Omron KP100L-OD - 12-2010 - Page 96

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4 Maintenance Operations
Grid Connect Photovoltaic Inverter KP100L-OD- USER’S MANUAL
4-2 Remedy for errors
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9
E1-4: Under frequency (Grid)
E1-5: Islanding passive
Situation UF (under frequency) error due to drop of the grid frequency.
Possible Cause
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.
Remedy for User
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.
Remedy for Professional
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.
Situation Islanding operation detected by passive method due to error in the power from the grid.
Possible Cause
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.
Remedy for User
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.
Remedy for Professional
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.