SMA SC 500CP-US Maintenance Manual - Manual (Page 47)

SMA America, LLC 9 Maintenance when Control Voltage is Present
Maintenance Manual SCCP-US-WH-US_en-30 47
Context:
The Integrated DC Switch option consists of a control actuator switch on the inverter door, red and green indictor lights
on the inverter door, and two motor driven DC load-break switches inside the inverter. This proceedure tests the correct
operation of each of these components.
Proceedure:
1. Verify that the Integrated DC Switch control actuator switch on the inverter door is in the ON position, and that the
green CLOSED indicator light is illuminated.
2. Switch the key switch of the inverter to Stop.
3. Check whether the red OPEN indicator light on the inverter door is illuminated, indicating that the DC load-break
switches are open.
4. Open the doors of the interface cabinet.
5. Check whether the DC load-break switches are both indicating the Off position. If either of the DC load-break
switches are not indicating the Off position, contact the SMA Service Line.
6. Close the doors of the interface cabinet.
7. Switch the key switch of the inverter to Start.
8. Check whether the green CLOSED indicator is illuminated, indicating that the DC load-break switches are closed.
9. Open the doors of the interface cabinet.
10. Check whether the DC load-break switches are indicating the On position. If the DC load-break switches are not
both indicating the On position, contact the SMA Service Line.
11. Switch the Integrated DC Switch control actuator switch on the inverter door to OFF.
12. Check whether the DC load-break switches are both indicating the Off position. If either of the DC load-break
switches are not indicating the Off position, contact the SMA Service Line.
13. Check whether the red OPEN indicator light on the inverter door is illuminated, indicating that the DC load-break
switches are open.
14. Test the switching process three times. Check each time whether the DC load-break switches have switched.
15. Close the doors of the interface cabinet.