The phenomena from main component failure
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n
Inverter compressor
M chiller is composed of 2 inverter scroll compressors.
If occurring an error regarding a compressor and power while operating, please check and confirm following an order below.
How long has the power supplied before
an operation?
Items to be confirmed
Symptom
Treatment
1) The compressor stops and
same error appears again.
1) When supplying for 12
hours or more than that
2) When supplying for less
than 12 hours
2) If output voltage of the
inverter is stably output. *1
3) If output voltage of the
inverter is unstable or it is
0V. (When incapable of
using a digital tester)
• Please confirm whether or not IPM is failed.
• Please go to number 2.
• Please permit the power for a designated time
(12 hours) and then go to number 2.
* Check coil resistor and insulation resistor. If
normal, restart the unit. If same symptom
occurs, replace the compressor.
* Insulation resistor: 50 MΩ or more
* Coil resistor (below table)
* Check the IPM.
If the IPM is normal, replace the inverter board.
* Check coil resistor and insulation resistor.
*1 [Matters that require attention when measuring a voltage and current of an inverter power circuit]
The measured value can differ depending upon measurement equipment and a measurement circuit.
Especially, an output voltage of an inverter has an pulse type pattern, the output frequency is also changed.
Additionally, the measured value greatly differs depending upon measurement equipment.
1) When checking whether or not an output voltage of an inverter is consistent, (When comparing the relative voltages between
the lines) if a portable tester is used, please be sure to use an analog tester. Please keep in mind especially in case of hav-
ing a low inverter output frequency, using a portable tester, having a large change of measured voltage value between differ-
ent lines, appearing an imaginary same value actually, and having a risk judging as an inverter failure.
2) When measuring an output voltage value of an inverter (When measuring an absolute value), if a commercial frequency
measurer is used, a rectification voltmeter (
) can be used. An accurate measured value can't be obtained by using a
regular portable tester.
(Both analog and digital)
Does failure appears again when starting
operation?
Method to measure insulation resistance
Method to measure coil resistance
Pipe
Tester
Comp.
Figure 1.
Tester
Comp.
Figure 2.
JQC068MA*
Temp.
25 ℃
75 ℃
U-V
0.216±7% Ω
0.258±7% Ω
V-W
0.216±7% Ω
0.258±7% Ω
W-U
0.216±7% Ω
0.258±7% Ω