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 600 V or higher.

Procedure:

  1. Disconnect the AC circuit breaker and secure it against reconnection.
  2. Switch off the battery or the load-break switch of the battery (see documentation of the battery manufacturer).
  3. Wait five minutes. This will ensure that the capacitors are discharged.
  4. Unscrew all six screws of the enclosure lid of the Connection Unit and remove the enclosure lid carefully towards the front (TX25). When doing so, note that the LED assembly in the enclosure lid and the communication assembly in the inverter are connected via a ribbon cable.
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  6. Pull the ribbon cable connecting the LED assembly in the enclosure lid to the communication assembly out of the jack located on the communication assembly.
  7. Ensure that no voltage is present on the AC-out terminal block between L and N using a suitable measuring device. To do this, stick the test probe in each rectangular opening of the terminal.
  8. Ensure that no voltage is present on the AC-out terminal block between L and PE using a suitable measuring device. To do this, stick the test probe in each rectangular opening of the terminal.