Disconnecting the Inverter from Voltage Sources

Qualified person

Prior to performing any work on the product, always disconnect it from all voltage sources as described in this section. Always adhere to the prescribed sequence.

WARNING

Danger to life due to electric shock from destruction of the measuring device due to overvoltage

Overvoltage can damage a measuring device and result in voltage being present in the enclosure of the measuring device. Touching the live enclosure of the measuring device results in death or lethal injuries due to electric shock.

  1. Only use measuring devices with a DC input voltage range of 1000 V or higher.

Procedure:

  1. Disconnect the AC miniature circuit breaker and secure against reconnection.
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  2. Turn the DC load-break switch of the inverter to position O.
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  3. If your country requires the DC load-break switch to be protected against reconnection, secure the DC load-break switch against reconnection with a suitable padlock.
  4. If the multifunction relay is used, switch off any supply voltage to the load.
  5. Switch off the supply voltage of the digital signal sources if necessary.
  6. Wait until the LEDs have gone out.
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  7. Unscrew the screws (TX25) of the lid if the DC terminal cover is present.
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  8. Remove the lid downwards if the DC terminal cover is present.
  9. Use a current clamp to ensure that no current is present in the DC cables.
  10. Note the position of the DC connectors.

  11. DANGER

    Danger to life due to electric shock when touching exposed DC conductors or DC plug contacts if the DC connectors are damaged or loose

    The DC connectors can break or become damaged, become free of the DC cables, or no longer be connected correctly if the DC connectors are released and disconnected incorrectly. This can result in the DC conductors or DC plug contacts being exposed. Touching live DC conductors or DC plug connectors will result in death or serious injury due to electric shock.

    1. Wear insulated gloves and use insulated tools when working on the DC connectors.
    2. Ensure that the DC connectors are in perfect condition and that none of the DC conductors or DC plug contacts are exposed.
    3. Carefully release and remove the DC connectors as described in the following.
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  12. Unlock the DC connector using the corresponding unlocking tool and remove (refer to the manufacturer manual for further information).
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  13. Ensure that no voltage is present at the DC inputs on the inverter using a suitable voltage detector.
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  14. Loosen all ten screws of the enclosure lid (TX25) and remove the enclosure lid towards the front.
  15. Set the screws and the enclosure lid aside and store safely.
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  16. Check that there is no voltage between L1 and N, L2 and N, and L3 and N at the AC terminal block for connecting the utility grid. Use a suitable voltage detector for this purpose. To do this, insert the test probes through the openings on the terminal block.
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  17. Check that there is no voltage between L1 and grounding conductor, L2 and grounding conductor, and L3 and grounding conductor at the AC terminal block for connecting the utility grid. Use a suitable voltage detector for this purpose.
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