113
Check method of M-NET power circuit board
Normal
24–30 V DC?
• Correct the short circuit point on
the M-NET transmission line.
24–30 V DC?
Is the incoming main voltage
208/230 V AC ±10%?
• Check wiring.
• Replace M-NET power circuit board.
• Check breaker and incoming power supply.
• Check power circuit board.
• Check wiring.
Check the voltage between M1 and M2 on the
transmission terminal block TB3.
Disconnect the branch box - outdoor transmission wiring
from the terminal block TB3 , and check the voltage
between M1 and M2 on TB3 again.
*
To check the voltage of the parts on this board with a tester is difficult due to its location.
Test points are limited.
No
Yes
(24–30 V DC )
No
Yes
(208–230 V AC )
No
Yes
(24–30 V DC )
M-NET power circuit board check
Power circuit board
1
3
CNAC1(WHT)
Multi controller circuit board
M1 M2
CNS1
(RED)
2 1
CN102
(WHT)
TB3
4 3 2 1
208/230 V AC
±10%
NI
LI
208/230 V AC
±10%
CN1
CN2
24–30 V DC
24–30 V DC (Non-polar)
To branch box
M-NET power circuit board
L2
L1
TB1
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