Kaisai KOU-12HDN1 Service Manual page 126

Troubleshooting
14. P6 malfunction (For three phases units)
P6 display
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 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?
122
No
Check whether the input power supply
is correct? 380-415V, 3N, 50Hz
Connect it tightly,
check ok or not?
No
Connect it tightly,
check ok or not?
No
Check whether the three phase bridge
Yes
Trouble is solved
Check whether the 3300µF/400V
electrolytic capacitor is normal?
Yes
Trouble is solved
Yes
Trouble is solved
Yes
Check whether the power
supply line is connected
correctly and tightly
Yes
Check whether the lines in
E-part box are connected tightly
Yes
is normal?
Yes
MLCAC-UTSM-2010-10
Regulate it to correct,
then check whether the
No
system can work
normally?
No
Connect it correctly and
tightly, check ok or not?
No
Connect it tightly,
check ok or not?
No
Replace the three phase
bridge
No
Replace this electrolytic
capacitor
Outdoor Units
No
No
No