Output Overcurrent Detection - Daikin FTX-N Series Service Manual

SiUS091601EA

7.15 Output Overcurrent Detection

L5
Error Code
Method of Error
An output overcurrent is detected by checking the current that flows in the inverter DC section.
Detection
Error Decision  A position signal error occurs while the compressor is running.
Conditions  A rotation speed error occurs while the compressor is running.
 An output overcurrent signal is fed from the output overcurrent detection circuit to the
 If the error repeats, the system is shut down.
 Reset condition: Continuous run for about 11 minutes without any other error
Supposed
 Poor installation condition
Causes  Closed stop valve
 Defective power module
 Wrong internal wiring
 Abnormal power supply voltage
 Defective outdoor unit PCB
 Power supply voltage out of specification
 Defective compressor
Troubleshooting
Part 6 Service Diagnosis
microcomputer.
Be sure to turn off the power switch before connecting or disconnecting
Caution
connectors, or parts may be damaged.
* An output overcurrent may result from wrong internal wiring. If the system is interrupted by an output
overcurrent after the wires have been disconnected and reconnected for part replacement, check the
wiring again.
Check No. 17
Check the installation condition.
Stop valve fully open?
YES
Turn off the power. Then, turn on
the power to restart the system.
See if the same error occurs.
Error again?
YES
Turn off the power and disconnect
the harnesses U, V, and W.
Check No.15
Check with the inverter analyzer.
A Go to the next page
NO
NO
Monitor the power supply voltage,
discharge and suction pressures,
and other factors for a long term.
Possible causes
* Momentary drop of power supply
voltage
* Compressor overload
* Short circuit
* Inverter analyzer:
RSUK0917C
Troubleshooting for Outdoor Unit
Fully open the stop valve.
Not a malfunction.
Keep observing.
Check the connectors and
other components.
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