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9-8 VS1-MD AC Drive User Manual
Inverter
overheat
• Cooling system has
problems.
• Check for foreign
substances clogged in
the heat sink.
• Cooling fan has failed. • Replace the old
cooling fan with a new
one.
• Ambient temperature
is too high.
• Keep ambient
temperature under 50
degrees C.
Output Phase
loss
• Faulty contact in
output contactor.
• Replace or repair
output contactor.
• Faulty output wiring • Check output wiring.
Cooling Fan
Fault
• An foreign substance
is clogged in a
ventilating slot.
• Check the ventilating
slot and remove the
clogged substances.
• Cooling fan has failed. • Replace the cooling
fan.
Over voltage
• Decel time is too short
for the inertia of the
load.
• Increase the Decel
time.
• Regenerative load is
connected to the
drive.
• Use Dynamic Brake
Unit.
• Line voltage is too
high.
• Check to see if line
voltage exceeds the
rating.
Low voltage
• Line voltage is low. • Check to see if line
voltage is below the
rating.
• Load larger than line
capacity is connected
to line (ex: welding
machine, motor with
high starting current
connected to the
commercial line).
• Check the incoming
AC line. Adjust the
line capacity
corresponding to the
load.
• Faulty contactor on
the input of the
inverter.
• Change contactor.
Table 9.2 – Corrective Actions