18
Appendix A: FAQ (Frequently asked questions)
Sometimes, the PV system does not work normally; we recommend the following solutions for average
troubleshooting. This can help the technician to understand the problem and take a proper action.
Fault
LCD display
Possible actions
Clearable Fault
PVIsoFault
1. Check whether the inverter is earthed and test impedance
between PV (+) & (-) and the impedance must exceed
3MΩ;
2. Check whether the AC-side has contacts with earth.
Ground I Fault
1. The ground current is too high or GND connection problem
2. After cutting off the AC side connection, unplug the inputs
from the PV generator and check the peripheral AC
system.
3. After the cause is cleared, re-plug the PV panel and AC
connection, and check PV inverter status.
GridOVP
GridUVP
GridOFR
GridUFR
1. Wait for 5 minutes, if the grid returns to normal, PV inverter
automatically restarts.
2. Make sure grid voltage and frequency meet the local
specifications.
No Utility
1. Grid is not connected.
2. Check grid connection cables.
3. Check grid usability.
4. If grid is ok and the problem exists still, maybe the fuse in
the inverter is open, please call service.
Over Temperature:
INV OV Temp
BST OV Temp
AMB OV Temp
1. The internal temperature of inverter is higher than specified
normal value.
2. Find a way to reduce the ambient temperature. Or move
the inverter to a cooler environment.
3. If the problem remains, please call local service.
PV1OVP
PV2OVP
PV3OVP
PV4OVP
1. Check the open PV DC voltage, and see if it is greater than
or too close to 950VDC
2. If PV DC voltage is less than 950VDC, and the problem still
occurs, please call local service.
PV1UVP
PV2UVP
PV3UVP
PV4UVP
1. Check the open PV DC voltage, and see if it is less than
250VDC
2. If PV DC voltage is more than 250VDC, and the problem
still occurs, please call local service.
Ph Seq fault
1. Check the phase sequence if it is correct, if not, please
correct the phase sequence.
2. If the phase sequence is correct, and the problem still
occurs, please call local service.
Permanent Fault
Consistent Vac
Consistent Fac
Consistent GFCI
Consistent DCI
1. Disconnect all PV (+) or PV (-) from solar panels.
2. Wait for a few seconds.
3. After the LCD switches off, reconnect and check again.
4. If the problem remains, please call local service.
Relay failure
Summary of Contents for R3 Pro NAC20K-DT
Page 1: ...0...
Page 11: ...10 Figure 3 5 mounting the inverter...
Page 21: ...20 P N 422 00028 01...