Operating Manual SB3-5TL-21-BE-en-10 47
SMA Solar Technology AG 10 Disconnecting the Inverter from Voltage Sources
10 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.
WaHiw_Zerstörung des Messgeräts durch Überspannung
Procedure:
1. Disconnect the circuit breaker and secure against reconnection.
2. If an additional DC load-break switch is available, switch off the DC load-break switch and
secure against re-connection.
3. If the ESS is plugged in, remove the ESS.
4. If the multi-function relay is used, switch off the load supply voltage, if necessary.
5. Wait until the LEDs, display and if necessary, the load connected to the multi-function relay,
are switched off.
6. Use a current clamp to ensure that no current is present in the DC cables.
7. Remove all six screws of the lower enclosure lid using an Allen key (AF 3) and remove the
enclosure lid.
Damage to the seal of the enclosure lid during sub-zero conditions
If you open the upper and lower enclosure lid during sub-zero conditions, the seal of the enclosure
can be damaged. As a result, moisture can penetrate the inverter.
• Do not open the inverter at ambient temperatures lower than -5°C.
• If a layer of ice has formed on the seal of the lid in sub-zero conditions, remove it prior to
opening the inverter (e.g. by melting the ice with warm air). Observe the applicable safety
regulations.
Destruction of the measuring device due to overvoltage
• Only use measuring devices with a DC input voltage range up to 1,000 V.
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