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A 737-300/400/500MAINTENANCE MANUAL
(2) S 424-091Install the current transformer mount, the current transformer and the ground bus bar angle as one assembly with wires attached.
(3) S 434-096Install the generator cooling air crossover duct.
(4) S 434-097Remove all tags that you attached and install all of the wires on the generator and exciter terminals. (a) Make sure that the wires and the terminal build-up are the same prior to the removal procedure. (b) Tighten the nuts on the exciter wire terminals to 20-25 in-lbs. (c) Tighten the nuts on the generator wire terminals to 115-125 in-lbs.
(5) S 434-098Install the generator and exciter terminal covers.
(6) S 434-099Install the APU (AMM 49-11-00/401).
(7) S 724-100Do a Test of the APU generator. (a) Close the generator field control relay (GCR). (b) Momentarily set the APU GEN switches on the P5-4 panel to ON.
CAUTION:_______ WHILE THE APU OPERATES, DO NOT SET THE "APU GEN" SWITCHES TO "ON" UNTIL YOU ARE SURE THAT THE PHASE SEQUENCE IS CORRECT. AN INCORRECT PHASE SEQUENCE WILL CAUSE MOTORS TO TURN IN THE OPPOSITE DIRECTION. THIS CAN CAUSE DAMAGE TO THE LOAD EQUIPMENT.
(c) (d) Start the APU (AMM 49-11-00/201). 1) Momentarily set the two APU GEN switches to OFF. 2) Push and hold the RESID VOLTS button. 3) Make sure the AC voltmeter shows 10 to 21 volts. 4) Release the RESID VOLTS button.Make sure the phase sequence is correct for the APU generator output voltage.
WARNING:_______ BE CAREFUL WHEN YOU ARE NEAR ENERGIZED ELECTRICAL EQUIPMENT. FOLLOW ALL OF THE PRECAUTIONS TO PREVENT SHORT CICUITS AND ELECTRICAL SHOCK TO PERSONEL. ELECTRICAL SHOCK CAN CAUSE INJURIES TO PERSONS AND DAMAGE TO EQUIPMENT.
1) Get access to the APU GEN BREAKER 1 found on the P6-11 panel (AMM 24-21-41/401).
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737-300/400/500MAINTENANCE MANUAL
2) Connect a phase sequence indicator to terminals A1 (phase A), A2 (phase B), A3 (phase C) of the generator breaker. 3) Make sure that the phase sequence is A-B-C.
NOTE: If the phase sequence is not correct, two output
____ wires are connected to the incorrect terminals.
(e)
If it is necessary, correct the phase sequence (WDM 24-21-31).
(f)
Do a check of the APU generator voltage output. 1) Set the AC meter selector switch on the forward overhead panel P5-13 to APU GEN. 2) Momentarily set the two APU GEN switches on the P5-4 panel
to ON. 3) Make sure that the APU GEN OFF BUS light goes off. 4) Make sure the AC voltmeter shows 110 - 125 volts. 5) Make sure the CPS FREQ meter shows:
GTCP85-129 APU; UNLOADED 405-410 Hz, LOADED 397-417 Hz. GTCP36-280 APU; UNLOADED 395-405 Hz, LOADED 395-405 Hz. APS2000 APU; UNLOADED 395-405 Hz, LOADED 395-405 Hz.
(g) Put the Airplane back in its usual condition. 1) Stop the APU (AMM 49-11-00/201).
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737-300/400/500MAINTENANCE MANUAL
TRANSFORMER RECTIFIER - REMOVAL/INSTALLATION
____________________________________________
1. General_______
A. This procedure contains two tasks for the transformer rectifier (refer to as T-R units).
(1)
The removal of the T-R units.
(2)
The installation of the T-R units.
B.
The T-R units are on the E3-1 rack in the E/E equipment compartment.
TASK 24-21-31-004-009
2. Transformer Rectifier Removal (Fig. 401)_____________________________
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