Electrical Circuit And Servicing Precautions - Daikin LX10F11B3 Service Manual

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4.7 Electrical Circuit and Servicing Precautions

C/B
3 phase AC
380-415V/50Hz
440-460V/60Hz
Input to
CPU board
Output from
CPU board
Power circuit 380-415V/50Hz 440-460V/60Hz
Operation circuit AC24V
Servicing precautions
1. Power circuit
Before inspecting the primary side of circuit breaker, be sure to turn off the power for facility side.
※Even after turning off the circuit breaker, supply voltage is still applied.
2. Before inspecting the secondary side of circuit breaker, be sure to turn off the circuit breaker and
disconnect power plug.
3. Inverter circuit
To inspect inside the inverter BOX, ensure to
follow the instructions below.
① Ensure to leave the unit at least 10 minutes after
turning off the circuit breaker before opening the
cover of the inverter box.
※ This is because it takes time for the charge
accumulated in the capacitor on the inverter board
to be released after turning off the circuit breaker.
② Open the inverter box cover and, ensure that the
voltage between the terminal TP1 and TP2 on
the inverter board is lowered to DC50V or below
before starting inspection.
Control box
PT/CT
EC7
AC24V
I/O board
Tr
EC2
SV
Solenoid Valves
Inverter box
Noise filter
ACL
board EC9
4-12
CPU board
EC1
Sensors
Inverter board
EC8
AC⇒DC⇒Inverter control
DC400-710V
(When stopped) Max. 460×1.1× 2=713V
(When operated) Max. 460×1.3=598V
Fan motors
EFM
CFM
LCD Sheet key
EC4 EC6
Operation board
EC3
EEV DMV
EMV
Modulation Valves
CM
Compressor