Midea M2OF-18HFN1-Q - Page 52

Service manual DM16-01.01.11-01en
52 Multi DC inverter R410A. Outdoor unit
11.3.2.10 IPM module protection (ODU P6)
IPMmoduleprotection
Checkwhetherthevoltagerange
ofP‐NonIPMmoduleisnormal?
DC277‐356Vfor18‐28KBtu/h;
DC277‐410Vfor36‐42KBtu/h
Yes
Yes
No
Yes
Checkwhethertheinput
powersupplyiscorrect?
208‐230V,1N,60Hz
No No
Regulateittocorrect,then
checkwhetherthesystem
canworknormally?
Checkwhetherthe
powersupplylineis
connectedcorrectlyand
tightly
Yes
Connectitcorrectly
andtightly,checkok
ornot?
No
Checkwhethertheconnecting
linebetweenmainboardand
theIPMmoduleisconnected
tightly
Yes
Connectittightly,
checkokornot?
No
No
No
Connectitwell,check
okornot?
Checkwhethertheconnecting
lineofthecompressoris
connectedcorrectlyortightly
ReplacetheIPMmodule,
checkwhetherthesystemcan
worknormally?
No
No
Replacethemainboard;check
whetherthesystemcanwork
normally?
No
Replacethecompressor,check
whetherthesystemcanwork
normally?
Checkwhetherthelines
inE‐partboxare
connectedtightly
Yes
Connectittightly,
checkokornot?
No
No
Yes
No
Replacethebridgerectifiers
Checkwhetherthebridgerectifiersare
normal?Usethemultimetertomeasure
theresistancebetweeneachtwo
terminals,checkwhetherthereisthe
conditionthatvalueofresistanceis0
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 M4OA‐36HFN1‐
Q,M4OD‐28HFN1‐Q, M5OC‐36HFN1‐
Q）；Check whether the PFC module
broken (for M4OA‐36HFN1‐Q,M4OD‐
28HFN1‐Q, M5OC‐36HFN1‐Q,M50D‐
42HFN1‐Q)
Replacetheconnectinglineor
reactororreplacethePFC
module(forM4OC‐36HRFN1‐
M,M50D‐42HFN1‐Q)
Yes
No
No
Yes
Troubleissolved
Checkiftheoutdoorfan
runsproperlyortheoutdoor
unitventilationisgood.
No
Checkwhether theresistanceof
the fan motor is normal. If not,
replace the fan motor.
For other
models, r
efer to the solution of
fan speed has been out of
control malfunction . Find out
thecauseandhaveitsolved.
Yes
Yes
Yes