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Mitsubishi Electric PURY-P72 Service Handbook page 337

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Table of Contents
[ IX Troubleshooting ]
[YKMU-A]
(5) Simple checking procedure for individual components of main inverter circuit
Before inspecting the inside of the control box, turn off the power, keep the unit off for at least 10 minutes, and confirm that
the voltage between FT-P and FT-N on INV Board has dropped to DC20V or less.
Part name
IGBT module
See "Troubleshooting for IGBT Module ". (IX [4] -7- (6))(page 328)
Rush current pro-
Measure the resistance between terminals R1 and R5: 22 ±10%
tection resistor
R1, R5
Electromagnetic
relay
72C
DC reactor DCL
Measure the resistance between terminals: 1 or lower (almost 0 )
Measure the resistance between terminals and the chassis:
(6) Troubleshooting for IGBT Module
Measure the resistances between each pair of terminals on the IGBT with a tester, and use the results for troubleshooting.
The terminals on the INV board are used for the measurement.
1) Notes on measurement
ŒCheck the polarity before measuring. (On the tester, black normally indicates plus.)
ŒCheck that the resistance is not open (
ŒThe values are for reference, and the margin of errors is allowed.
ŒThe result that is more than double or half of the result that is measured at the same measurement point is not allowed.
ŒDisconnect all the wiring connected the INV board, and make the measurement.
2) Tester restriction
ŒUse the tester whose internal electrical power source is 1.5V or greater
ŒUse the dry-battery-powered tester.
(The accurate diode-specific resistance cannot be measured with the button-battery-powered card tester, as the applied volt-
age is low.)
ŒUse a low-range tester if possible. A more accurate resistance can be measured.
HWE1116D
This electromagnetic relay is rated at DC12V and is driven by a coil.
Check the resistance between terminals
Upper
1
2
3
4
Installation
direction
6
5
) or not shorted (to 0 ).
Judgment method
Check point
Coil
Between Terminals 5 and 6
Between Terminals 1 and 2
Contact
Between Terminals 3 and 4
- 328 -
Checking criteria( )
W
Not to be short-circuited
(Center value 75 ohm)
GB
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