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[8-10 Troubleshooting Inverter Problems (TKMU) ]
8-10-13
Simple Check on Inverter Circuit Components
Turn off the power of the unit and leave it turned off for 10 minutes. Check that the voltage of the electrolytic capacitor (inverter
main circuit) is 20 VDC or below. Then, remove the relevant parts from the control box.
Before checking, turn the power off and remove the parts to be checked from the control box.
Part name
Diode stack
Refer to the following page(s). [8-10-15 Troubleshooting Problems with Diode Stack](page 297)
IPM (Intelligent
Refer to the following page(s). [8-10-14 Troubleshooting Problems with Intelligent Power Module](page
power module)
296)
Rush current
Measure the resistance between the + terminal on the diode stack and terminal TB31. (*Can be mea-
protection resis-
sured without the need to remove the noise filter board): 22 Ω±10%
tor
R1(R2)
Electromagnetic
relay
This electromagnetic relay is rated at 200VAC and is driven by a coil. The resistance between the
72C
coils in row A cannot be measured with a tester.Check only for shorting.
Test button
DC reactor DCL
Measure the resistance between terminals: 1 Ω or lower (almost 0 Ω)
Measure the resistance between terminals and the chassis:
Current sensor
Disconnect the CNCT2 connector and measure the resistance between terminals: 280 Ω± 30 Ω
ACCT
1 - 2 PIN (U-phase),3 - 4 PIN (W-phase)
HWE13080
Judgment method
Installation direction
Row
Row
Row
Row
Row
A
B
C
D
E
A2
44 34 24 14
A1
43 33 23 13
W
W
ACCT-W
*Check the ACCT connection phase and the
direction of the connection
- 295 -
Check point
Between No. 1 pin and
Coil
No. 3 pin of the CN03 on
Not to be short-circuited
the noise filter board
With the test button
+ terminal on the diode
Contact
stack and terminal
With the test button
TB31 on the noise filter
IPM
U
V
ACCT-U
U
Checking criteria
turned off :
turned on : 0
GB
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Troubleshooting
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Do you have a question about the PURY-HP72 and is the answer not in the manual?
Questions and answers
what is the set up mode for recovery, and charging of sys?
Why can control my indoor unit with centralize control
You may not be able to control your Mitsubishi Electric PURY-HP72 indoor unit with centralized control for the following reasons:
1. The power jumper connector on the outdoor unit may not be correctly set. It should be connected to CN40 on only one outdoor unit.
2. The central control switch (SW5-1) on the control board of all outdoor units must be set to "ON."
3. Address settings may not be correctly configured. The main indoor unit should be assigned the smallest address (e.g., IC00), and correct port number settings are required.
4. If using a remote controller alone, an interlock setting from the remote controller is needed.
5. Both ME and MA remote controllers cannot be connected to the same indoor unit group.
6. System controller power issues may occur if the outdoor unit fan rotates due to external forces, causing the system controller to detect an error.
7. Improper wiring or incorrect voltage at TB7 may also prevent operation.
Check each of these conditions to ensure proper centralized control.
This answer is automatically generated
Why can’t control indoor unit with centralize control and stay the MA control set up can’t. Control the mode
The Mitsubishi Electric PURY-HP72 indoor unit cannot be controlled with centralized control and the mode control setup does not function due to the following reasons:
1. Central control is not possible if the indoor/outdoor transmission line is used, even if TB7 terminals are daisy-chained.
2. Shielded cables must be used, and the connection must only be made after confirming the voltage is below 20 VDC.
3. Improper connection of the transmission line for centralized control, such as not correctly daisy-chaining terminals M1 and M2 or not short-circuiting the earth and S terminals on TB7.
4. If a power supply unit is not connected to the centralized control line, the power jumper connector must be moved from CN41 to CN40 on one outdoor unit—if this is not done, mode control will not function.
5. Overlapped indoor unit addresses or noise interference on the remote controller lines can also prevent proper control.
6. Failure to set one MA remote controller to MAIN or exceeding its capacity can result in control failure.
All these factors must be correctly configured for centralized and mode control to function properly.
This answer is automatically generated