SMA Solar Technology AG
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. Use a magnifying glass to ensure that the
honeycomb pattern on the edge of the thermal
grease has not dried out. Dehydration can be
recognized by the fact that the combs appear very
flat and sometimes two-colored. An intact viscosity
can be recognized by a perceptible honeycomb
height.
5. If the honeycomb pattern of the thermal grease has
dried out, do not use the supplied assembly.
6. If the assembly is not damaged, contaminated or dried out, place the assembly in its
packaging until it is ready for use.
7.2
Removing the DST Assembly
Requirements:
☐ The pattern of thermal grease must be undamaged and free from impurities (see Section 7.1,
page 18).
Procedure:
1. Disconnect the inverter from all voltage sources (see Section 5, page 12).
2. Remove the DC EMV assembly (see Section 6.1, page 14).
Replacement Manual
7 Replacing the DST Assembly
STP50-DC-EMV-DST-RM-xx-12
19