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 External Power Configuration - Block Diagram
 Figure 003A

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1R External Power Configuration - Block Diagram R Figure 003B

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 Ground Power Control Unit (GPCU) - Schematic Diagram
 Figure 004

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 Ground Power Control Unit (GPCU) - Schematic Diagram
 Figure 004A

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R Ground Power Control Unit (GAPCU) - Schematic Diagram R Figure 004B
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 3
_

 This relay when energized, connects a holding supply to the GPU line contactor. It is energized when the DC input voltage (Pin E and F) is within acceptable limits (less than 42 VDC).
 -The External Power Available Relay (PR) The PR when excited enables the connection of the ground power unit to the aircraft network provided none of the following protections is actived: . over/undervoltage, . over/underfrequency, . incorrect phase order, . GPCU internal fault.
 Any fault detection:
 -prevents the ground power unit from being connected to the
 aircraft network, - or causes it to trip if already in line.
 NOTE : When a fault is detected, the PR is no longer excited
____ and/or inhibits illumination of the ON legend of the EXT PWR pushbutton switch.
 NOTE : The PR also controls the illumination of the AVAIL
____ legend of the EXT PWR pushbutton switch in the cockpit and the EXT PWR AVAIL caution light in the external power receptacle housing.
Protections
 -Over/underfrequency (OF, UF) The control unit permanently monitors the frequency of phase A voltage of the external power receptacle. The over/underfrequencies protection are triggered when the frequency becomes higher/lower than a certain threshold.
 -Over/undervoltage (OV, UV) The control unit permanently monitors the voltage of the three phases of the external power receptacle. The undervoltage protection is triggered when the voltage of the lower phase becomes lower than a certain threshold.
 -Incorrect phase order (IPS) This detection is performed from voltage information of phases A and B of the external power receptacle. After excitation of the ground power unit generator, the control unit analyzes the phase order of the voltage supply. When the voltage is incorrect, the GPCU prevents the closure of the PR relay (protection of the three phase consumers).
 NOTE : This protection is effective in case of:
____ cross connection between any two phases,
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 and also if a phase and the neutral are crossed.

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 A table listing these functions is shown below: GPCU PROTECTIONS
 ------------------------------------------------------------------------------I I FUNCTION ISENSING I THRESHOLD ITIME DELAY ITRIPSI REMARKS I INHIBITION I ------------------------------------------------------------------------------I IEP Overvol-IHighest I 124-132 I Inverse IEPC, I I I Itage (OV) Iphase EPI Volts I IGSR'sI I I I Ivoltage I I I I I I I-----------I--------I-----------I-----------I-----I-------------I------------I IEP Under-IIndivi- I 100 plus I 3 - 5 s IEPC IThis functionI I Ivoltage Idual I or minus I IGSR'sIcovers open I I I(UV) Iphase I 4 V I I Iphase. I I I Iunder-I I I I I I I Ivoltage I I I I I I I-----------I--------I-----------I-----------I-----I-------------I------------I IEP Overfre-IEP fre- I 433 plus I 3 - 5 s IEPC I I I Iquency (OF)Iquency I or minus I IGSR'sI I I I I I 3 Hz I I I I I I-----------I--------I-----------I-----------I-----I-------------I------------I IEP Under-IEP fre- I 363 plus I 3 - 5 s IEPC I I I Ifrequency Iquency I or minus I IGSR'sI I I I(UF) I I 3 Hz I I I I I I-----------I--------I-----------I-----------I-----I-------------I------------I IEP Phase I2 phasesI A-B-C-N I None IEPC IPrevents EPC I I ISequence I Iphase I IGSR'sIclosure if I I I(PS) I Isequence I I Iphase sequen-I I I I I I I Ice is not ABCI I I I I I I Ior if neutralI I I I I I I Iand phase I I I I I I I Ilead are I I I I I I I Icrossed. I I -------------------------------------------------------------------------------
(b) BITE Functions
 1 System self monitoring and function
_ The same test philosophy applies for the GCU and as well as for the GPCU (Ref. 24-22-00).
　
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