ASTAT
SCR Module Replacement (Sizes K, L, and Y)
This procedure requires the following tools and materials:
•#2
•Scotchbrite or equivalent abrasive
•Mild solvent to clean mounting surfaces
•Electrolube 2GX or equivalent thermal grease
1.Loosen the screws holding the MOVs and bus bars to the SCR Module to be replaced, as illustrated in Figure 12, and remove the MOVs and bus bars.
2.Remove the mounting screws at each end of the SCR Module, as shown in Figure 13, then lift out the Module. Retain all the parts and hardware removed from the SCR Module for reassembly with the replacement Module.
3.Clean the heat sink surface of the replacement Module with a fine abrasive, such as Scotchbrite. Remove all particles from the heat sink surface and wipe the SCR mounting surface with a mild solvent. Apply a light coat of thermal grease, such as Electrolube 2GX to both the SCR and heat sink surfaces.
4.Place the contact face of the SCR Module on the mating heat sink surface. Move the Module back and forth several times to distribute the thermal grease evenly over the contact surfaces.
5.Attach the SCR Module to the heat sink with the screws removed earlier. Tighten the screws to 44 in- lb.
6.Reattach the bus bars and MOVs to the SCR Module with the screws removed earlier. Tighten the screws to 26
Figure 12. Removing the MOVs and bus bars from an SCR to be
replaced.
Figure 13. Removing the SCR module.
6 | Prices and data subject to change without notice. |
