Checking The Surge Arresters - SMA MEDIUM VOLTAGE POWER STATION 500SC-JP System Manual

10 Maintenance
Damage to bolted connections through overtightening
If the permitted torques are exceeded, bolted connections can be damaged. In this case, fault-free operation of the
inverter is no longer ensured.
• Only tighten loose bolted connections to the prescribed torque. Torque specifications are indicated in the circuit
diagram of the inverter. If there is any information missing, contact (see Section 17 "Contact", page 256).
Procedure:
1. Check that the bolted connections of all assemblies are securely in place.
If bolted connections are loose, tighten them using a torque wrench.
2. Check whether all bolted connections of the power cabling are securely in place.
If bolted connections are loose, tighten them using a torque wrench.
3. Check the insulation and connections for any discoloration or change in appearance.
If insulation and connections are discolored or changed, contact us (see Section 17 "Contact", page 256).
4. Check the bolted connections for damage and contact elements for corrosion.
If bolted connections are damaged or contact elements corroded, replace them.

10.5.6 Checking the Surge Arresters

Figure 43: Position of the surge arresters
Position Designation
A Ready indicator
Additionally required maintenance material (not included in the scope of delivery):
☐ A surge arrester testing device approved by the manufacturer of the surge arrester such as the PM20 by DEHN +
SÖHNE GmbH + Co. KG.
148 MVPS22JP-SH-en-11
SMA Solar Technology AG
System Manual