Required Tools
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| Illustration 1 | g02137576 |
355-8579 Grease As for thermal application (1) Needle (2) Cleaning cloth (3) Spatula | |
- Installation kit
- Torque wrench
Required Parts
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| Illustration 2 | g02137699 |
Typical thyristors | |
Table 1 lists the required thyristor for your application.
| Type | 60 kVA | 120 kVA |
|---|---|---|
| AC Bypass Single UPS |
367-4285 90 Amp 1400 v |
353-8595 160 Amp 1400 v |
Procedure
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High voltage may be present. Work on this equipment must be performed by authorized trained personnel. Failure to disconnect the power source before performing maintenance or removing modules exposes personnel to electrical potential. Bodily contact with electrical potential will cause serious personal injury or death. |
| NOTICE |
|---|
Electrostatic discharge can damage integrated circuits or semiconductors if you touch the connector pins. When not in use, keep modules in static shielded bags. Follow these guidelines when you handle modules: Allow a minimum of 5 minutes for capacitors to discharge. Touch a grounded object to discharge static potential. Wear a wrist-strap grounding device. Do not touch the connector pins. Do not touch circuit components inside the module. If available, use a static-safe work station. |
- Remove power from the UPS by following the appropriate shutdown routine. Allow at least 5 minutes for the capacitors to discharge to remove any stored energy.
ReferenceOperation and Maintenance Manual, SEBU8516, "Single UPS Startup and Shutdown" and "Parallel UPS Startup and Shutdown".
- Disconnect the wires and disconnect the ribbon cables from the circuit board.
- Remove the circuit board.
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| Illustration 3 | g02140885 |
The circuit board has been removed. | |
- Remove the bus bar that is attached to the thyristors.
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| Illustration 4 | g02140887 |
The bus bar has been removed. | |
- Remove the thyristors.
- By using the cloth (2), clean the grease from the surface of the heat sink. Refer to Illustration 1.
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| Illustration 5 | g02140891 |
Heat sink with cleaned surface | |
- Apply the thermal grease to the base of the thyristor by using the needle (2). Refer to Illustration 1.
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| Illustration 6 | g02137896 |
The grease has been applied to 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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| Illustration 7 | g02137923 |
Spatula (3A) Straight face (3B) "Another module" face | |
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| Illustration 8 | g02137905 |
The grease has been spread on 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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| Illustration 9 | g02137979 |
The spatula should be held perpendicular to the thyristor. | |
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| Illustration 10 | g02138056 |
Grease has been properly applied to the thyristor. | |
- 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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| Illustration 11 | g02138116 |
The thyristors are mounted on a 60 kVA single UPS. | |
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| Illustration 12 | g02138146 |
The thyristors are mounted on a 120 kVA single UPS. | |
- 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).
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| Illustration 13 | g02140977 |
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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| Illustration 14 | g02140900 |
Detail of installation for a 60 kVA Single UPS (5) Screw (6a) Spacer (6b) Spacer (6c) Spacer | |
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| Illustration 15 | g02140902 |
Detail of installation for 120 kVA Single UPS (5a) Screw (6a) Spacer (6b) Spacer (6c) Spacer | |
- 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).
- 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.
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| Illustration 16 | g02140906 |
Power connections on CSNEN board | |
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| Illustration 17 | g02140910 |
Power connections on CSNON board | |