Instruction Manual

134
Protective
Operation
Output is shut
OFF and motor
coasts to a
stop.
UV2 (Control power supply
fault)
Voltage fault of control power
supply is detected.
Cycle power.
If the fault remains,
replace the inverter.
(Main Circuit Voltage Fault)*
The main circuit DC voltage
oscillates unusually (not when
regenerating).
• An open-phase
occurred in the input
power supply.
• A momentary power
loss occurred.
• The voltage
fluctuations in the
input power supply
are too large.
• The line voltage
balance is bad.
⇓
Check the following:
• Main circuit power
supply wiring is
connected.
• Power supply
voltage.
• Terminal screws are
securely tightned.
(Output Open-Phase)*
An open-phase occurred at
the Inverter output.
• There is a broken
wire in the output
cable.
• There is a broken
wire in the motor
winding.
• The output terminals
are loose.
⇓
• Output wiring is
connected.
• Motor impendance.
• Output terminal
screws are securely
tightened.
OH (Cooling fin overheat)
Temperature rise because of
inverter overload operation or
intake air temperature rise.
• Excessive load
• Improper V/f pattern
setting
• Insufficient axel time
if the fault occurs
during acceleration
• Intake air
temperature
exceeding 122
°
F
(50
°
C)
• Cooling fan stops
⇓
Check the following:
• Load size
• V/f pattern setting
(parameters n011 to
n017)
• Intake air
temperature
Alarm Display
Inverter
Status
Explanation
Causes and
Corrective Actions
Digital
Operator
RUN (Green)
ALARM (Red)
* Display only applies to 200/400V class,7.5/10Hp, 5.5/7.5 kW inverters.