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SMA Solar Technology AG
11 Disconnecting from voltage sources
11.1
Disconnecting the Inverter from Voltage Sources
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.
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.
• Only use measuring devices with a measurement ranges designed for the maximum AC and DC voltage of the
inverter.
• Only use measuring devices with measurement ranges designed for the maximum DC voltage of the battery.
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.
• 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 15 minutes. This will ensure that the capacitors are discharged.
5. Wait until the LEDs have gone out.
6. Remove the cover from the enclosure lid.
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.
System Manual
WARNING
NOTICE
11 Disconnecting from voltage sources
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