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.
NOTICE
Destruction of the measuring device due to overvoltage
- Only use measuring devices with a DC input voltage range of 1000 V or higher.
Procedure:
- Disconnect the circuit breaker from all three line conductors and secure against reconnection.
- Remove the ESS.
- Loosen two screws of the protective cover using an Allen key (AF 5) and remove the protective cover.
- Use a current clamp to ensure that no current is present in the DC cables.
- 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.
- Wait five minutes before opening the enclosure lid.
- Ensure that no voltage is present at the DC inputs of the inverter.
- Unscrew all the screws of the enclosure lid using an Allen key (AF 5) and remove the enclosure lid.
- 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.
- 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.
- Ensure that no voltage is present between any terminal of the multifunction relay and PE of the AC connecting terminal plate.
- Ground yourself before touching any component.
DANGER
Danger to life due to high voltages
The capacitors in the inverter take five minutes to discharge.
NOTICE
Damage to the inverter due to electrostatic discharge
The internal components of the inverter can be irreparably damaged by electrostatic discharge.