16
5. OPERATION PRINCIPLES BY PARTS OF CIRCUIT
5-1) POWER
5-2) OSCILLATION CIRCUIT
Terminal
Oscillation Frequency
●
Vcc(DC 5V)
<< BLDC
+12V(DC 12V)
MICOM POWER AND SENSORS
BLDC MOTOR POWER(NOT USE)
RELAY,PANEL POWER
●
When turned on, rectified AC voltage which is stepped down on 2nd transformer flows between
①
and
③
at about AC 15V, goes through the diode D101 and D104 is changed to DC, and provide constant 12V.
It provides 5V to MICOM and other circuits via regulator REG102 (MC7805ACT), and make entire PCB
operate.
●
It is an Oscillation Circuit for synchronism clock generation and time calculation on the information sending &
receiving of the MICOM internal logic elements and when specifications for Resonator change, the timing
system of MICOM changes resulting in errors. (Rated parts must be used)
Terminal
Oscillation Frequency
Xin(#19)
Xout(#18)
8.0MHz
8.0MHz
