LSIS Co., Ltd. |
07
Question: The motor does not rotate and the output current is too high at start.
•
Cause: the load is too high. It can be solved by using manual/auto torque boost and changing some parameters.
Question: The motor makes humming sound or loud noises.
•
Answer: Slightly increase or decrease the carrier frequency in Cn04.
Question: When the drive is running, the Earth-Leakage Circuit Breaker(ELCB) is activated.
•
Cause: The ELCB will disconnect the power if leakage current flows to grounding during drive operation.
•
Answer1: Connect the drive to grounding terminal.
•
Answer2: Check if the ground resistance is less than 100Ω for 200V class.
•
Answer3: check the capacity of ELCB and connect it to the drive according to the rated current of the drive.
•
Answer4: reduce the carrier frequency in Cn-04.
•
Answer5: Attempt to keep the cable distance from the drive to motor short as possible.
Question: How do I reset the drive back to factory default settings?
•
Answer: Set CF-93 to 1 (All groups) and press the [ENT] key. CF-93 is displayed again when the initialization has been completed.
Question: How do I adjust the time it takes the motor to speed up or down?
•
Answer: Adjust the acceleration time in ACC and deceleration time in dEC.
Question: How do I prevent the drive from tripping on an OV fault (overvoltage) while the motor is ramping down?
•
Answer1: Increase the deceleration time in dEC.
•
Answer2: Activate flux braking in Pr-50. Activate the very first bit on the left.
•
Answer3: DB resistor may be installed due to the characteristics of the load.
Question: How do I prevent the drive from tripping on an OLT(overload) while the motor is ramping up or down?
•
Answer: Verify motor rated current in bA-13 and motor overload parameter setting in Pr-20(Overload trip selection),
Pr-21(Overload trip level), and Pr-22(Overload trip time).
Question: How do I run the motor above the nominal motor speed?
•
Answer: Increase the maximum frequency in dr-20. At V/f mode, maximum frequency is 400Hz and 120Hz for
sensorless mode.
Question: Does the drive create harmonics? If so, are they a problem?
•
Answer: All standard drives create 5
th
and 7
th
harmonic frequencies. Occasionally, depending on the applications, there
may be issues and harmonics can cause problems such as transformer heating or interference with other communication
devices installed near the drive. To reduce interference, the installation of noise filters or line filters may be required.
Additionally, it may be helpful to adjust the carrier frequency to the minimum value in Cn-04.
1 Manual Torque Boost
Slightly increase the forward or reverse boost in dr-16 or dr-17
If the torque boost level is too high, a trip may occur such as IOL.
2 Auto Torque Boost(ATB)
Set dr-15 to 1. It is necessary to reduce the manual boost value (ex. 0~2%) in dr-16 or dr-17,
and then to adjust the values in dr-26~28.
3 Starting Frequency Slightly increase the start frequency in dr-19. (ex. 0.5
→
1.0
→
1.5
→
2.0Hz)
4 User V/F Pattern
When bA-07 is set to 2(User V/f), User V/f pattern can be set up according to the applications and motor
characteristics.
Frequently Asked Questions (FAQ)
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