7
Replacing the Varistors
Proceed as follows to replace each varistor.
Procedure:
1.
Danger to life due to high voltages
• Disconnect the inverter from all voltage sources (see Section 2.2, page 7).
2. Loosen the screws on the upper enclosure lid using an Allen key (AF 4) and remove the
enclosure lid.
3. Position the insertion tool into the clamping
contacts of the connecting terminal plate.
4. Remove the varistor from the connecting terminal plate.
5. Insert the new varistor into the connecting
terminal plate. The labeling on the varistor must
point left to the enclosure.
6. Remove the insertion tool from the clamping contacts of the connecting terminal plate.
7. Position the upper enclosure lid with the five
screws and conical spring washers on the
enclosure and tighten it using an Allen key
(AF 4) in the order 1 to 5 (torque: 6 Nm ± 0.3
Nm). The teeth on the conical spring washers
must face the enclosure lid.
8. Recommission the inverter (see Section 8, page 25).
7 Replacing the Varistors
SMA Solar Technology AG
Service Manual
SB30-60TL-21-SG-en-11
24
Summary of Contents for SUNNY BOY 3000TL Single Tracker
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