E9 to E28 NKR Service Manual.pdf - Industrial Air
E9 to E28 NKR Service Manual.pdf - Industrial Air
E9 to E28 NKR Service Manual.pdf - Industrial Air
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16.4.29 F99 (Output Over Current Detection)<br />
Malfunction Decision Conditions<br />
During operation of cooling and heating, when an output over-current (DC peak current value at IPM Prevention<br />
Control) is detected by checking the current that flows in the inverter DC peak sensing circuitry.<br />
Malfunction Caused<br />
Faulty outdoor unit PCB<br />
Faulty compressor<br />
Troubleshooting<br />
Checking the power transis<strong>to</strong>r<br />
Never <strong>to</strong>uch any live parts for at least 10 minutes after turning off the circuit breaker.<br />
If unavoidable necessary <strong>to</strong> <strong>to</strong>uch a live part, make sure the power transis<strong>to</strong>r’s supply voltage is below 50V using<br />
the tester.<br />
For the UVW, make measurement at the Fas<strong>to</strong>n terminal on the board of the relay connec<strong>to</strong>r.<br />
Tester’s negative terminal Power transis<strong>to</strong>r (+) UVW Power transis<strong>to</strong>r (-) UVW<br />
Tester’s positive terminal UVW Power transis<strong>to</strong>r (+) UVW Power transis<strong>to</strong>r (-)<br />
Normal resistance Several kΩ <strong>to</strong> several MΩ<br />
Abnormal resistance 0 or ∞<br />
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