Blue Electric Pump - Control and Monitoring (Sheet 1/2) R Figure 010
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Blue Electric Pump - Control and Monitoring (Sheet 2/2) R Figure 011
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R Reservoir 2000GQ Figure 012
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R Electric Pump 2075GJ Figure 013
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The hydraulic pump is attached to the boost pump. It is of the variable-displacement, in-line type. The pump has seven pistons, each of which has a maximum displacement of 4.3 ml/rev (0.25 cu.in./rev). A moveable yoke controls the displacement of the pistons. A spool valve compensator controls the yoke and thus the displacement of the pump. Thus the output of the pump is made to be the same as the amount of fluid the system needs.
The performance of the electric pump assembly is as follows:
(1)
Electric motor
-power supply: 115/200 V AC 400 Hz,
-
current consumption (running): 45 A
-
current consumption (start-up): 138 A
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speed (under load): 7600 RPM,
-
speed (no load): 8000 RPM.
(2)
Hydraulic pump
-
delivery pressure at zero flow: 206 +3 -0 bar (2987 +43 -0 psi),
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delivery pressure at maximum flow of 32 l/min (8.45 USgal): 150 bar (2175 psi).
A temperature switch is installed in the electric motor. If the temperature of the motor increases to 162 deg. C (503 deg. F) the switch operates and sends signals to the overhead panel and ECAM.
C. Current Transformer 2706GJ R (Ref. Fig. 014)
The current transformer 2706GJ is installed in the avionics compartment. It operates together with the current unbalance detector 2707GJ to detect faults in the motor of the electric pump. It compares the flow of current in each of the three phases of the AC supply to the motor. If the current in one phase is different from the other two the unit sends a signal to the current unbalance detector.
It is possible to test the operation of the current transformer. The test is done together with the test of the current unbalance detector. The test is started with the test pushbutton on the current unbalance detector.
A 28 V DC supply of electrical power is necessary for operation of the unit.
R Current Transformer 2706GJ Figure 014
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D. Current Unbalance Detector 2707GJ R (Ref. Fig. 015)
The current unbalance detector 2707GJ is installed in the avionics compartment. The unit is a box which contains the necessary electrical circuits and components. The electrical connectors, test P/B and indicator light are installed on the top surface of the unit. The current unbalance detector operates together with the current transformer 2706GJ to give protection if there is a fault in the electrical pump motor. A 28 V DC supply is necessary for the unit to operate.
When there is a fault, the detector gets a signal from the current transformer. It uses this signal to stop the supply of power to relay 2705GJ and thus stop the motor. The indicator light comes on to show that the unit has operated (and stopped the motor). A time delay is included in the circuits of the detector. It stops operation of the unit if the unit gets an input signal for only a short time.
When the unit has operated, it stays in that condition until it is set again. This happens automatically when the supply of power to the unit is stopped (through operation of P/B switch 2704GJ) and then started again (and there is no fault signal from the current transformer).
It is possible to test the operation of the unit with the test P/B. When the P/B is operated, a signal, which is the same as a fault, is put into the current transformer. The two units then operate in the same way as when there is a real fault. The indicator light comes on to show that the units have operated correctly. The current unbalance detector has to be set again after the test.
**ON A/C 001-049, 051-058, 101-101,
E. Pulsation Dampener 2092GM
The pulsation dampener 2092GM is installed in the outlet line from the electric pump. It removes the pulses of pressure of the HP flow from the pump. The pulsation dampener consists of an empty metal sphere, with inlet and outlet connections on opposite sides.
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