Omron KP100L-OD - 12-2010 User Manual page 96

E1-4: Under frequency (Grid)
Situation
Possible Cause
Remedy for User
Remedy for Professional
E1-5: Islanding passive
Situation
Possible Cause
Remedy for User
Remedy for Professional
Grid Connect Photovoltaic Inverter KP100L-OD- USER'S MANUAL
UF (under frequency) error due to drop of the grid frequency.
1. The detected AC frequency is under the setting of Inverter.
2. AC connection is not correct.
3. Grid condition is weak or unstable.
4. Other high-power consumption device is affecting the grid system.
5. Inverter is abnormal.
1. If this problem occurs seldom (such as 1 time a day), no action is necessary.
Operation will restart automatically when the grid voltage returns to normal.

If the problem occurs frequently, do the actions below.
2. Find the device with high power consumption near your AC system.
3. Consult your utility power supplier, understand the grid conditions.
4. Ask help of your installer.
1. Check the system connection including polarities and security first.
2. Find the devices with high power consumption near the AC system.
3. Consult the utility power supplier, understand the grid conditions.
4. Use Inverter software to monitor the frequency and voltage.
5. If the situation is not improved, please replace the Inverter.
Islanding operation detected by passive method due to error in the power from the grid.
1. AC connection is not correct.
2. Grid condition is weak or unstable.
3. Other high-power consumption device is affecting the grid system.
4. Inverter is abnormal.
1. If this problem occurs seldom (such as 1 time a day), no action is necessary.
Operation will restart automatically when the grid voltage returns to normal.

If the problem occurs frequently, do the actions below.
2. Find the device with high power consumption near your AC system.
3. Consult your utility power supplier, understand the grid conditions.
4. Ask help of your installer.
1. Check the system connection including polarities and security first.
2. Find the devices with high power consumption near the AC system.
3. Consult the utility power supplier, understand the grid conditions.
4. Use Inverter software to monitor the frequency and voltage.
5. If the situation is not improved, please replace the Inverter.
4 Maintenance Operations
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