144
TROUBLESHOOTING
8 - TROUBLESHOOTING & MAINTENANCE
8.6 Troubleshooting
Condition Check Point
The Motor Does Not Rotate
1) Main circuit inspection:
Is the input (line) voltage normal?
Is the motor connected correctly?
2) Input signal inspection:
Check the operating signal input to the VFD.
Check the forward and the reverse signal input simultaneously to the VFD.
Check the command frequency signal input to the VFD.
3) Parameter setting inspection:
Is the Run Prevention (AFN 19) function set?
Is the Run/Stop Source () set correctly?
Is the drive enable (EN) terminal input active?
Is the command frequency set to 0?
4) Load inspection:
Is the load too large or is the motor jammed?
Is a mechanical or supplemental brake engaged?
5) Other:
Is the alarm displayed on the keypad or is the Stop LED blinking?
The Motor Rotates in
Opposite Directions
Is the phase sequence of the output terminal T1/U, T2/V, T3/W correct?
Is the starting signal (forward/reverse) connected correctly?
The Difference
Between the
Rotating Speed and
the Reference is
Too Large
Is the frequency reference signal correct? (Check the level of the input signal)
Are the following parameter settings correct? Minimum Frequency - AFN 03, Maximum
Frequency - AFN 04, Analog Input Conguration - I/O 20-26. Is the input signal line
inuenced by external noise? (Use a shielded wire). Are there skip frequencies
programmed?
The VFD Does
Not Accelerate or
Decelerate Smoothly
Is the acceleration/deceleration time is set too short a period of time? Is the load too
large? Is the Torque Boost Conguration - AFN 07-11 set incorrectly?
The Motor Current is Too
High?
Is the load too large?
Is the Torque Boost Value (see above) too high?
The Rotating Speed Does Not
Increase
Is the Maximum Frequency (AFN 04) value correct? Is the load too large?
The Rotating Speed Oscillates
When the VFD is Operating.
1) Load inspection:
Is the load oscillating?
2) Input signal inspection:
Is the frequency reference signal oscillating?
3) Other:
Is the wiring too long when the inverter is using V/F control? (Over 500m).
Electronic Thermal Overload
1) Reduce load and/or running duty.
2) Increase VFD capacity.
3) Adjust TOL (AFN22) level to an appropriate level.
4) Select correct VFD capacity.
5) Select correct V/F pattern.
6) Install a cooling fan with a separate power supply.
External Fault
Eliminate fault at circuit connected to external fault terminal or cause of external fault
input.
IGBT Short
1) Check IGBT.
2) Check output wiring of VFD.
3) Increase acceleration or deceleration time.
Magnetic Contactor Fail Replace the magnetic contactor.
CPT Fuse opened Replace the CPT fuse.
To Next Page
Loading...
Need help?
General
