATA REF |
|---|---|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||||
| 3075GX | PACKAGE E-PUMP | 196BB | 196 | 29-24-51 | |
| ** ON A/C ALL | |||||
| 3009GM | CARGO DOOR HAND PUMP | 198CB | 198 | 52-36-11 | |
| ** ON A/C NOT FOR ALL | |||||
| 3075GX | PACKAGE E-PUMP | 196 | 29-24-51 | ||
| ** ON A/C ALL | |||||
| 3270GM | HAND PUMP LEVER | 198CB | 198 | 27-20-00 | |
| 3807GX | CURRENT TRANSFORMER | 122 | 29-24-15 | ||
| 3808GX | CURRENT UNBAL.DETECT. | 122 | 29-24-16 | ||
3. System Description
The electric pump provides hydraulic pressure for the auxiliary generation system. It is installed in the Yellow hydraulic bay. The pushbutton switch (3804GX) on the overhead panel controls the operation of the electric pump.
The electric hydraulic pump supplies hydraulic pressure to the right thrust reverser and the High-Pressure (HP) manifold. A hand pump is installed on the ground service panel of the Yellow system. It supplies pressure to the forward and aft cargo-compartment doors (through the selector valve).
The system has a current transformer (3807GX) and a phase unbalance detector (3808GX) which protect the electric circuit of the electric pump. The current transformer and the phase unbalance detector are installed on panel 107VU.
** ON A/C NOT FOR ALL The electric pump provides hydraulic pressure for the auxiliary generation system. It is installed in the Yellow hydraulic bay. The pushbutton switch (3804GX) on the overhead panel controls the operation of the electric pump.
The electric hydraulic pump supplies hydraulic pressure to the right thrust reverser and the High-Pressure (HP) manifold. A hand pump is installed on the ground service panel of the Yellow system. It supplies pressure to the forward and aft cargo-compartment doors (through the selector valve).
The system has a current transformer (3807GX) and a phase unbalance detector (3808GX) which protect the electric circuit of the electric pump. The current transformer and the phase unbalance detector are installed on panel 107VU.
4. Power Supply
The power supply for the electric pump is three-phase, 115 V AC. It comes from either AC bus 2 2XP or external supply.
Two contactors are installed in the system. One contactor is connected to the supply line from the AC bus supply, the other is connected to the supply line from the external power supply. The two contactors are connected to each other by shunts. Operation of the contactors controls the supply of electrical power to the electric pump.
A current transformer monitors the current supplied to the electric pump. It transmits this data to the phase unbalance detector. In the event of phase unbalance, the detector unit signals the contactors to open. Thus, the supply of electrical power to the electric pump stops.
** ON A/C NOT FOR ALL The power supply for the electric pump is three-phase, 115 V AC. It comes from either AC bus 2 2XP or external supply.
Two contactors are installed in the system. One contactor is connected to the supply line from the AC bus supply, the other is connected to the supply line from the external power supply. The two contactors are connected to each other by shunts. Operation of the contactors controls the supply of electrical power to the electric pump.
A current transformer monitors the current supplied to the electric pump. It transmits this data to the phase unbalance detector. In the event of phase unbalance, the detector unit signals the contactors to open. Thus, the supply of electrical power to the electric pump stops.
5. Component Description
A. Electric Pump 3075GX FIN: 3075-GX
The electric pump is installed in the Yellow hydraulic bay. The pump includes:
The electric motor is a conventional induction motor. It operates with a three- phase electric supply of 115 V AC, 400 Hz. It has a blower assembly to help the motor stay cool.
A temperature switch is installed in the electric motor. If the temperature increases to 162 deg. C (503 deg. F) the switch operates and sends signals to the overhead panel and to the ECAM.
The boost pump is a centrifugal type impeller. It raises the fluid pressure by a nominal 2.1 bar (30 psi) relative to the inlet pressure.
The hydraulic pump is of the variable-displacement inline type. It has seven pistons. A spool valve compensator controls the displacement of the pump through a yoke and yoke actuating piston.
Performance:
The electric pump is installed in the Yellow hydraulic bay. The pump includes:
- an electric motor
- a boost pump
- a hydraulic pump.
The electric motor is a conventional induction motor. It operates with a three- phase electric supply of 115 V AC, 400 Hz. It has a blower assembly to help the motor stay cool.
A temperature switch is installed in the electric motor. If the temperature increases to 162 deg. C (503 deg. F) the switch operates and sends signals to the overhead panel and to the ECAM.
The boost pump is a centrifugal type impeller. It raises the fluid pressure by a nominal 2.1 bar (30 psi) relative to the inlet pressure.
The hydraulic pump is of the variable-displacement inline type. It has seven pistons. A spool valve compensator controls the displacement of the pump through a yoke and yoke actuating piston.
Performance:
- displacement = 4.3 ml/rev.
- delivery pressure at zero flow = 206 + 3 - 0 bar (2987 + 43.5 - 0 psi)
- delivery pressure at 23 l/min (6.08 US gal/min) = 196 bar (2842 psi)
- delivery pressure at 32 l/min (8.45 US gal/min) = 150 bar (2175 psi)
B. Hand Pump 3009GM
Description of the hand pump is given in 52-36-00.
Description of the hand pump is given in 52-36-00.
6. Operation
The operation of the pushbutton switch (P/BSW) 3804GX on the overhead panel 40VU controls the electric pump. When the P/BSW is pushed and released, the ON light comes on and the electric pump starts. At the same time, the lower display unit (DU) of the ECAM shows the operation of the pump (if the HYD page is selected). It is also possible to start the electric pump from the cargo door operating panel (Ref. AMM D/O 52-35-00-00). In this case, the time relay 6MJ is energized from the cargo door system to start the electric pump. The cargo door system gets a supply of hydraulic power.
The pump gets its supply of fluid from the reservoir of the Yellow hydraulic system and pressurizes the system to a nominal pressure of 206 bar (3000 psi). The pump automatically changes its output to agree with the demands of the system. When the outlet pressure changes, the compensator moves the yoke plate by movement of the actuator. This increases or decreases the stroke of the pistons and thus controls the output of the pump. Some inlet fluid goes through the hollow drive shaft of the motor to keep the bearings and rotor cool.
The output from the electric pump goes to the RH thrust reverser and to the high pressure (HP) manifold. From the HP manifold, the supply is sent to all of the services which include the cargo doors.
The current transformer 3807GX and the phase unbalance detector 3808GX together monitor the operation of the electric motor. If there is a difference in the current flow of the three phases of the supply to the motor, the current transformer sends a signal. This signal goes to the phase unbalance detector. The phase unbalance detector then sends signals to the contactors 3805GX and 3806GX to cause them to open. This stops the supply of electrical power to the motor. At the same time, signals are sent to the ECAM and to the overhead panel.
If the motor of the electric pump overheats, the temperature switch in the motor sends signals to the ECAM and overhead panel. The message "ELEC OVHT" comes into view on the ECAM lower DU and the YELLOW ELEC PUMP/FAULT light comes on. The applicable messages comes into view on the STATUS page of the ECAM upper DU. If the temperature decreases, the warnings stop and a message on the STATUS page gives the information that the electric pump is available.
The operation of the pushbutton switch (P/BSW) 3804GX on the overhead panel 40VU controls the electric pump. When the P/BSW is pushed and released, the ON light comes on and the electric pump starts. At the same time, the lower display unit (DU) of the ECAM shows the operation of the pump (if the HYD page is selected). It is also possible to start the electric pump from the cargo door operating panel (Ref. AMM D/O 52-35-00-00). In this case, the time relay 6MJ is energized from the cargo door system to start the electric pump. The cargo door system gets a supply of hydraulic power.
The pump gets its supply of fluid from the reservoir of the Yellow hydraulic system and pressurizes the system to a nominal pressure of 206 bar (3000 psi). The pump automatically changes its output to agree with the demands of the system. When the outlet pressure changes, the compensator moves the yoke plate by movement of the actuator. This increases or decreases the stroke of the pistons and thus controls the output of the pump. Some inlet fluid goes through the hollow drive shaft of the motor to keep the bearings and rotor cool.
The output from the electric pump goes to the RH thrust reverser and to the high pressure (HP) manifold. From the HP manifold, the supply is sent to all of the services which include the cargo doors.
The current transformer 3807GX and the phase unbalance detector 3808GX together monitor the operation of the electric motor. If there is a difference in the current flow of the three phases of the supply to the motor, the current transformer sends a signal. This signal goes to the phase unbalance detector. The phase unbalance detector then sends signals to the contactors 3805GX and 3806GX to cause them to open. This stops the supply of electrical power to the motor. At the same time, signals are sent to the ECAM and to the overhead panel.
If the motor of the electric pump overheats, the temperature switch in the motor sends signals to the ECAM and overhead panel. The message "ELEC OVHT" comes into view on the ECAM lower DU and the YELLOW ELEC PUMP/FAULT light comes on. The applicable messages comes into view on the STATUS page of the ECAM upper DU. If the temperature decreases, the warnings stop and a message on the STATUS page gives the information that the electric pump is available.