Cleaning The Interior; Checking The Fuses - SMA SUNNY CENTRAL 500CP-US/CA Maintenance Manual

SMA America, LLC

7.5 Cleaning the Interior

1.
Danger to life due to electric shock or electric arc by touching live components
• Disconnect the inverter and wait 15 minutes until the capacitors have discharged completely (see Section 6).
2. Open the inverter.
3. Ensure that the switch cabinet is sealed.
4. Remove dirt and dust from the interior of the switch cabinet and from all assemblies (e.g. DC load-break switch and
AC circuit breaker).
5. Remove moisture.
6. Check for leaks. If leaks are present, fix the leaks.
7. Close the inverter.

7.6 Checking the Fuses

Damage to screw connections from over-tightening
• Only tighten loose connections applying the prescribed torque. Torque specifications are shown in the circuit
diagram of the inverter. Contact the SMA Service Line if specifications are missing.
Procedure:
1.
Danger to life due to electric shock or electric arc by touching live components
• Disconnect the inverter and wait 15 minutes until the capacitors have discharged completely (see Section 6).
2. Open the interface cabinet.
3. Check whether screw connections are loose.
If screw connections are loose, tighten them with the prescribed torque. Torque specifications are shown in the circuit
diagram of the inverter. Contact the SMA Service Line if specifications are missing.
4. Check the fuses or tension springs for discoloration and signs of wear.
If the fuses or tension springs are discolored or show signs of wear, replace them.
5. Check the insulation and terminals for discoloration and signs of wear.
If the insulation or terminals are discolored or show signs of wear, contact the SMA Service Line.
6. Close the interface cabinet.
Maintenance Manual
7 Maintenance in Disconnected State
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