TROUBLE SHOOTING
7-14
Possible Causes What to Check and Suggested Measures
4. The set activation
level (H27) of the PTC
thermistor for motor
overheat protection
was inadequate.
Check the thermistor specifications and recalculate the detection
voltage.
→ Reconsider the data of function code H27.
pull-up resistor were
connected incorrectly
or their resistance was
inadequate.
Check the connections and resistance.
→ Correct the connections and resistance.
6. The value set for the
torque boost (F09) was
too high.
Check the data of function code F09 and readjust the data so that the
motor does not stall even if you set the data to a lower value.
→ Change the data of the function code.
7. The V/f pattern did not
match the motor.
Check if the base frequency (F04) and rated voltage (at base
frequency) (F05) match the values on the nameplate on the motor.
→ Match the function code data to the values on the nameplate of
the motor.
9. “dbH” Overheat protection for barking resistor
Problem Thermal protection for braking resistor activated.
Possible Causes What to Check and Suggested Measures
1. Braking load was too
heavy.
Recalculate the relation between the braking load and braking
capacity.
→ Lighten the braking load.
→ Reconsider the braking resistor in order to improve braking
ability. Resetting the data of function codes F50 and F51 is also
required.
2. The deceleration time
was too short.
Recalculate the required deceleration torque and time from the
moment of inertia for the load and the deceleration time.
→ Increase the deceleration time (F08, E11, and H54).
→ Reconsider the braking resistor in order to improve the braking
ability. Resetting the data of function codes F50 and F51 is also
required.
3. Incorrect values have
been set for the data of
function codes F50
and F51.
Check the braking resistor specifications.
→ Reconsider and change the data of function codes F50 and F51.
NOTE: The inverter does not detect the overheating alarm of a braking resistor by
monitoring its surface temperature, but by monitoring its load magnitude.
Therefore, even if the surface temperature itself does not rise, the alarm may be
detected if the resistor is used more frequently than the set data of function codes
F50 and F51. If you use the resistor to the limit of its capacity, you must adjust
the data of function codes F50 and F51 while checking the surface temperature of
the resistor.
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