Mitsubishi Electric PEA-RP200WKA Service Manual page 35

(4) Simple check on the main inverter circuit components
* Turn off the power supply, take the following components out of the control box, and then check the components.
Parts name
Diode bridge
Inrush current limiting resistor R
AC reactor (ACL)
Current sensor ACCT
THHS sensor
(5) Troubleshooting the diode bridge
Measure the resistance between terminals of the diode bridge with a tester, and use the measured value for troubleshooting.
Read before taking measurements.
- Check the polarity before taking measurements. Black is positive on a regular multimeter when it is used to
measure resistance.
- Check that the circuit is not completely open (
- These resistance measurement values are provided only as a guide, and small deviations from these values
are allowed.
- If the resistance between a given terminal and other terminals all fall within a range of minus 50% and plus
100%, the resistance is normal.
Tester restrictions
- Use a tester that has an internal voltage supply of 1.5 V or greater.
- Use a dry-battery-powered tester.
(An accurate diode resistance measurement cannot be obtained with a button-battery-operated card tester
because of its low applied voltage.)
- Use a tester that can measure in small increments.
It will allow for more accurate measurement.
External view
+
~
(L)
Internal circuit diagram
L
N
Evaluation criteria
Refer to (5) Troubleshooting the diode bridge.
Measure the resistance between terminals. : 22 Ω ± 10 %
Measure the resistance between terminals. : 1 Ω or less
Measure the resistance between the terminal and the chassis. :
Disconnect the CNCT2 connector, and check the resistance between the terminals.
: 580 Ω ± 30 Ω
Disconnect the connector CNTH, and measure the resistance between connector terminals.
Check that the terminals are not short-circuited (0 Ω) or open-circuited (∞ Ω).
Ω) or short-circuited (-0 Ω).
<Reference values for resistance check>
~
(N)
+
-
~
(L)
-
~
(N)
+
-
+ -
5~200 Ω
5~200 Ω
33
~ ~
(L) (N)
5~200 Ω 5~200 Ω