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Troubleshooting
7-
21
A signal is being input to the frequency reference (current) terminal A1.
When 0 (added to terminal A1) is set for parameter H3-09 (Terminal A2 Function Selection) or H3-05 (Termi-
nal A3 Function Selection), a frequency corresponding to the terminal A2 or A3 input voltage (current) is
added to the frequency reference. Check to be sure that the set value and analog input value are suitable.
Slip Compensation Function has Low Speed Precision
If speed control accuracy is too low for the slip compensation function, the slip compensation limit has been
reached. With the slip compensation function, compensation cannot be carried out beyond the slip compensa-
tion limit set in parameter C3-03. Check to be sure that the set value is suitable.
Low Speed Control Accuracy at High-Speed Rotation in Open Loop Vec-
tor Control Method
The motor rated voltage is high.
The maximum output voltage for the MxC is determined by its input voltage. For example, if 200 VAC is
input, then the maximum output voltage will be 190 (200
×
0.95) VAC. The speed control accuracy will
decrease if the output voltage reference value exceeds the MxC maximum output voltage as a result of Open
Loop Vector Control. Use a motor with a low rated voltage (i.e., a special motor for use with Open Loop Vec-
tor), or change to Flux Vector Control.
Motor Deceleration is Too Slow
Use the following information when the motor deceleration is slow.
The deceleration time is too long.
Check the deceleration time setting (parameters C1-02, C1-04, C1-06, and C1-08).
Motor torque is insufficient.
If the parameters are correct and there is no overvoltage fault, then the motor’s power is limited. Consider
increasing the motor capacity.
The torque limit has been reached.
When a torque limit has been set in parameters L7-01 to L7-04, no torque will be output beyond that limit.
This can cause the deceleration time to be too long. Check to be sure that the value set for the torque limit is
suitable.
If H3-09 (Terminal A2 Function Selection) or H3-05 (Terminal A3 Function Selection) is set to 10, 11, 12 or
15 (positive and negative torque limit), check to be sure that the analog input value is suitable.