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R  - the Power Ready Relay (PRR) which controls the generator line 
R  contactor and the FAULT warning light in the cockpit. 
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  - Underfrequency 1 Fault 
R  - Underfrequency 2 Fault 
R  - SRD/PMG to Chassis Short Fault 
R  - Differential Protection Fault 
R  - Overcurrent Fault 
R  - Fire switch Fault 
R  - Phase Sequence Fault with the Power Ready Relay "absent" 
R  - AGC Control Circuit Fault 
R  - AGC welded Fault 
R  - Shorted/Open PMG Fault with the Power Ready Relay "absent" 
R  - Pin Programming 
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 required for reset: 
R  - Overvoltage Fault 
R  - Overfrequency 2 Fault 

R 1EFF : 401-499, 1 24-23-00Page 17 1 1 Aug 01/05 1 1 1CES 1

R  - Differential Protection TD Fault 
R  - Overcurrent Fault 
R  - AGC Welded Fault 
R  A table listing all these functions is shown below. 
R  GAPCU DETECTION: 
R  -------------------------------------------------------------------------------
R  | FUNCTION | SENSING | THRESHOLD | TIME DELAY | TRIPS | 
R  |------------------|-------------|--------------|-----------------|-----------| 
R  | Overvoltage (OV) | Highest POR | 130 +/- 1.5V | Inverse Curve | GCR, PRR | 
R  | | phase | | (max) | | 
R  |------------------|-------------|--------------|-----------------|-----------| 
R  | Undervoltage | | | | GCR, PRR | 
R  | (UV1) | Lowest POR |101.5 +/- 1.5V| 4.5 seconds | | 
R  | | phase |4V Hysteresis | (max) | | 
R  | (UV2) | Lowest POR | 68 +/- 1.5V | 160 milliseconds| | 
R  | | |4V Hysteresis | (max) | | 
R  |------------------|-------------|--------------|-----------------|-----------| 
R  | Overfrequency | | | | GCR, PRR, | 
R  | (OF1) | PMG | 435 +/- 1 Hz | 4.0 seconds | SVS | 
R  | | |4Hz Hysteresis| (max) | | 
R  | (OF2) | PMG | 452 +/- 1 Hz | 160 milliseconds| | 
R  | | |4Hz Hysteresis| (max) | | 
R  |------------------|-------------|--------------|-----------------|-----------| 
R  | Underfrequency | | | | GCR, PRR | 
R  | (UF1) | PMG | 361 +/- 1 Hz | 4.0 seconds | | 
R  | | |4Hz Hysteresis| (max) | | 
R  | (UF2) | PMG | 343 +/- 1 Hz | 160 milliseconds| | 
R  | | |4Hz Hysteresis| (max) | | 
R  |------------------|-------------|--------------|-----------------|-----------| 
R  | Underspeed (US) | Gnd signal | Discrete | 80 milliseconds | PRR | 
R  | APU (RDY) | from | Input | (max) | | 
R  | | APU ECB | | | | 
R  |------------------|-------------|--------------|-----------------|-----------| 
R  | Shorted Rotating |Exciter Field| > 175 VDC | 3 seconds (max) | GCR, PRR | 
R  | Diode (SRD) | Current vs. | Rippled | | | 
R  | | Load | detected | | | 
R  | | Current | | | | 
R  | | Voltage | | | | 
R  |------------------|-------------|--------------|-----------------|-----------| 
R  | Differential | Generator |50 +/- 10 A | 60 milliseconds | GCR, PRR | 
R  | Protection (DP) | and Line | | (max) | | 
R  | | CT delta for| | | | 
R  | | each phase | | | | 
R  | | measurement | | | | 
R  |------------------|-------------|--------------|-----------------|-----------| 
R  | Overcurrent (OC) | Generator | APU Imax | Inverse Curve | GCR, PRR |
　
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