Washtech TCW-7055, Installation & Maintenance Manual

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9. Inverter Fault Display
If there is a fault associate with the inverter, then use the Table shown below
for corrective action.
Fault Display and Details
Indication Fault Display Description Corrective
Uu
1
Undervoltage (PUV)
Two seconds are counted after
detection of low voltage.
Uu
2
Under voltage (CUV)
Control circuit becomes low
voltage during the operation.
Uu
3
Under voltage
(MC-ANS fault)
Main circuit magnetic
contactor does not operate
correctly.
y
Checking wiring of line units
(at power supply)
y
Correct power supply voltage.
GF
Grounding Grounding current > approx.
50% of inverter rated current.
y
Check that monitor insulation
not deteriorated.
y
Check that there is no damage
to wring at load side.
O
C
Over current
Inv. Out current > 120% of
Inv. Rated current.
y
Check the motor winding
resistance and ground.
y
Increase ace time.
Ou
Over voltage
Detection level:
Approx. 400V for 220V class)
Approx. 800V for 440V class
[(
Cn-01
≧400V )]
Approx. 700V for 400V Class
[(
Cn-01
< 400V )]
Increase decal time and/or add
braking resistor.
FU
Fuse blown - Check short-circuit at load, ground
fault etc.
OH Radiation fin overheated
Fin temperature 90
0
C (194
0
F)
Check fan or ambient temperature
(less than 45
0
C, 113
0
F)
oL
1
Overload.
Protect the motor. Measure motor temperature-rise
and reduce load, then reset V/f.
oL
2
Overload. Protect the inverter. Reduce load, and increase ace time,
then reset V/f.
oL
3
Motor current
exceeds the preset
value because of
machine error or
overload.
When selecting inv. Output
OFF at “inv. Output current >
over-torque detection level”
and over-torque detection.
┌┌
Regenerative transistor
fault.
- Replace transistor.
┌
H
Braking resistor overhead Protect breaking resistor
incorporation in inverter unit.
Reduce regenerative load, or use
other resistor unit separately
installed.
FRn
Cooling fan fault. Cooling fan stop during
operation. Replace cooling fan.
-9
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