Input Overcurrent Detection - Daikin FTXS30HVJU Service Manual

SiUS04-924

4.12 Input Overcurrent Detection

E8
Remote
Controller
Display
Method of
An input overcurrent is detected by checking the input current value being detected by CT with the
Malfunction compressor running.
Detection
 The following CT input with the compressor running continues for 2.5 seconds.
Malfunction
Decision
 The system will be shut down if the error occurs 16 times.
Conditions
 Clearing condition : Continuous run for about 5 minutes (normal)
 Overcurrent due to compressor failure
Supposed
 Overcurrent due to defective power transistor
Causes
 Overcurrent due to defective inverter main circuit electrolytic capacitor
 Overcurrent due to defective outdoor unit PCB
 Error detection due to outdoor unit PCB
 Overcurrent due to short-circuit
Troubleshooting
Check No.07
Refer to P.109
Check No.08
Refer to P.109
Service Diagnosis
CT input : Above 20 A
Be sure to turn off the power switch before connecting or disconnecting
Caution
the connector, or parts damage may occur.
* An input overcurrent may result from wrong internal wiring. If the wires have been disconnected and
reconnected for part replacement, for example, and the system is interrupted by an input over-current,
check the wires again.
Get restarted and measure the
input current.
Input current flowing
above its stop level?
YES
Turn off the power and disconnect
the harnesses U, V and W.
Check with the inverter checker (*).
Any LED off?
NO
Turn off the power, and reconnect
the harnesses. Turn on the power
again and get restarted.
Check No. 08
Check the discharge pressure.
Check No. 07
Check the installation condition.
NO
YES
Troubleshooting
Replace the outdoor unit
PCB.
* Inverter checker
Part No.: 1225477
Correct the power supply or
replace the PM1.
(Replace the outdoor unit
PCB.)
(R9298)
85