B&C Technologies SA Series Industrial - Manual (Page 73)

TROUBLE SHOOTING
7-13
7. “OH2” External alarm input
Problem External alarm was inputted (THR).
Possible Causes What to Check and Suggested Measures
1. An alarm function of the
external equipment was
activated.
Inspect external equipment operation.
→ Remove the cause of the alarm that occurred.
2. Connection ha been
performed incorrectly.
Check if the wire for the external alarm signal is correctly
connected to the terminal to which the “Alarm from external
equipment” has been assigned.
→ Connect the wire for the alarm signal correctly.
3. Incorrect settings.
Check if the “Alarm from external equipment” has been assigned
to an unassigned terminal.
→ Correct the assignment.
8. “OH4” PTC thermistor for motor protection
Problem Temperature of the motor rose abnormally.
Possible Causes What to Check and Suggested Measures
1. Temperature around the
motor exceeded that of
motor specifications.
Measure the temperature around the motor.
→ Decrease
the temperature.
→ Lighten the load.
2. Cooling system for the
motor malfunctioned.
Check if the cooling system is operating normally.
→ Repair or replace the cooling system.
3. Load was too heavy.
Measure the output current.
→ Lighten the load (e.g. lighten the load before overload occurs
using the overload early warning (E34) function).
→ Decrease the temperature around the motor.
→ Increase the carrier frequency (F26).
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.
5. A PTC thermistor and 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.