Inverter Checker" Check - Daikin E Series Service Manual

Check
3.8

"Inverter Checker" Check

Check No.14 1. Characteristics
If abnormal stop occurs due to compressor startup failure or overcurrent output when using
inverter unit, it is difficult to judge it results from the compressor failure or other failure (control
PC board, power transistor, etc.). The inverter analyzer makes it possible to judge the cause of
trouble easily and securely. (Connect this analyzer as a quasi compressor instead of
compressor and check the output of inverter)
2. Operation Method
1) Be sure to turn the power off.
2) Install the Inverter Analyzer instead of a compressor.
Note: Make sure the charged voltage of the built-in smoothing electrolytic capacitor drops to 10
VDC or below before carrying out the service work.
Reference
If the connector terminal of compressor is not a faston terminal (difficult to remove the wire on
the terminal), it is possible to connect a wire available on site to the unit from output side of PC
board. (Do not connect it to the compressor at the same time, otherwise it may result in incorrect
detection.)
3) Turn the power on and operate the air conditioner.
3. Diagnose method (Diagnose can be made according to 6 LEDs lighting status as
(1) When all LEDs are lit uniformly, → Compressor malfunction (to be replaced)
(2) When some of LEDs are not lit (LEDs are not lit or go off, etc.):
∗ When the power transistor and control PC board are integrated :
∗ When the power transistor can be checked individually :
If NG : → The power transistor may have a failure. (Replace the power transistor).
If the power transistor is normal, check if there is any solder cracking on filter PC board.
∗ If any solder cracking is found: → Replace the filter PC board (or repair the soldered
∗ If filter PC board is normal: → Replace the control PC board.
206
(1) Remove the faston terminals
from the terminal block of
the compressor.
Compressor
follows:)
Check the individual power transistor. (Refer to check No.15)
→ Replace the control PC board.
↓ Check the resistance value. (Refer to check No.15)
section).
(2) Connect the faston terminals
to the terminals of the Inverter
Analyzer.
Be careful not to touch the terminals
(U,V,W)each other. Otherwise, high voltage is
applied.
SiBE04-624
Inverter Analyzer
(R5160)
Service Diagnosis