20-44-49 Page 2
Miscellaneous Quadrax Connectors - Contact Arrangement
ABS1054
Figure 002
20-44-49 Page 3
Miscellaneous Quadrax Connectors - Connection Table
ABS1054
Figure 003
20-44-49 Page 4
___________________________________________
TERMINAL BLOCKS - DESCRIPTION AND OPERATION
_______
1. General This chapter concerns the following terminal blocks installed of aircraft:
A. Modular Terminal Blocks (Ref. 20-44-51)
NSA937901
B. Non-Modular Terminal blocks (Ref. 20-44-52)
NSA937903
NSA937904
NSA937905
NSA937906
E0421
E0467
E0647
20-44-50 Page 1
___________________________________________________MODULAR TERMINAL BLOCKS - DESCRIPTION AND OPERATION
_______
1. General R Modular terminal block elements installed on aircraft have the codes that
R follow: R ABS1438 R NSA937901
R _______________________2. ABS1438 Junction Module
R A. P/N identification
R ABS1438 D 20-01
R | | |
R | | |
R | | ------------------
R | |
R | -----------------------
R |
R |
R -----------------------------
R B. Layout
R (Ref. Fig. 001)
R C. Contact arrangement
R (Ref. Fig. 001)
R _________________________________________
3. NSA937901 Modular Terminal Block Elements
Arrangement code Type code | D = Unsealed | E = Sealed Standard P/N
A. P/N identification R (Ref. Fig. 002)
NSA937901 | | | | | |R 0085| || |
| ------------------Item Number|-----------------------Type code
-------------------------------Standard P/N
B. P/N characteristics
(1) Temperature Minimum operating temperature is -50 deg.C (-58.00 deg.F). Maximum operating temperature is 175 deg.C (347.00 deg.F).
20-44-51 Page 1
R Modular Terminal Blocks - Junction Module Contact Arrangement R ABS1438 R Figure 001
20-44-51 Page 2
R Modular Terminal Blocks - P/N Identification NSA937901
R Figure 002
20-44-51 Page 320-44-51 Page 4
C. Description
R (1) Full assembly.
R (Ref. Fig. 003)
R (2) Elements layout.
R (Ref. Fig. 004, 005, 006, 007)
R Modular Terminal Blocks - Full Assembly NSA937901
R Figure 003
20-44-51 Page 5
Modular Terminal Blocks - Element Layout NSA937901 R Figure 004
20-44-51 Page 6
R Modular Terminal Blocks - Element Layout NSA937901
R Figure 005
20-44-51 Page 7
Modular Terminal Blocks - Element Layout NSA937901 R Figure 006
20-44-51 Page 8
R Modular Terminal Blocks - Element Layout NSA937901
R Figure 007
20-44-51 Page 920-44-51 Page 10
R R __________4. Procedures
R R A. Junction Modules
R R (1) Contact arrangements (Ref. Fig. 001, 008, 009)
R (2) Connection
_______CAUTION : DO NOT INSTALL CRIMP-ON CONTACTS INTO CAVITIES THAT ARE NOT USED (IT IS NOT POSSIBLE TO REMOVE THEM).
R Make a selection of the applicable contact dimension for the junction-module contact size code. Example: Contact size 20 is necessary with junction module M 20-01.
R (3) Installation
R R R (a) On rail (NSA937901R, RA or RB): Install the modules on the terminal block rail in a number sequence that increases. When you are opposite the modular terminal block, read horizontally from left to right (module 1 on left), and read vertically from top to bottom (module 1 on top). You move and lock the modules in position when you lock the end clamps (torque value between 0.07 and 0.10 daNm).
____NOTE : You must safety the end clamps with lockwire in vibration areas (Ref. 20-51-15 locking procedure for end clamps).
R R R R (b) On module support (NSA937915): (Ref. Fig. 010) The base design (clip height/support that holds the module) prevents incorrect installation of the module (Note: the lower yoke must be on the module-plate side). You must install the module in the support before you attach it. To do this: - hold the support with one hand and with the other hand, put the module on the plate, identification side first, and lower the other side a few millimeters, - turn the module to engage it into its housing and lock the base in the support clips.
R Modular Terminal Blocks - Junction Module Contact Arrangements NSA937901 Figure 008
20-44-51 Page 11
R Modular Terminal Blocks - Junction Module Contact Arrangements NSA937901 Figure 009 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：A320 ESPM Electrical Standard Practices Manual 3(57)
