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5 Disconnecting the Inverter from Voltage Sources SMA Solar Technology AG
Replacement Manual STP50-DC-EMV-DST-RM-xx-10 12
Designation Quantity
Bolt M6 x 12 4
Replacement Manual 1
4.2 Scope of delivery of DST assembly
Check the scope of delivery for completeness and any externally visible damage. Contact your
distributor if the scope of delivery is incomplete or damaged.
Designation Quantity
DST assembly 1
Bolt M4 x 15 22
Bolt M6 x 12 8
Cleaning cloth 4
Replacement Manual 1
5 Disconnecting the Inverter from Voltage Sources
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.
• Only use measuring devices with a DC input voltage range of 1000 V or higher.
Procedure:
1. Disconnect the AC circuit breaker and secure it against reconnection.
2. For STP 50-US-40 / STP 33-US-41 / STP 50-US-41 / STP 62-US-41: Set the AC load-break
switch of the inverter to position O .
3. Set the DC load-break switch of the inverter to position O .
4. If the multifunction relay is used, switch off any supply voltage to the load.
5. Wait until the LEDs have gone out.
ENGLISH