SMA STP 25000TL-30 - Page 73

10 Troubleshooting
SMA Solar Technology AG
Operating manual STP15-25TL-30-BE-en-17 73
Procedure:
1.
DANGER
Danger to life due to electric shock
• Disconnect the inverter from all voltage sources (see Section11, page76).
• Wait 20 minutes before removing the DC protective cover.
2. Release the screws on the DC protective cover using
an Allen key (AF3), lift the DC protective cover
upwards from below and remove it.
3. Check whether one of the surge arresters is
defective.
If no stripe is visible next to the type designation in the inspection window of the surge arrester,
the surge arrester is in good condition.
If a red stripe is visible next to the type designation in the inspection window of the surge
arrester, the surge arrester is defective.
• Order new surge arresters.
• If new surge arresters are available, replace all surge arresters (see Section10.6,
page74).
4. Tighten all four screws on the DC protective cover
with an Allen key (AF3) in the sequence 1 to 4
(torque: 3Nm ± 0.3Nm).
5. Recommission the inverter (see Section7.3, page42).