Disconnecting the product 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 1100 V or higher.

Procedure:

  1. Disconnect the AC miniature circuit breaker and secure against reconnection.
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  2. Switch off all 4 DC load-break switches of the inverter and secure against reconnection.
  3. Wait until the LEDs have gone out.
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  4. Use a current clamp to ensure that no current is present in the DC cables.
  5. Note the position of the DC connectors.

  6. 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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  7. Release and remove the DC connectors. To do so, insert a flat-blade screwdriver or an angled screwdriver (blade width: 3.5 mm) into one of the side slots and pull the DC connectors out. When doing so, do not lever the DC connectors out, but insert the tool into one of the side slots only to release the locking mechanism, and do not pull on the cable.
  8. Ensure that the DC connectors on the product and those that are equipped with DC conductors are in perfect condition and that none of the DC conductors or DC plug contacts are exposed.

  9. DANGER

    Danger to life due to high voltages

    Once disconnected from voltage sources, residual voltages can remain in the product that should be allowed to discharge completely.

    1. Wait 5 minutes before opening the cable compartment.
  10. Open the cable compartment ( > Opening the Cable Compartment).
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  11. Verify a de-energized state of the AC connection between L1 and L2, L2 and L3, L1 and L3 und L1 and grounding conductor, L2 and grounding conductor and L3 and grounding conductor using a suitable measuring device. For this purpose, hold the test prod to the conductors' ring terminal lugs.

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