KIT (SEAL) 8U2257 - Caterpillar

By using the cloth (2), clean the grease from the surface of the heat sink. Refer to Illustration 1.
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The grease has been applied to the thyristor.
Apply the thermal grease to the base of the thyristor by using the needle (2). Refer to Illustration 1.
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Spatula (3A) Straight face (3B) "Another module" face
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The grease has been spread on the thyristor.
Spread the grease into a thin layer by using the straight face (3a) of the spatula. Refer to Illustration 7.Hold the face at a slight angle to the base of the thyristor and spread the grease evenly across the face.
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The spatula should be held perpendicular to the thyristor.
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Grease has been properly applied to the thyristor.
Hold the "Another module" face (3b) of the spatula perpendicular to the base of the thyristor and drag the spatula across the base. Refer to Illustration 7. This action will create a grooved surface in the grease. Refer to Illustration 10.
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The thyristors are mounted on a 60 kVA single UPS.
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The thyristors are mounted on a 120 kVA single UPS.
Install the thyristors on the heat sink by using the M5x16 screws (4). Refer to Illustration 11 and Illustration 12.Note: Torque the screws to 5.4 N m (47.79 lb in).
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Detail of hardware (5) Screw (CBLX M5x10) (6a) Spacer (M/M M5 M4 H20) (6b) Spacer (M/F M4 M4 H10) (6c) Spacer (M/M M5 M4 H10)
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Detail of installation for a 60 kVA Single UPS (5) Screw (6a) Spacer (6b) Spacer (6c) Spacer
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Detail of installation for 120 kVA Single UPS (5a) Screw (6a) Spacer (6b) Spacer (6c) Spacer
Install the bus bar on the thyristors. Use the screws (5) and the spacers (6x). Refer to Illustration 13 through 15.Note: Torque the screws and the spacers to 3.5 N m (30.98 lb in).
Install the circuit board to the spacers. Refer to Illustration 13 through 15.Note: Torque the screws (M4) on the circuit board to 1.5 N m (13.28 lb in).
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Power connections on CSNEN board
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Power connections on CSNON board
Connect the power from the circuit board to the thyristors. Refer to Illustration 16 and Illustration 17.Note: The connectors that are used on these boards ensure that correct polarity of the power is maintained.