Input Overcurrent Detection - Daikin SiBE07-618_D Service Manual Field

SiBE07-618_D

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
Malfunction the compressor running.
Detection
Malfunction
Decision
Conditions
Supposed
Causes
Troubleshooting
Check No.07
Refer to P.96
Check No.08
Refer to P.96
Check No.14
Refer to P.99
Service Diagnosis
The following CT input with the compressor running continues for 2.5 seconds.
CT input : Above 20 A
Defective compressor
Defective power module
Defective outdoor unit PCB
Short circuit
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
∗ 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 overcurrent,
take the following procedure.
Check No. 07
Check the installation condition.
Start operation 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 No. 14
Check with the inverter checker (∗).
Any LED off?
NO
Turn off the power, and reconnect
the harnesses. Turn on the power
again and start operation.
Check No. 08
Check the discharge pressure.
NO
∗ Inverter checker
Part No.: 1225477
YES
Troubleshooting
Replace the outdoor unit
PCB.
Correct the power supply or
replace the PM1.
(Replace the outdoor unit
PCB.)
(R11709)
71