Toyotomi CCT 50HINVi Service Manual page 66

2.4.4.15. P6 malfunction (For three phases units)
At first test the resistance between every two ports of U, V, W of IPM and P, N. If any result of them is 0 or
close to 0, the IPM is defective. Otherwise, please follow the procedure below:
P6 display
IPM module protection
Check whether the voltage
range of P-N on IPM module is
normal? DC 350-650V
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?
No
Replace the compressor,
check whether the system
can work normally?
Yes
Electrical Control System
No
Connect it tightly,
No
check ok or not?
No
Connect it well,
No
check ok or not?
No
Yes
Yes
Trouble is solved
Check whether the
input power supply is
No
correct? 380-415V, 3N,
50Hz
No
Yes
Check whether the
power supply line is
connected correctly
and tightly
Yes
Check whether the
lines in E-part box are No
connected tightly
Yes
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
Yes
Yes
Check whether the 3300μF/400V
electrolytic capacitor is normal?
Troubleshooting
Regulate it to correct,
then check whether the
system can work
normally?
Connect it correctly
No and tightly, check ok
or not?
No
Connect it tightly,
check ok or not?
No
No
Replace the bridge rectifiers
No
Replace this electrolytic
capacitor
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