R 1EFF : 401-499, 1 24-22-00Page 32 1 1 Aug 01/05 1 1 1CES 1

R  - Overcurrent 2 Fault 
R  - Servo Valve Deterioration Fault 
R  - Welded GLC Fault 
R  - GLC Control Circuit Fault 
R  A table listing all these functions is shown below. 
R  GCU DETECTION: 
R  -------------------------------------------------------------------------------
R  | FUNCTION | SENSING | THRESHOLD | TIME DELAY | TRIPS | 
R  |------------------|-------------|--------------|-----------------|-----------| 
R  | Overvoltage (OV) | Highest POR | 130 +/- 1.5V | Inverse Curve | GCR, PRR | 
R  | | phase | | TD (max) | | 
R  |------------------|-------------|--------------|-----------------|-----------| 
R  | Undervoltage | Lowest POR | | | GCR, PRR | 
R  | (UV1) | phase |101.5 +/- 1.5V| 4.5 seconds | | 
R  | | |4V Hysteresis | (max) (UV1) | | 
R  | (UV2) | | 68 +/- 1.5V | 160 milliseconds| | 
R  | | |4V Hysteresis | (max) | | 
R  |------------------|-------------|--------------|-----------------|-----------| 
R  | Overfrequency | | | | GCR, PRR, | 
R  | (OF1) | POR equiv | 435 +/- 1 Hz | 4.0 seconds | SVS | 
R  | | (PMG) |4Hz Hysteresis| (max) | | 
R  | (OF2) | POR equiv | 452 +/- 1 Hz | 160 milliseconds| | 
R  | | (PMG) |4Hz Hysteresis| (max) | | 
R  | (OF3) | POR equiv | 457 +/- 2 Hz | 10 milliseconds | | 
R  | | (PMG) | | (max) | | 
R  |------------------|-------------|--------------|-----------------|-----------| 
R  | Underfrequency | | | | GCR, PRR, | 
R  | (UF1) | POR equiv | 361 +/- 1 Hz | 4.0 seconds | SVS | 
R  | | (PMG) |4Hz Hysteresis| (max) | | 
R  | (UF2) | POR equiv | 343 +/- 1 Hz | 160 milliseconds| | 
R  | | (PMG) |4Hz Hysteresis| (max) | | 
R  |------------------|-------------|--------------|-----------------|-----------| 
R  | Underspeed (US) | Engine speed| see paragraph| see paragraph | PRR | 
R  | IDG | for IDG | 6.5 for the | 6.5 for the | | 
R  | | (ARINC 429) | A320 engines | A320 engines | | 
R  |------------------|-------------|--------------|-----------------|-----------| 
R  | Shorted Rotating |Exciter Field| > 175 VDC | 3 seconds (max) | GCR, PRR, | 
R  | Diode/PMG to | Voltage | | | SVS | 
R  | Chassis Short | | | | | 
R  |------------------|-------------|--------------|-----------------|-----------| 
R  | Open Cable (OPC) | Differential| 80 +/- 8 Amps| 3 seconds (max) | GCR, PRR | 
R  | | Current from| | | | 
R  | | 6 hole, 2 | | | | 
R  | | wire CTA | | | | 
R  |------------------|-------------|--------------|-----------------|-----------| 
R  | Differential | Gen & Line |50 +/- 10 Amps| 60 milliseconds | GCR, PRR | 

R 1EFF : 401-499, 1 24-22-00Page 33 1 1 Aug 01/05 1 1 1CES 1

 -------------------------------------------------------------------------------
| FUNCTION | SENSING | THRESHOLD | TIME DELAY | TRIPS |
 |------------------|-------------|--------------|-----------------|-----------| 
R  | Protection (DP) | CT delta for| | (max) | | 
R  | | each phase | | | | 
R  | | measurement | | | | 
R  |------------------|-------------|--------------|-----------------|-----------| 
R  | Overcurrent (OC) | Generator | Imax + 15 A | Inverse Curve TD|BTC Lockout| 
R  | | CTs | (min) | (min) 60 +10,-0 | GCR, PRR | 
R  | | | | milliseconds | | 
R  |------------------|-------------|--------------|-----------------|-----------| 
R  |Delta Overcurrent | Generator | Delta I>75 A | Inverse Curve TD|BTC Lockout| 
R  |(DOC) | CTs | (min) | (min) | GCR, PRR | 
R  |------------------|-------------|--------------|-----------------|-----------| 
R  | Phase Sequence | POR | ABCN | 40 milliseconds | GCR | 
R  | (PSEQ) | | | (max) | | 
R  |------------------|-------------|--------------|-----------------|-----------| 
R  | Servo Valve | POR equiv | Modulation of| 2.0 seconds | GCR, PRR, | 
R  | Deterioration | (PMG) | +/- 5Hz about| (max) | SVS | 
R  | (SV) | | frequency ref| | | 
　
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