Midea M2OC1-18HRDN1-Q

8.3.2.9 IPM module protection
IPM module protection
Check whether the voltage range of P-N on
IPM module is normal? DC277-356V for
14-27KBtu/h; DC277-410V for 36KBtu/h
No
Check whether the input power supply
is correct? 220-240V, 1N, 50Hz
No
Regulate it to correct,
then check whether the
system can work
normally?
Yes
Check whether the power
supply line is connected
correctly and tightly
No
Connect it correctly and
tightly, check ok or not?
No
Yes
Check whether the lines in
E-part box are connected tightly
No
Connect it tightly,
check ok or not?
No
Yes
Check whether the single-phase bridge is
normal? Use the multimeter to measure the
resistance between each two terminals, check
whether there is the condition that value of
resistance is 0
Yes
Replace the
single-phase bridge
No
No
Check whether the connecting line
of every reactor is normal? If the
line is broken, the resistance of the
two ports is ∞（models except for
M5OA-36HRDN1-Q）；Check
whether the PFC module
broken(for M5OA-36HRDN1-Q)
Yes
Replace the
connecting line or
reactor or replace
the PFC module
Yes
Check whether the connecting line
between main board and the IPM
module is connected tightly
Yes
Check whether the connecting
line of the compressor is
connected correctly or tightly
Yes
Replace the IPM module, check
whether the system can work
normally?
No
Replace the main board, check
whether the system can work
normally?
Yes
Trouble is solved
Replace the compressor, check
whether the system can work
normally?
Connect it tightly,
check ok or not?
No
No
Yes
Trouble is solved
No
No
Yes
Trouble is solved
Connect it well,
check ok or not?