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 circuit breaker from all three line conductors and secure against reconnection.
  2. If the multifunction relay is used, switch off any supply voltage to the load.
  3. Test whether there is an acoustic signal.

    4. If an acoustic signals sounds and the display shows an error message that prohibits disconnecting the ESS, wait until dark. The ESS can only be disconnected once it is dark.

    If no acoustic signal sounds and the display does not show an error message, remove the ESS.

  4. Wait until the LEDs and the display have gone out.
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  5. Remove all six screws from the lower enclosure lid using an Allen key (AF 3).
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  6. Flip the lower enclosure lid up and remove it.

  7. CAUTION

    Risk of burns when touching the DC protective cover

    The DC protective cover can get hot during operation.

    1. Do not touch the DC protective cover.
  8. Use an appropriate measuring device to ensure that no voltage is present at the AC connecting terminal plate between L1 and N, L2 and N, and L3 and N. Insert the test probe into each round opening of the terminal.
  9. Use an appropriate measuring device to ensure that no voltage is present at the AC connecting terminal plate between L1 and PE, L2 and PE, and L3 and PE. Insert the test probe into each round opening of the terminal.
  10. If you are using the multifunction relay, ensure that no voltage is present between any of the terminals on the multifunction relay and PE on the AC connecting terminal plate.
  11. Use a current clamp to ensure that no current is present in the DC cables.
  12. Release and remove all DC connectors. To do this, 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 straight out. Do not pull on the cable.

  13. DANGER

    Danger to life due to high voltages in the inverter

    The capacitors in the inverter take 20 minutes to discharge.

    1. Wait 20 minutes before opening the upper enclosure lid.
    2. Do not open the DC protective cover.

  14. NOTICE

    Damage to the inverter due to electrostatic discharge

    Touching electronic components can cause damage to or destroy the inverter through electrostatic discharge.

    1. Ground yourself before touching any component.
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