Inverter Pcb Replacement Procedure - Mitsubishi Heavy Industries KX6 series Service Manual

2.5 Inverter PCB replacement procedure

¡ Since the following precaution is the important contents for safety, be sure to observe them.
WARNING and CAUTION are described as follows:
Indicates an imminently hazardous situation which will result in death or serious injury if
WARNING
proper safety procedures and instructions are not adhered to.
CAUTION
Indicates a potentially hazardous situation which may result in minor or moderate injury
if proper safety procedures and instructions are not adhered to.
¡ Securely replace PCB according to this following instruction.
If PCB is incorrectly replace, it will cause an electric shock or fire.
¡ Be sure to check that the power source for the outdoor unit is turned OFF before replace PCB,
The PCB replacement under current-carrying will cause an electric shock.
¡ After finishing PCB replacement, check that wiring is correctly connected with the PCB before power
distribution, If PCB is incorrectly replace, it will cause an electric shock or fire.
¡ Bundle the wiring so as not to tense because it will cause an electric shock.
(Note) If cut the tie, the wiring cables should be bound with new tie again.
• Exchange the inverter PCB according to the following procedure.
1. Replace the inverter PCB after elapsing 3 minutes from power OFF.
(Be sure to measure voltage (DC, AC) of three places (1. PCB voltage 2. Fan motor voltage 3. Noise filter PCB) and
check that the voltage is discharged completely. (Refer to Fig.1))
2. Disconnect all of terminals and connectors from the inverter PCB before replace the invertor PCB.
3. Replace to the new PCB.
4. Set the setting switches (JSW 10, 11) of new PCB as shown in table 1.
5. Connect all of terminals and connectors to the new PCB securely.
(Check the secure connection of terminals and connectors again)
CNA
Parts Arrangement View
Precautions for Safety
WARNING
CAUTION
CNR
CNI1
99
- -
JSW10,11
Table.1 Switch Setting
JSW10
Model
All models all OFF OFF
After elapsing 3 minutes
from power OFF
Connectors are not
half inserted
'10 • KX-SM-148
PCB012D018
B
JSW11
1 2 3 4
ON OFF OFF