R -------------------------------------------------------------------------------R CONTROLS/PROTECTIONS OF GCU TD EFFECTS R -------------------------------------------------------------------------------
R R R R R - Over/under voltage (OV/UV) - Over/under frequency (OF/UF) - Shorted PMG - Fast overspeed shutdown 3-5s 3-5s 3-5s 150ms
R **ON A/C ALL
R Post SB 24-1093 For A/C 051-052,
B. Generator Control Unit The GCU main functions are:
Line contactor opens, generator de-energization and control valve close (FAULT warning on RAT & EMER GEN warning light).
-
to control the servovalve excitation for speed regulation,
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to regulate the generator voltage by the field current,
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to protect the network and the generator by controlling the associated line contactor and generator field current.
-------------------------------------------------------------------------------CONTROLS/PROTECTIONS OF GCU | TIME DELAY | EFFECTS -------------------------------------------------------------------------------
- Over/Under Voltage (OV/UV) - Over Frequency (OF) - Under Frequency (UF) - Shorted PMG - Fast overspeed shutdown | | | | |
R **ON A/C ALL
5. Operation_________
3-5 S 3-5 S 300 mS 3-5 S 150 mS | Line contactor opens, generator| de-energization and control| valve close (FAULT warning on| RAT & EMER GEN warning light).|
A. Control and Indicating Circuits
(1) Emergency generator switching (Ref. Fig. 005, 006)
The emergency generator is switched through:
-
contactor 2XE ( emergency generator line contactor or EMER GLC), and
-
contactor 15XE (AC ESS BUS contactor).
-timer 33XE, it avoids the closure of the contactor 15XE in case of an electric transfer and close this contactor 15XE only in emergency configuration.
Electrical Emergency Switching - Schematic
Figure 005
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EMER & AC ESS BUS Contactors Control - Logic Diagram
Figure 006
1EFF : ALL 1 24-24-00Page 13 1 1 Feb 01/00R 1 1 1CES 1
The emergency generator has priority over its network and supplies
the essential busbars (4XP, 8XP, 4PP, 8PP).
Supply to the line contactor (EMER GLC) only depends on the
availability of the emergency generator.
Supply of section 1 of contactor 15XE depends on several conditions:
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the availability of the emergency generator,
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the failure of one of the 2 normal TR's (TR 1 or TR 2),
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the failure of the DC ESS BUS SUPPLY and/or DC NORM BUS 1 switching contactors (4PC/1PC1).
(2) RAT extension logic and CSM/G control logic
**ON A/C 001-049, 051-099, 101-105, 201-203,
(Ref. Fig. 007)
R **ON A/C 106-149, 151-199, 204-299, 301-399, 401-499,
(Ref. Fig. 007A)
**ON A/C ALL
(a) RAT extension logic 3 different logics control RAT extension:
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the automatic electrical logic: this energizes solenoid N..1 when there is loss of voltage at busbars 1XP and 2XP and speed V > 100 kts,
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the manual electrical logic: this energizes solenoid No. 2 directly, via OVRD ELEC pushbutton switch,
-
the manual hydraulic logic: this energizes solenoid No. 1 directly, via OVRD HYD pushbutton switch.
**ON A/C 001-049, 051-099, 101-105, 201-203,
(b) CSM/G control logic 3 different logics control energization of the emergency generation:
-
the automatic electrical logic: this is identical to that of the RAT extension, in the landing gear retracted configuration,
-
the manual electrical logic: this is identical to that of the RAT extension, in the landing gear retracted configuration,
RAT Extension Logic & CSM/G Control Logic - Schematic
Figure 007
R 1EFF : 001-049, 051-099, 101-105, 201-203, 1 24-24-00Page 15 1 1 May 01/05 1 1 1CES 1
RAT Extension Logic and CSM/G Control Logic - Schematic
Figure 007A
R 1EFF : 106-149, 151-199, 204-299, 301-399, 1 24-24-00Page 16 1401-499, 1Aug 01/05 1 1 1CES 1
- the electrical test logic: this simulates the automatic electrical logic because it allows the emergency generator to be coupled to the Blue hydraulic system (supplied by the hydraulic electric pump) while inhibiting RAT extension.
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