SMA SC 500CP-US-10 600V - Manual (Page 35)

SMA America, LLC 3 Product Description
Operating Manual SCCP-US-BE-US_en-52 35
resistance falls below the error threshold in another operating state, the error is not ignored and the inverter does
not go into feed-in operation. The error message 3501 ‒ Insulation error appears on the touch display. The LEDs
ALARM1 and ALARM2 are glowing.
Insulation monitoring
The insulation monitoring device will start measuring once the GFDI is open. The device will initially assume that the
insulation is poor. If the parameter IsoErrIgn is set to Off, the inverter will switch off temporarily.
After approximately five minutes, the insulation monitoring device will have determined the correct insulation resistance
and the value of the insulation resistance can be viewed on the display of the insulation monitoring device. If the insulation
is intact, the inverter switches back to the operating state "MPP load operation". If the insulation monitoring process is
complete, the GFDI should be closed again and thus allow the PV array to operate with a grounded connection.
If, after approximately five minutes, one of the errors 3501 ‒ Insulation Failure, 3504 ‒ Insulation failure ignored,
or 3601 ‒ Warning insulation failure is displayed, then the insulation is defective. In this case, an electrically qualified
person needs to check and, if necessary, repair the insulation and then acknowledge the error.
Type of insulation monitoring device used
The insulation monitoring device used is the A-ISOMETER iso-PV1685 device supplied by Bender GmbH & Co. KG.
3.6.4.2 Advanced Remote GFDI and Insulation Monitoring Device
With the "Advanced Remote GFDI and Insulation Monitoring US" order option, it is possible to temporarily disable the
PV array grounding and to check the insulation via the integrated insulation monitoring device.
Figure 13: Advanced Remote GFDI in the inverter
When the remote GFDI is closed, the PV array is grounded. In this state, the insulation resistance cannot be determined.
The Advanced Remote GFDI opens in the event of:
• Disturbance, e.g. ground faults
• Manual activation of the plant maintenance
• Automatic plant maintenance
Each switching process of the Advanced Remote GFDI is counted in the CntGfdiSw instantaneous value.
Disturbance
If a ground fault occurs, the inverter opens the Advanced and stops the feed-in operation. The AC and DC switching
devices are opened. The inverter displays the error 3502 - Ground Fault Detected. After a waiting time of
approximately 15 minutes has expired, the insulation monitoring is activated.
You must close the Advanced Remote GFDI manually via the parameter RemMntSvc or the key switch(see
Section 10.1.3, page 76). To be able to do this, all errors must be confirmed.