YASKAWA V7 Technical Manual page 115

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