Disconnecting The Inverter From Voltage Sources - SMA STP 50-40 Operating Manual

SMA Solar Technology AG
9

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 DC input voltage range of 1000 V or higher.
Procedure:
1. Disconnect the AC miniature circuit breaker and secure against reconnection.
2. Turn the DC load-break switch of the inverter to position O.
3. If your country requires the DC load-break switch to be protected against reconnection, secure
the DC load-break switch against reconnection with a suitable padlock.
4. If the multifunction relay is used, switch off any supply voltage to the load.
5. Wait until the LEDs have gone out.
6. Use a current clamp to ensure that no current is
present in the DC cables.
7. Note the position of the DC connector.
Operating manual
9 Disconnecting the Inverter from Voltage Sources
WARNING
A
B
C
STP50-4x-BE-en-23 91