Disconnecting the Inverter from Voltage Sources


Qualified person

Prior to performing any work on the inverter, 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 circuit breaker and secure it against reconnection.
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  3. Set the DC load-break switch of the inverter to O.
  4. Wait until the LEDs have gone out.
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  6. Use a current clamp to ensure that no current is present in the DC cables.
  7. 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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  8. 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.
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  10. Ensure that no voltage is present between the positive terminal and negative terminal at the DC inputs using a suitable measuring device.
  11. Ensure that no voltage is present between the positive terminal and ground as well as between the negative terminal and ground on the DC inputs using a suitable measuring device.
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  13. Unscrew the AC connector and pull it out of the jack for the AC connection.