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UF94200
EFFECTIVITY Page 307
ALL
EXTERNAL POWER - SYSTEM D/O
PROTECTION
In case of Ground Cart malfunction, the Protection
Module integrated in the Ground Power Control Unit
trips the Power Ready relay which opens the External
Power Contactor.
In the same way, a faulty Ground Cart cannot be
connected to the aircraft network. In this case, there
is no indication at all.
TMUELAZ02-T04 LEVEL 2
EFFECTIVITY 24-41-00 Page 8
May 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 24 ELECTRICAL POWER
UF94200
EFFECTIVITY Page 308
ALL
EXTERNAL POWER - SYSTEM D/O - PROTECTION
TMUELAZ02-P04 LEVEL 2
EFFECTIVITY 24-41-00 Page 9
May 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 24 ELECTRICAL POWER
UF94200
EFFECTIVITY Page 309
ALL
SELF EXAMINATION
The Ground Cart is running and switched on, the EXT
PWR pushbutton is pressed in and there is no
indication. What does that configuration mean?
A - The GPCU is supplied and the EPC is open.
B - The GPCU is not supplied and the EPC is
open.
C - The GPCU is supplied and the EPC is
closed.
What is the indication on the external power
receptacle when the ground cart is connected to the
aircraft network?
A - NOT IN USE light ON and AVAIL light ON.
B - NOT IN USE light OFF and AVAIL light ON.
C - NOT IN USE light OFF and AVAIL light OFF.
TMUELAZ02 LEVEL 2
EFFECTIVITY 24-41-00 Page 10
May 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 24 ELECTRICAL POWER
UF94200
EFFECTIVITY Page 310
ALL
24 - ELECTRICAL POWER
24-41-00 EXTERNAL POWER - GROUND POWER
CONTROL UNIT (GPCU) D/O
CONTENTS:
Supply
Monitoring
BITE
Self Examination
TMUELBA01 LEVEL 3
EFFECTIVITY 24-41-00 Page 1
May 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 24 ELECTRICAL POWER
UF94200
EFFECTIVITY Page 311
ALL
EXTERNAL POWER - GROUND POWER CONTROL UNIT (GPCU) D/O
SUPPLY
The Ground Power Control Unit is supplied by the Ground
Cart through the External Power receptacle and
analyses the voltage inputs.
The Pin Monitoring Relay (PMR) is energized under the
following conditions:
- Ground Cart plugged in and running (voltage at
pin E between 5 and 42 volts).
- and Ground Cart switched ON (voltage at pin F
below 42 volts and AC voltage at pins A, B and
C within the limits).
If the delivered parameters are correct, the Ground
Power Control Unit allows the External Power Contactor
to be controlled.
Two conditions must be fulfilled to energize the Power
Ready relay (PR):
- valid EP (External Power) Interlock.
- and delivered parameters within the limits.
MONITORING
The Ground Power Control Unit monitors the AC and DC
parameters.
AC protections are:
- over/under voltage.
- over/under frequency.
- Incorrect Phase Sequence (IPS).
DC protection is provided by External Power Receptacle
pin voltage monitoring.
The protection system also includes a GPCU Internal
Fault detection device.
BITE
The Ground Power Control Unit contains an internal
BITE system to help in system trouble-shooting. The
BITE system detects and isolates active and passive
failures.
The BITE system consists of two sections:
- operational BITE.
- maintenance BITE.
The operational BITE identifies the protection,
analyses the conditions and determines the fault
origin.
The maintenance BITE completes the operational BITE
and performs a self test to provide an indication of
system integrity in ground mode only.
A Class 2 failure signal is sent to the Electrical
Generation Interface Unit in order to display Ground
Power Control Unit message on the ECAM status page.
The CFDS class 2 message is labelled as:
IDG 1 (2) HIGH DELTA TEMP
To enable the 3 Generator Control Units to dialogue
with the Centralized Fault Display Interface Unit
(CFDIU) through the Ground Power Control Unit (GPCU),
the GPCU receives a back-up supply from the DC BAT BUS
(301PP).
TMUELBA01-T01 LEVEL 3
EFFECTIVITY 24-41-00 Page 2
May 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 24 ELECTRICAL POWER
UF94200
EFFECTIVITY Page 312
ALL
EXTERNAL POWER - GROUND POWER CONTROL UNIT (GPCU) D/O
TMUELBA01-P01 LEVEL 3
EFFECTIVITY 24-41-00 Page 3
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