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Simple VAT20 Troubleshooting Procedure
V AT20 INV M alfunction
Clearly defined
m alfunction
YE S
S ign of burn
or breakage
YE S
Indication of
abnorm ality
P roceed exam ination
according to
m alfunction indication
Control board, driver
board, carry out
visual inspection
A ppearance
abnorm ality
NO
S witch power ON
A ny illuminated
indicator on the control
panel
YE S
A ny m alfunction
indication
M alfunction
indication
The m alfunction
indication is?
Three m alfunction
record in Fn_30
Check to see the
three m alfunction
record in Fn_30
(Continued)
NO
NO
A ny sign of burnt
of breakage?
NO
Is the prim ary
circuitry DM norm al?
NO RMA L
Is the prim ary
circuitry I.G.B .T.
norm al?
NO RMA L
YE S
Replace defective board
NO
NO
Is LED2 illum inate?
YE S
DC input voltage
of control power
supply norm al?
NO RMA L
Is the control
power source +5V
norm al?
Replace control board,
digital controller.
Is replacing
control board solve
the problem ?
32
YE S
NO
A BNO RMA L
A BNO RMA L
NO
Is the
A BNO RMA L
A BNO RMA L
NO RMA L
NO
YE S
E xam ining com ponent with
sign of burnt or breakage
Replace DM
Replace I.G.B.T.
Replace current surge
absorber
E xam ining terminals
and wirings
Replace driver board
Inverter m alfunction
Detail exam ination required.
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