SMA SC 500HE-20 Installation - Manual (Page 59)

SMA Solar Technology AG 12 Commissioning
Installation Manual SCxxxHE-20-IA-IEN111210 59
12.3 Checking the Inverter Voltage
12.3.1 Checking the DC Voltages
1. Measure the DC voltage for each input and record in the Commissioning Report. To do this, use
the DC+ and DC— terminal lugs in the connection area as measuring points.
2. Compare the DC voltages.
☑ The voltages are approximately the same and do not exceed the maximum DC voltage of
the inverter.
✖ The voltages deviate from each other and exceed the maximum DC voltage of the inverter.
• Ensure that the cabling has been executed in accordance with the circuit diagram.
3. Check that the polarity of each input is correct.
4. Measure the DC voltage for each plus pole to ground and record in the Commissioning Report.
To do this, use the DC+ terminal lugs and PE connection busbar as measuring points.
☑ There is a measurable voltage drop.
✖ There is no measurable voltage drop?
A ground fault has occurred.
• Eliminate the ground fault.
8"3/*/(
Danger of electric arcs if the measuring device is not properly connected.
• Ensure that the measuring device is connected correctly.
• Select the appropriate measuring range.
/05*$&
Damage to the inverter due to excessive DC voltages.
The DC voltage of the PV array must not exceed the maximum voltage of the inverter.
• V
PV
= 1 000 V / 1 100 V