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 measurement ranges designed for the maximum AC and DC voltage of the inverter.

NOTICE

Damage to the inverter due to switching operations on the transformer

If voltages are present in the inverter, switching operations on the transformer can lead to large fluctuations in the voltage in the inverter. Large fluctuations in voltage can damage components in the inverter.

  1. Disconnect the inverter from voltage sources before performing any switching operations on the transformer.

Procedure:

  1. Reduce the AC output power of the inverter to 0 W. To do this, stop the inverter.
  2. Disconnect the AC miniature circuit breaker and secure against reconnection.
  3. Disconnect the DC terminal of the inverter via the load-break switch of the battery or the external DC switch.
  4. Wait 5 minutes. This will ensure that the capacitors are discharged.
  5. Wait until the LEDs have gone out.
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  6. Remove the cover from the enclosure lid.
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  7. Unscrew the screw on the enclosure lid (hex socket, AF10) and remove the enclosure lid.
  8. Set the screw, cover and cover of the enclosure aside and store safely.
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  9. Use a current clamp to ensure that no current is present in the DC cables. As a result, a possible residual current can be detected.
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  10. Ensure that no voltage is present on the DC voltage measuring points of the pre-charge unit: between BAT+ and BAT-, BAT+ and DST- as well as BAT- and DST-.
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  11. Ensure that no voltage is present on the AC terminal block using a suitable measuring device: between L1 and grounding conductor, L2 and grounding conductor, L3 and grounding conductor, L1 and N, L2 and N, L3 and N as well as between N and grounding conductor. To do so, insert the test probe (maximum diameter: 2.5 mm) into the measuring points of the respective terminal blocks.
  12. Optional: Shut off the transformer.

    Also see:

    Starting the inverter
    Cleaning