(2)
The three (L, R, and APU) GEN FIELD MANUAL RESET switches control the generator control relays (GCRs) (Ref 24-22-00). The white FIELD OFF light in the switch is on when the corresponding GCR is open.
(3)
The GEN DRIVE DISC switches on M10063 contain amber DRIVE lights to indicate integrated drive generator (IDG) failures. The DRIVE light comes on when: 1) IDG oil-out temperature reaches too high a value, or 2) internal IDG oil pressure is too low (Ref 24-11-00). Along with the DRIVE light, a (L or R) GEN DRIVE level C message appears on the EICAS display, if the corresponding engine is running. The EICAS message also causes an electric auto event in the EICAS system (Ref 31-41-00).
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M10063 - ELECTRICAL M10191 - GENERATOR FIELD AND SYSTEM CONTROL PANEL HYDRAULIC CONTROL PANEL
AC Generation Annunciation Component Location
Figure 1
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(4)
The BUS TIE switches control bus tie breaker operation (Ref 24-22-00). The amber ISLN light in the switch comes on when: 1) The BUS TIE switch is off (out position), or 2) the bus tie breaker has automatically been locked open due to a system protection function, such as a differential current fault (Ref 24-23-00). Along with the ISLN light, a (L or R) BUS ISOLATED level C message appears on the EICAS display.
(5)
Each main ac bus has an amber BUS OFF light on the M10063 panel. This light comes on when its associated main ac bus loses power. This occurs when the main bus generator circuit breaker (GCB) is open and:
(a)
The main bus tie breaker (BTB) is open; or
(b)
The main bus BTB is closed; the opposite bus BTB, external power contactor (EPC),and auxiliary power breaker (APB) are open; or
(c)
Both BTBs are closed; the opposite bus GCB, EPC, and APB are open.
(6)
Along with the BUS OFF light, a (L or R) AC BUS OFF level B message appears on the EICAS display.
(7)
The APU GEN CONT switch controls operation of the auxiliary power breaker (APB) (Ref 24-22-00). The amber OFF light in the switch is on when the APB is open and:
(a)
The APU GEN CONT switch is OFF (out position); or
(b)
The external power contactor (EPC) is open, and the APU is operating above 95 percent full speed.
(8)
Along with the amber OFF light in the APU GEN CONT switch, an APU GEN OFF message appears on the EICAS display. (The APU must be running, with the failure existing, for the EICAS message to appear.) This is a level C EICAS message.
(9)
The EXT PWR switch controls the external power contactor (EPC) (Ref 24-41-00). The white AVAIL light is on when external power of correct quality is available at the external power receptacle. The ON light is on when the EPC is closed.
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