ESP EX-400 Guide de dépannage télécharger pdf (Page 14)

D. Replacing Faulty SCRs and Diodes.

1. Make sure that heatsink mounting surfaces are cleaned before replacing faulty components.

2. For diodes and SCRs, coat mounting surfaces with Alcoa No. 2 EJC Electrical Joint Compound.

3. Clamping procedure for Main Bridge SCRs (4, 5 and 6).

(a) Tighten the SCR clamp nuts by hand until fingertight.

(b) Then, using a wrench, alternately tighten each nut 1/4 turn at a time until the spring indicator on the

clamp assembly shows 1000-1500 pounds, or 1 to midway between 1 and 2 on the indicator.

4. Torque procedure for remaining SCRs and diodes.

Use a torque wrench to tighten stud mounted SCRs and diodes. Recommended torques are listed in table

3-1.

Table 3-1. Recommended Torques

SECTION 3

MAINTENANCE

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Main Bridge Diodes

D4, 5, 6, 7

Min., 275 in-lbs (23 ft · lbs)

Max., 325 in-lbs (27 ft · lbs)

Boost Bridge Diodes

D1, 2, 3

Min., 20 in-lbs (1.7 ft · lbs)

Max., 30 in-lbs (2.5 ft · lbs)

Boost Bridge SCR's

SCR1, 2, 3

Min., 125 in-lbs (10.4 ft · lbs)

Max., 150 in-lbs (12.5 ft · lbs)

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 27 28

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ESP EX-400 Guide de dépannage Page 14