Maintenance 43
Fan replacement
CAUTION
Before replacing the fan, turn the rectifier OFF. Completely disconnect and remove it from the shelf. Wait thirty minutes to allow all internal capacitors to fully discharge and for all components to cool down.
CAUTION
Keep any dirt, dust, moisture or metallic particles from entering into the unit.
Procedure 7 - Replacing the fan
Step | Action |
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1 | Disconnect the |
| to Figure 12). |
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2 | With the unit sitting solidly on a clean workbench, carefully remove the |
| four mounting screws that hold the fan assembly in place. |
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3 | Slowly and carefully remove the fan assembly by pulling it from the |
| chassis. |
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4 | Replace with a new one. |
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5 | Mount the fan assembly in the same orientation as the old one. Ensure the |
| orientation of the fans is such that the air is blown outwards when the |
| fans are operated. |
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6 | Mount the fan and fan grill using the four retaining screws. |
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7 | Reconnect the fan connector. |
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8 | Plug the unit back in and power it up. Holding a piece of paper at the front |
| of the unit should confirm that the air is pulled inwards from the front. |
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9 | Listen carefully to detect any noise coming from the fans. They should run |
| freely. Verify that the fan alarm is OFF. |
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| |
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Helios Rectifier 25/48 Installation and User Manual
