10 Disconnecting the Inverter from Voltage Sources
SMA Solar Technology AG
Operating ManualSTPx0-3SE-40-BE-en-1086
10 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.
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.
• Only use measuring devices with a DC input voltage range of 1000V or higher.
Procedure:
1. Disconnect the AC and backup miniature circuit breaker from all 3 line conductors and secure
against reconnection.
2. Set the DC load-break switch of the inverter to O.
3. Switch off the battery or the load-break switch of the battery (see documentation of the battery
manufacturer).
4. Wait until the LEDs have gone out.
5. Wait 10 minutes. This will ensure that the capacitors are discharged.
6. Use a current clamp to ensure that no current is
present in the DC cables.
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