Carrier X-POWER Series - Page 153

Carrier service manual R410A DC Inverter Series
Troubleshooting 171
4.7 xH0/H1
xH0: Communication error between DSP and the main chip (Display on faulty unit, all the ODU in
standby
H1: Communication error between 0537 and main chip (Display on faulty unit, all the ODU in
standby)
IR341 chip: IR 341chip is used for inverter compressor drive.
0537 chip: 0537chip is used for control the communication between indoor unit and outdoor unit, and the
communication between outdoors.
MC9S08AC128 chip: MC9S08AC128 chip is the main chip, it used for the whole system control.
Note:
1. How to check whether power supply for 25(CN12), 28(CN15) and 32(CN19) terminals are abnormal
①
The voltage input for 25(CN12) and 28(CN15) terminals are both 208-230V, the voltage input between “GND” and “+5V”
terminals of 32(CN19) port is 5V, and between “GND” and “+12V” terminals of 32(CN19) port is 12V.
2. How to check whether the transformer on PCB is disabled
②
The voltage input for 25(CN12) and 28(CN15) terminals are both 208-230V, the voltage output of 25(CN12) terminal is AC9V
(yellow-yellow) and AC13.5V (brown-brown); the voltage output of 28(CN15) terminal is AC14.5V (yellow-yellow) and AC 16V
(blue-blue). If the voltage is out of the range, the transformer is disabled.
H0/H1
Power supply for 25(CN12), 28(CN15)
and 32(CN19) terminals are abnormal
①
The transformer on PCB is disabled
②
Remove the interference
Outdoor main control board
is damaged
Yes
No
No
No
Yes
There has electromagnetic interference
nearby the unit. Such as High-frequency
transmitter or other high strength radiation
device
Replace the transformer
Provide normal power supply
Yes
Yes
CN15: Power output for No.2
transformer
CN12: Power output for No.1
transformer
CN19: Power supply for PCB
Replace the outdoor
main control board