Daikin FTK25JV1NB Manual page 86

Si-86.book Page 78 Friday, June 23, 2000 10:26 AM
Check
Power Transistor Output Check (CHEK 4)
6.1.2
Check No.4
Measure the output current and voltage of the power transistor.
Output Current
Remove the front panel, and measure the current in the red, yellow and blue wire harness inside the
Measurement
compressor using a clamp meter.
1. Attach the clamp meter to the red, yellow and blue wire harness, and conduct forced cooling operation.
2. When the output frequency has stabilized, measure the output current of each phase.
3. If the current outputs of all the phase are balanced, it is normal.
4. If even one phase is out of balance, replace the outdoor unit PCB.
5. If the compressor stops before the output frequency stabilizes, measure the output voltage.
Output Voltage Remove the front panel, and disconnect the red, yellow and blue wire harness inside the compressor from
Measurement the terminals. Measure the output voltage of the red, yellow and blue wires using a tester.
1. Conduct forced cooling operation with the equipment in the condition shown in Fig.1.
2. Measure the voltage between the operation start (when the outdoor unit fan starts rotating) to operation
3. Reset the power, and repeat steps (1) to (3) for each phase of U-V, V-W and W-U.
4. If the voltages of all the phases show results similar to the solid line in the graph shown in Fig.2, the
5. If the voltage of even one phase deviates from the solid line shown in Fig.2, conduct the following test.
[Fig.1]
Note: 1. Do not touch the terminals of the red, yellow and blue wires when the power is supplied.
2. Do not short-circuit the terminals of the red, yellow, and blue wires.
78
halt caused by an CT error (about 15 seconds).
outdoor PCB is normal.
Check the harness between the power transistor and compressor (check items: breaking of wire and
wiring errors). If the harness is normal, replace the PCB..
(Touching them is very dangerous since a voltage of over 100V is applied.)
SIE-86
[Fig.2]
Service Diagnosis