DC MAIN GENERATION - DESCRIPTION AND OPERATION

** ON A/C NOT FOR ALL

1. General
The DC main generation is provided by the two Transformers Rectifiers 1 and 2 (TR1 and TR2).
They are supplied with three phases 115 VAC/400 Hz voltage from the normal Alternating Current (AC) distribution network.

** ON A/C NOT FOR ALL

2. Component Location

DC Main Generation (TR) - Component Location ** ON A/C NOT FOR ALL

FIN	FUNCTIONAL DESIGNATION	PANEL	ZONE	ATA REF
** ON A/C ALL
1PU1	TR-1		126	24-32-51
1PU2	TR-2		124	24-32-51
5PU1	CNTOR-TR 1	120VU	212	24-32-55
5PU2	CNTOR-TR 2	120VU	212	24-32-55
14PU	CNTOR-TR 2/AC SVCE BUS NORM SPLY	120VU	212	24-32-55
15PU	P/BSW-TR RST	103VU	126	24-32-00

** ON A/C NOT FOR ALL

3. Component Description

A. Transformer Rectifier FIN: 1-PU-1 FIN: 1-PU-2

(1) Operation

Transformer Rectifier 1 (TR1) - Component Description

Transformer Rectifier 2 (TR2) - Component Description

Transformer Rectifier Contactor Control - Simplified Logic

Each TR controls its contactor via an internal TR logic.
This logic, which is intended to protect the Direct Current (DC) network and the TR, controls contactor opening in case of:

no current flow to the DC BUS (minimum current detection),
TR overheat (171/Deg.C).

To ensure these protections, each TR sends a fault signal to the Centralized Fault Display System (CFDS) for maintenance purpose.
Main TR's are ventilated by air extracted from the aircraft ventilation network.

B. TR Characteristics

supply: 115 VAC/400 Hz, three phase
DC output current:
200 A in continuous operation
300 A for 5 minutes
500 A for 30 seconds
1000 A for 1 second
DC output voltage:
30.2 V with no load
27.5 V at 200A.
TR1 (1PU1), TR2 (1PU2) and essential TR (1PE) are fully interchangeable and have the same electrical properties.

supply: 115 VAC/400 Hz, three phase
DC output current:
200 A in continuous operation
300 A for 5 minutes
500 A for 30 seconds
1000 A for 1 second
DC output voltage:
30.2 V with no load
27.5 V at 200A.
TR1 (1PU1) is fully interchangeable with essential TR (1PE) and has the same electrical properties.

NOTE: TR2 (1PU2) has not the same electrical properties and is not interchangeable.

** ON A/C NOT FOR ALL

4. Operation/Control and Indicating

A. Normal Operation
The transformers rectifiers start to operate as soon as they are supplied:

TR1 is supplied by 1XP busbar,
TR2 is normally supplied by 2XP busbar.

NOTE: TR2 can also supply part of the DC network from the ground power unit and in ground service configuration (Ref. AMM D/O 24-43-00-00).

The parameters such as voltage and current are available and displayed via the SDAC on the ELEC page on the lower ECAM DU.

B. Failure of the TR1(2)

TR1 Fault (Class 1 - Level 1) - ECAM

Normal Operation - Lower ECAM Display unit

In case of failure of the TR1(2), the TR FAULT warning appears on the upper ECAM display unit and at the same time, the ELEC page is displayed on the ECAM lower display unit.

C. Table of Main Signals

(1) Table of Main Digital Signals Sent Out by the Equipments to SDAC 1(2)

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| PARAMETER LIST PARAMETER CHARACTERISTICS (NUMERIC) |

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! 1 102 01 ! BAT1 ! 512 ! A ! ! 09 ! ! ! !BCL1 !

! ! CURRENT ! ! ! ! ! ! ! ! !

! 2 102 10 ! BAT2 ! 512 ! A ! ! 09 ! ! ! !BCL2 !

! ! CURRENT ! ! ! ! ! ! ! ! !

! 1 104 01 ! BAT1 ! 32 ! V ! ! 05 ! ! ! !BCL1 !

! ! VOLTAGE ! ! ! ! ! ! ! ! !

! 2 104 10 ! BAT2 ! 32 ! V ! ! 05 ! ! ! !BCL2 !

! ! VOLTAGE ! ! ! ! ! ! ! ! !

(2) Table of Main Low Level Direct Current (LLDC) Analogic Signals sent out by the Equipments to SDAC 1(2)

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| PARAMETER LIST PARAMETER CHARACTERISTICS (NUMERIC) |

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! ! TRU1 ! ! V ! ! ! ! ! !1PU1 !

! ! VOLTAGE ! ! ! ! ! ! ! ! !

! ! TRU1 ! ! A ! ! ! ! ! !1PU1 !

! ! CURRENT ! ! ! ! ! ! ! ! !

! ! TRU2 ! ! V ! ! ! ! ! !1PU2 !

! ! VOLTAGE ! ! ! ! ! ! ! ! !

! ! TRU2 ! ! A ! ! ! ! ! !1PU2 !

! ! CURRENT ! ! ! ! ! ! ! ! !

! ! ESS TRU ! ! V ! ! ! ! ! !1PE !

! ! VOLTAGE ! ! ! ! ! ! ! ! !

! ! ESS TRU ! ! A ! ! ! ! ! !1PE !

! ! CURRENT ! ! ! ! ! ! ! ! !

(3) Table of Main Discrete Signals Received by the SDAC 1(2)

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| PARAMETER LIST PARAMETER CHARACTERISTICS (NUMERIC) |

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! 002 00 ! ESS TRU ! ! ! ! 17 ! ! ! !3PE !

! ! CNTOR ON ! ! ! ! ! ! ! ! !

! 002 00 ! ESS TRU ! ! ! ! 17 ! ! ! !3PE !

! ! CNTOR OFF! ! ! ! ! ! ! ! !

! 002 00 !DC BAT/ DC! ! ! ! 19 ! ! ! !8PH !

! ! ESS SHED ! ! ! ! ! ! ! ! !

! ! CNTOR ON ! ! ! ! ! ! ! ! !

! 002 00 !DC BAT/ DC! ! ! ! 19 ! ! ! !8PH !

! ! ESS SHED ! ! ! ! ! ! ! ! !

! ! CNTOR OFF! ! ! ! ! ! ! ! !

! 1 002 01 !TRU1 CNTOR! ! ! ! 17 ! ! ! !5PU1 !

! ! ON ! ! ! ! ! ! ! ! !

! 1 002 01 !TRU1 CNTOR! ! ! ! 17 ! ! ! !5PU1 !

! ! OFF ! ! ! ! ! ! ! ! !

! 002 01 !DC1/DC ESS! ! ! ! 18 ! ! ! !1PC1 !

! ! CNTOR ON ! ! ! ! ! ! ! ! !

! 002 01 !DC1/DC ESS! ! ! ! 18 ! ! ! !1PC1 !

! ! CNTOR OFF! ! ! ! ! ! ! ! !

! 1 002 01 !BAT1 CNTOR! ! ! ! 19 ! ! ! !6PB1 !

! ! ON ! ! ! ! ! ! ! ! !

! 1 002 01 !BAT1 CNTOR! ! ! ! 19 ! ! ! !6PB1 !

! ! OFF ! ! ! ! ! ! ! ! !

! 002 01 !DC BAT/ DC! ! ! ! 21 ! ! ! !4PC !

! !ESS CNTOR ! ! ! ! ! ! ! ! !

! ! ON ! ! ! ! ! ! ! ! !

! 002 01 !DC BAT/ DC! ! ! ! 21 ! ! ! !4PC !

! !ESS CNTOR ! ! ! ! ! ! ! ! !

! ! OFF ! ! ! ! ! ! ! ! !

! 1 002 01 ! BAT1 P/B ! ! ! ! 24 ! ! ! !7PB1 !

! ! OFF ! ! ! ! ! ! ! ! !

! 1 002 01 ! BAT1 P/B ! ! ! ! 24 ! ! ! !7PB1 !

! ! ON ! ! ! ! ! ! ! ! !

! 2 002 10 !TRU2 CNTOR! ! ! ! 17 ! ! ! !5PU2 !

! ! ON ! ! ! ! ! ! ! ! !

! 2 002 10 !TRU2 CNTOR! ! ! ! 17 ! ! ! !5PU2 !

! ! OFF ! ! ! ! ! ! ! ! !

! 002 10 !DC2 / DC1 ! ! ! ! 18 ! ! ! !1PC2 !

! !CNTOR ON ! ! ! ! ! ! ! ! !

! 002 10 !DC2 / DC1 ! ! ! ! 18 ! ! ! !1PC2 !

! !CNTOR OFF ! ! ! ! ! ! ! ! !

! 2 002 10 !BAT2 CNTOR! ! ! ! 19 ! ! ! !6PB2 !

! ! ON ! ! ! ! ! ! ! ! !

! 2 002 10 !BAT2 CNTOR! ! ! ! 19 ! ! ! !6PB2 !

! ! OFF ! ! ! ! ! ! ! ! !

! 2 002 10 ! AC2 BUS ! ! ! ! 20 ! ! ! !16XC !

! ! OFF ! ! ! ! ! ! ! ! !

! 2 002 10 !AC2 BUS ON! ! ! ! 20 ! ! ! !16XC !

! 2 002 10 ! BAT2 P/B ! ! ! ! 24 ! ! ! !7PB2 !

! ! OFF ! ! ! ! ! ! ! ! !

! 2 002 10 ! BAT2 P/B ! ! ! ! 24 ! ! ! !7PB2 !

! ! ON ! ! ! ! ! ! ! ! !

! 1 004 01 ! DC1 BUS ! ! ! ! 29 ! ! ! !14WV !

! ! OFF ! ! ! ! ! ! ! ! !

! 1 004 01 !DC1 BUS ON! ! ! ! 29 ! ! ! !14WV !

! 2 004 10 ! DC2 BUS ! ! ! ! 29 ! ! ! !44WV !

! ! OFF ! ! ! ! ! ! ! ! !

! 2 004 10 !DC2 BUS ON! ! ! ! 29 ! ! ! !44WV !

! 004 11 !DC ESS BUS! ! ! ! 29 ! ! ! !12WV !

! ! OFF ! ! ! ! ! ! ! ! !

! 004 11 !DC ESS BUS! ! ! ! 29 ! ! ! !12WV !

! ! ON ! ! ! ! ! ! ! ! !

D. Reset of the Protection of the Transformer Rectifier (TR)
Before you reset a TR, make sure that the related electrical network supplies its primary winding, in any RESET mode.

(1) From the CFDS or on the panel 103VU
Reset of the TR protection is possible from the CFDIU (CFDS interface). If the CFDIU is not available, it is possible to start the transformers manually. To do this, push the TR RST pushbutton switch 15PU located on panel 103VU.

(2) Description of the reset procedure

TR Reset Procedure

The reset procedure must be performed by selecting the SYSTEM REPORT/TEST item on the CFDS menu, then by selecting the involved TR on ELEC menu.

(a) If the reset is effective, NO FAULT appears on the MCDU.

(b) If the reset is impossible:
TR 1(2) is displayed on the MCDU,
TR 1(2) FAULT stays on the upper ECAM display unit.

NOTE: After the reset procedure is performed, on the panel 35VU, the AC ESS FEED pushbutton switch must be released, and then pushed. The ESS TR no longer supplies the DC ESS BUS (4PP). On the lower ECAM display unit, the normal configuration comes into view.

[Rev.10 from 2021] 2026.03.31 23:23:17 UTC