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MAINTENANCE MANUAL
Electrical Control - Component Location
Figure 1 (Sheet 1)
M21329
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MAINTENANCE MANUAL
Electrical Control Component Location
Figure 1 (Sheet 2)
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MAINTENANCE MANUAL
(2)
The main contacts are kept open by spring force. Only a momentary voltage is needed to the breaker coils to change position. No holding current is necessary. The breaker closes when 15.0 to 29.5-volts dc is applied to the breaker close coil. To trip (open) the main contacts, 15.0 to 29.5-volts dc are applied to the breaker trip coil. This returns the contacts to their original position. Spring force again keeps the main contacts open.
(3)
The left BTB, and left GCB are in left generator power panel P31. The right BTB, and right GCB are in right generator power panel P32. The APB is in APU/external power panel P34.
C. Electrical Systems Control Panel
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(1) Electrical systems control panel M10063 is on pilots' overhead panel P5. The M10063 panel contains switches controlling the ac power system: Two main generator control switches, one auxiliary generator control switch, two guarded generator drive disconnect switches, two bus tie breaker switches, two utility bus switches, and one external power switch. The panel also contains amber left and right BUS OFF lights for main ac bus status.
D. Generator Field and Hydraulic Control Panel
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(1) Generator field and hydraulic control panel M10191 is on right side panel P61. Along with hydraulic switches, the panel contains three field switches; one for each of the left, right and APU generators. A white FIELD OFF light is located in each switch.
3. Operation
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A. Functional Description
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(1) Generator Field Control Relay (GCR) Control (Fig. 2)
(a)
Each generator control unit (GCU) contains a GCR. The GCR connects dc power from a rectifier in the GCU to the field winding of the generator. Without the field current, no ac power is produced by the generator.
(b)
The GCU's work with the GEN CONT switches on the M10063 panel and the field switches on the M10191 panel to control the GCRs. The GEN CONT switches are push on/push off type, which latch in when on. When latched, an ON indicator in the switch is visible. The field switches are momentary action type, which do not latch in. Pushing a field switch once turns it on, pushing it again turns it off.
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MAINTENANCE MANUAL
L/R/APU GEN
28V DCCONT UNIT
BAT BUS 1 TRIP 1
OA
DRIVE DISC
DISCONNECT
L/R GEN
SOLENOID
OB
115V ACP6
OC LEFT BUS MAIN FIELD
CLOSEPMG
ON
L/R GEN DR AUXFIELD PWR BREAKER
EXCITER 1 1 OFF
OA OB OC
L/R GEN DRIVE SW AC METERS ON
FIRELEFT/RIGHT/APU GENERATORON WOFF
GEN CONTUNIT NORMAL
LIGHTING L/R/APU GEN
L/R/APU ENG FIRE SW
CONT SW LT
ELECT SYSTEM CONTROL PANEL
POWER
SUPPLY
GCB CONT
RELAY
TRIP SHORTED
WPOR
ROTATING
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