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R  The undervoltage protection is triggered when the voltage of 
R  the lower phase becomes lower than a certain threshold. 
R  - Incorrect phase order (IPS) 
R  This detection is performed from voltage information of 
R  phases A and B of the external power receptacle. 
R  After excitation of the ground power unit generator, the 
R  control unit analyzes the phase order of the voltage supply. 
R  When the voltage is incorrect, the GAPCU prevents the 
R  closure of the PRR relay (protection of the three phase 
R  consumers). 

R 1EFF : 401-499, 1 24-41-00Page 26 1 1 Aug 01/05 1 1 1CES 1

R  NOTE : This protection is effective in case of:____ 
R  cross connection between any two phases, 
R  and also if a phase and the neutral are crossed. 
R  A table listing these functions is shown below: 
R 
R  GAPCU PROTECTIONS 
R  -------------------------------------------------------------------------------
R  | External Power | SENSING | THRESHOLD | TIME DELAY | TRIPS| 
R  | FUNCTION | | | | | 
R  |--------------------|-----------------|---------------|---------------|------I 
R  |Overvoltage (0V) |Highest EP phase |130 +/- 1.5V |Inverse Curve |IMR, | 
R  | | | |(max) |EPRR | 
R  |--------------------|-----------------|---------------|---------------|------| 
R  |Undervoltage (UV1) |Lowest EP phase |101.5 +/- 1.5V |4.5 seconds |IMR | 
R  | | |4V Hysteresis |(max) |EPRR | 
R  |--------------------|-----------------|---------------|---------------|------| 
R  |Overfrequency (OF1) |EP |435 +/- 1Hz |4.0 seconds |IMR, | 
R  | | |4 Hz Hysteresis|(max) |EPPR | 
R  |--------------------|-----------------|---------------|---------------|------| 
R  |Underfrequency (UF1)IEP |361 +/- 1Hz |4.0 seconds |IMR, | 
R  | I |4 Hz Hysteresis|(max) |EPRR | 
R  | (UF2)I |323 +/- 1Hz |160 milli-| | 
R  | | |4 Hz Hysteresis|seconds (max) | | 
R  |--------------------I-----------------|---------------|---------------|------| 
R  |External Power IEP interlock pins|60 +/- 6VAC |Such that No |IMR, | 
R  |Interlock IE and F |45 +/- 5VDC |Damage is |EPRR | 
R  | I | |incurred in the| | 
R  | | | |GAPCU | | 
R  -------------------------------------------------------------------------------
R  (b) BITE Functions 
R  1 System self monitoring and function_ 
R  The same test philosophy applies for the GCU and as well as 
R  for the GAPCU (Ref. 24-22-00). 
R  **ON A/C ALL
 5. Operation/Control and Indicating________________________________

 

R  **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
 (Ref. Fig. 005)
 A. Control and Indicating Circuits
 (1) Controls and indicating in the cockpit As soon as the ground power unit is connected and selected on, the GPCU analyzes the voltage delivered at the external power receptacle. If the analyzed parameters are correct: - the GPCU controls the illumination of the green AVAIL legend of EXT PWR pushbutton switch located on the overhead ELEC panel 35VU. This pushbutton switch controls the energization of the transfer network by means of the external power contactor (EPC). EPC supply is shown in this figure, - when the AVAIL legend of this pushbutton switch is illuminated, the EPC remains open.
 NOTE : Nevertheless, the ground power unit can supply ground/flight____ networks in ground service configuration (Ref. 24-42-00).
 - when the pushbutton switch is pressed and released, the EPC closes and supplies the transfer circuit. Blue ON legend comes on to indicate the closure of EPC (AVAIL legend goes off). 
R  **ON A/C 401-499, 
R  (Ref. Fig. 005A) 
R  A. Control and Indicating Circuits 
R R R R R R R R R R R R  (1) Controls and indicating in the cockpit As soon as the ground power unit is connected and selected on, the GAPCU analyzes the voltage delivered at the external power receptacle. If the analyzed parameters are correct: - the GAPCU controls the illumination of the green AVAIL legend of EXT PWR pushbutton switch located on the overhead ELEC panel 35VU. This pushbutton switch controls the energization of the transfer network by means of the external power contactor (EPC). EPC supply is shown in this figure, - when the AVAIL legend of this pushbutton switch is illuminated, the EPC remains open.
　
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