Replacement Of Ast Assembly; Checking The New Assembly - SMA NR-PL-ACRLY5-01 Instrucciones Para La Sustitución

7 Replacement of AST assembly

Procedure:
1. Check the marked area and the area around both
transformers for visible dirt before mounting the
assembly. If dust or other deposits cover the
assembly, it must not be used. Contact the Service.
2. Align the assembly and insert it into the inverter. Touch the assembly only at the handling
areas. Ensure that the spacers match the holes in the mounting plate and that the cable is not
trapped beneath the assembly.
3. Tighten the mounting plate connecting screws (TX20, torque: 3.5 Nm (31.0 in-Ib).
4. Insert the cables (1 black, 1 green, 1 grey, 1 white, 1 red, 1 purple and 2 blue) into the
terminals on the assembly and ensure that all cables are tight.
5. Plug all plugs into the assembly and ensure that all cables are connected correctly and are
securely in place.
6. Tighten the AC connection screws (TX20, torque: 6.0 Nm (53.1 in-lb)). Ensure the correct
position when doing so (BK = black, GY = grey, BN = brown).
7. Ensure that all connections for the replaced assembly have been made correctly.
8. Position the enclosure lid on the AC-Connection Unit and first tighten the upper-left and lower-
right screws, and then the remaining screws crosswise (TX25, torque: 6 Nm (53 in-lb)).
9. Commission the inverter (see Section 8, page 24).
7 Replacement of AST assembly
7.1

Checking the New Assembly

To ensure that the replacement of the assembly can be performed, the status of the new assembly is
to be checked prior to removal of the defective assembly.
Procedure:
1. Carefully remove the assembly upwards out of the packaging. When doing so, ensure that the
thermal grease is not damaged or contaminated.
2. Check the pattern of thermal grease on the rear of the assembly for damage and impurities.
3. If the pattern of thermal grease on the rear side of
the assembly shows evidence of damage, the
assembly must be replaced. If small impurities (see
image) are present, these can be carefully removed
using a pointed tool. The pattern must not be
destroyed when doing so.
4. Lay the assembly in the packaging until use.
18 STP50-ACRLY-AST-RM-xx-10
SMA Solar Technology AG
Replacement Manual