Daikin LX10F10A, Service Manual

Page: 101 / 126

4-12
4.7 Electrical Circuit and Servicing Precautions
DC400-710V
Quasi
AC280-500V
Inverter box
Control box
C/B
Compressor
AC24V
3 phase AC
380-415V/50Hz
440-460V/60Hz
Inverter board
EC8
ACL
Noise filter
board EC9
MC
Fan motors
SV
Sensors
Modulation Valves
Solenoid Valves
Input to
CPU board
Output from
CPU board
AC ⇒ DC ⇒ Quasi-AC
Sheet key
EC6
I/O board
EC2
Operation board
EC3
CPU board
EC1
Tr
PT/CT
EC7
LCD
EC4
CFM
EFM
DMV EEV
MEV
CM
Power circuit 380-415V/50Hz 440-460V/60Hz
Operation circuit AC24V
INV. Circuit DC400-710V ⇒ Quasi AC280-500V
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.
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 P2 and N on the inverter board is lowered
to DC50V or below before starting inspection.
(When stopped) Max. 460V*1.1* √ 2=713V
(When operated) Max. 460V*1.3=598V
Terminal P2
Terminal N
Tester