Troubleshooting SMA Solar Technology AG
78 SMC9-11TLRP-IEN100640 Installation Guide
9.4.2 Replacing the String Fuses (<DC fuse>)
At least one string fuse is defective. You can detect which fuse is defective using a circuit indicator.
To do so, proceed as follows:
1. Open the inverter as described in section 7.2”Opening the Inverter” (page56).
2. Observe the illustrated assignment to the strings.
3. All fuse extractors must be consecutively removed
with the string fuses.
Note the string assignment.
4. Check the conductivity using the circuit indicator.
A non-conductive fuse indicates a fault in the affected string.
5. Have the installer of the PV generator check the affected string and order the upgrade kit for
the defective string fuse from SMA Solar Technology AG (see section 12”Accessories”
(page88)).
NOTICE!
The inverter can be damaged if the string fuses burn out!
When using commercially available fuses, it cannot be ensured that they will function
correctly and in case of a fault, the fuses may burn out.
• Only use add-on kits provided by SMA Solar Technology AG.
Equip all slots with a string fuse
To ensure that the fuse monitoring function is working properly, all 5 slots must be equipped
with the appropriate fuses at all times. This also applies if fewer strings are connected!
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