40
Simple VAT20 Troubleshooting Procedure
VAT20 INV M alfunction
Clearly defined
m alfunction
Proceed exam ination
according to
m alfunction indication
Control board, driver
board, carry out
visual inspection
Sw itch pow er ON
Any illum inated
indicator on the control
panel
Check to see the
three m alfunction
record in Fn_30
Sign of burn
or breakage
Indication of
abnorm ality
Appearance
abnorm ality
M alfunction
indication
Any m alfunction
indication
Three m alfunction
record in Fn_30
The m alfunction
indication is?
Any sign of burnt
of breakage?
Is the prim ary
circuitry DM norm al?
Is the prim ary
circuitry I.G.B.T.
norm al?
Replace defective board
Is LED2 illum inate?
Is the
DC input voltage
of control pow er
supply norm al?
Is the control
pow er 5V
norm al?
Replace control board,
digital controller.
Is replacing
control board solve
the problem ?
Exam ining com ponent w ith
sign of burnt or breakage
Replace DM
Replace I.G.B.T.
Replace current surge
absorber
Exam ining term inals
and w irings
Replace driver board
Detail exam ination required.
Inverter m alfunction
NO
NO
NO
YES
YES
YES
NO
ABNORM AL
NORM AL
YES
NO
NO
NO
YES
NO
ABNORM AL
YES
NORM AL
ABNORM AL
NORM AL
NO
YES
(Continued on 41)
ABNORM AL
NORM AL