6-5
Fault Display
Digital RUN (Green)
Drive
Explanation
Causes and
Operator ALARM (Red)
Status Corrective Actions
UV2 (Control power Cycle power.
supply fault) If the fault remains.
Voltage fault of control replace the drive.
power supply is detected.
OH (Cooling fin overheat) • Excessive load
Temperature rise • Improper V/f pattern
because of drive setting
overload operation or • Insufficient accel time
intake air temperature if the fault occurs
rise. during acceleration
• Intake air temperature
exceeding 122°F (50°C)
Check the following:
• Load size
• V/f pattern setting
(parameters n011 to n017)
• Intake air temperature.
OL1 (Motor overload) • Check the load size or
Protective Motor overload V/f pattern setting
Operation. protection operates by (parameters n011 to n017)
Output is built-in electronic thermal • Set the motor rated
shut OFF overload relay. current shown on the
and motor nameplate in parameter
coasts to n036.
a stop.
OL2 (Drive overload) • Check the load size or
Drive overload V/f pattern setting
protection operates by (parameters n011 to n017)
built-in electronic thermal • Check the drive
overload relay. capacity.
OL3 (Overtorque detection) Check the driven
V/f mode: Drive output machine and correct the
current exceeded the cause of the fault, or
preset value in parameter increase the value of
n098. parameter n098 up to the
Open Loop Vector mode: highest value allowed for
Motor current or torque the machine.
exceeded the preset
value in parameters
n097 and n098.
When overtorque is
detected, drive performs
operation according to the
preset setting of parameter
n096.
Table 6-2. Fault Displays and Corrective Actions
- Continued
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