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 | | | | | | are within | |
 | | | | | | limits | |
 | |.Open | | |.GCR |.Turns off vol-| |
 | | | | | trip| tage regulator| |
 | | | | | GLC | | |
 | | | | | open| | |
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R  **ON A/C 401-499, 
R  A. Generator Control Unit 
R  The 2 GCUs are identical and interchangeable. The GCU functions (GCU1 and 
R  GCU2) are selected by Pin Programming. 
R  The GCU has four different functions: 
R  - voltage regulation, 
R  - frequency regulation, 
R  - control and protection of the network and the generator, 
R  - control of the various indications, 
R  - system test and self-monitoring. 
R  All these functions are performed in the digital form. 
R  The GCUs are supplied: 
R  - directly from the PMG, for generator excitation and 28VDC internal and 
R  external supply, 
R  - from the aircraft normal network (28 VDC) for the internal and external 
R  supply. 
R  This dual supply constitutes a back up supply. 
R  (1) Voltage regulation 
R  The voltage regulation is achieved by controlling the current through 
R  the exciter field. The voltage is kept at nominal value (115 VAC) at 
R  the Point of Regulation (POR). 
R  The POR is located in the electrical power centre (120VU) at the end 
R  of the generator feeder, upstream of the line contactor. 
R  The principle of operation of the voltage regulator is by constant 
R  frequency variable pulse width modulation of the voltage through the 
R  exciter field. 
R  (2) Regulation of the generator speed 
R  The regulation of the generator speed is accomplished by means of a 
R  servo valve located in the IDG. The GCU controls the servo valve 
R  position. The operating principle is detailled in Ref. 24-21-00.

 

R  (3) Control and protective functions 
R  The GCU controls the connection and disconnection of the power 
R  provided by the generator to and from the aircraft electrical system. 
R  This control is provided by means of 3 relays: 
R  - the Generator Control Relay (GCR) which controls the generator 
R  excitation, 
R  - the Power Ready Relay (PRR) which controls the generator line 
R  contactor and the FAULT warning light in the cockpit, 
R  - the Servo Valve Relay (SRV) which controls the generator speed by 
R  means of the servo valve. 
R  (4) Generator control and protection functions 
R  The following control or fault signals cause generator shutdown or 
R  de-energization: 
R  - No controlled Shutdown recognized upon power-up of the control unit 
R  - Overvoltage Fault 
R  - Undervoltage 1 Fault 
R  - Undervoltage 2 Fault 
R  - Overfrequency 1 Fault 
R  - Overfrequency 2 Fault 
R  - Overfrequency 3 Fault 
R  - Underfrequency 1 Fault 
R  - Underfrequency 2 Fault 
R  - Underspeed 
R  - Shorted Rotating Diode (PMG to chassis short) Fault 
R  - Open Cable Fault 
R  - Differential Protection Fault 
R  - Overcurrent Fault 
R  - Delta Overcurrent Fault 
R  - Phase Sequence Fault with the Power Ready Relay "absent" 
R  - Servo Valve Deterioration Fault 
R  - Disconnect Trip Fault 
R  - Welded GLC Fault 
R  - GLC Control Circuit Fault 
R  - Shorted/Open PMG Fault with the Power Ready Relay "absent" 
R  - Pin Programming Error detected on GCU power-up. 
R  The generator shall be "reset" when the protective faults 
R  (identified above) are still not present and one of the following 
R  occurs: 
R  - Cold Start (which is defined as POWER-UP RESET or the application 
R  of 28 volts to the control unit) occurs, 
R  - Generator Control Switch (GCS) is toggled (OFF to ON). 
R  The following functions shall be limited to a total of 2 resets 
R  after which a cold start will be requuired for reset: 
R  - Overvoltage Fault 
　
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