[8-9 Troubleshooting Inverter Problems ]
- 241 -
HWE12050 GB
8 Troubleshooting Based on Observed Symptoms
8-9-13 Simple Check on Inverter Circuit Components
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.
8-9-14 Troubleshooting Problems with 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
Check the polarity before measuring. (On the tester, black normally indicates plus.)
Check that the resistance is not open ( ) or not shorted (to 0 ).
The values are for reference, and the margin of errors is allowed.
The result that is more than double or half of the result that is measured at the same measurement point is not allowed.
Disconnect all the wiring connected the INV board, and make the measurement.
2) Tester restriction
Use the tester whose internal electrical power source is 1.5V or greater
Use 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.)
Use a low-range tester if possible. A more accurate resistance can be measured.
Part name Judgment method
IGBT module Refer to the following page(s). [8-9-14 Troubleshooting Problems with IGBT Module](page 241)
Rush current pro-
tection resistor
R1, R5
Measure the resistance between terminals R1 and R5: 22 ±10%
Electromagnetic
relay
72C
This electromagnetic relay is rated at DC12V and is driven by a coil.
Check the resistance between terminals
DC reactor DCL Measure the resistance between terminals: 1 or lower (almost 0 )
Measure the resistance between terminals and the chassis:
1
65
234
Upper
Installation
direction
Check point
Checking criteria( )
W
Between Terminals 5 and 6
Between Terminals 1 and 2
Between Terminals 3 and 4
Not to be short-circuited
(Center value 75 ohm)
Coil
Contact
To Next Page
Loading...
