P0WER DISTRIBUTION PANEL P6

DC Tie Relay Installation
Figure 401

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757 MAINTENANCE MANUAL
 (d)  Remove the DC tie relay.
 TASK 24-32-02-424-014
 3. Install the DC Tie Relay (Fig. 401)
________________________
 A. References
 (1)  
AMM 24-22-00/201, Electrical Power - Control

 (2)  
AMM 27-61-00/201, Spoiler Speedbrake Control System

 B. Access
 (1)  Location Zone
 211/212 Flight compartment

 C. Install the DC Tie Relay
 S 424-005
 (1)  Do these steps to install the DC tie relay:
 (a)
Put the DC tie relay in position in the P6 panel.

 (b)
Install the four screws that hold the DC tie relay.

 WARNING: MAKE SURE YOU CONNECT THE LEADS TO THE CORRECT TERMINALS ON THE
_______ DC TIE RELAY. INCORRECT CONNECTION OF THE LEADS CAN CAUSE INJURY TO PERSONS AND SERIOUS DAMAGE TO THE AIRPLANE.
 (c)  Connect the leads to the DC tie relay.
 D. Do a Test of the DC Tie Relay Installation
 S 864-006
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 864-008

 (2)  
Make sure this circuit breaker on the P6 panel is closed:

 (a)  6A6, DC BUS TIE CONT
 S 864-009
 (3)  
Make sure the six EICAS circuit breakers on the overhead circuit breaker panel, P11, are closed.

 S 714-007

 (4)  
Do a test of the DC tie relay installation, as follows:

 (a)  Make sure the BUS TIE switches on the pilots' overhead panel, P5, are in the AUTO position.
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 (b)  
Push the ELEC HYD switch on the EICAS MAINT panel on the right side panel, P61.

 (c)  
Open the R TRU circuit breaker on the P6 or the P32 panel: 1) 6C23 OR 32EE2, R TRU

 (d)  
Make sure these values show below R on the bottom EICAS display:

 DC-V 0
 DC-A 0
 (e)  Twelve seconds after the circuit breaker is opened, make sure these values show below R on the bottom EICAS display:
 DC-V 28 |4
 DC-A 0
 E. Put the Airplane Back to its Usual Condition
 S 864-021
 (1)  Close this circuit breaker on the P6 panel or the P32 panel:
 (a)  6C23 or 32EE2, R TRU
 S 864-015
 (2)  Open this circuit breaker on the P6 panel for 11 seconds and then close this circuit breaker:
 (a)  6A6, DC BUS TIE CONT
 S 864-011
 (3)  
Do the activation procedure for the spoilers if you did the deactivation procedure (AMM 27-61-00/201).

 (4)  
Remove electrical power if it is not necessary (AMM 24-22-00/201).

 S 864-012
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 DC TIE CONTROL UNIT - REMOVAL/INSTALLATION
__________________________________________
 1.  General
_______
 A.  The DC tie control unit, M10213, is in the main power distribution panel, P6, in the flight compartment.
 TASK 24-32-03-024-017
 2.  Remove the DC Tie Control Unit (Fig. 401)
______________________________
 A.  References
 (1)  
AMM 24-22-00/201, Electrical Power - Control
　
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