Veichi AC310 Service Manual page 32

⚫ There are reference voltages on the control board: REF6V, REF3V. REF6V is converted
from 15V, REF6V provides voltage references for OC and CBC, i.e., REF-H, REF-L,
REF-H2, REF-L2, and REF3V is converted from REF6V (i.e., this voltage). REF3V is
converted from REF6V (i.e., if there is a problem with this output voltage, the OC fault
will be misreported or not reported, and no progressive current limiting will be
performed); REF3V is the reference power supply for the ADC module of the DSP.
3V3D Circuit components
Capacitors:
C41/C18/82/89/C95=2.2UF/0402
U17=AMS1117-3.3
REF6V Circuit components
Resistors: R45/R51/R30=1K/0805,
R20=10K/0402
R271=14.04K
Controllable precision voltage
regulator: U21=TL431AIDBZR
Capacitors: C69/C84=100NF/0402
C40=2.2UF/0402
AC310 Universal AC Drive Service Manual
10V Circuit components
Capacitors: C83/C88=100NF/0402
C87=2.2UF/0603
Resistors: R25/R205=20K/0402，
R164=2K/0402
R201=12K/0402, R165=10K/0402
Triode: Q1=2SC2873
Controllable precision voltage
regulator: U19=TL431AIDBZR
REF3V Circuit components
U12=TL084IDR
Resistor: R55/R53=1K/0402
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