Noise from motor at low speed

It is considered to be caused by inverter PWM control. It can be suppressed by raising the PWM carrier frequency (Pr.72), but the entire noise and leakage cu... More Details >>

Meaning of OL display (2)

Yes. "OL" is displayed under speed control whenever the torque limit is reached without regard to the rated torque. More Details >>

Multi-speed setting

Priorities are: Low speed (RL) > Middle speed (RM) > High speed (RH).For example, if the low speed (RL) and middle speed (RM) signals are input simulta... More Details >>

CC-Link

Slow blinking of the RUN LED indicates reverse operation.Fast blinking indicates that while the start command is input, the running frequency command is not ... More Details >>

When controlling motor with brake by inverter

Use the RUN signal to turn ON and OFF the brake.Using the MRS (output shutoff) signal to turn ON the brake shuts off the inverter's output and reduces influe... More Details >>

How can I have the motor coast to stop?

You can use the following two methods:1. Turn ON MRS at the same time when STF turns OFF.2. Set Pr.10 = 60 Hz, Pr.11 = 0 sec, and Pr.12 = 0% (when the invert... More Details >>

Speed change due to power supply voltage fluctuation

1. The output frequency satisfies the "control specification/frequency precision" even when the power supply voltage changes, but the output voltage cannot r... More Details >>

Trace function

The ST1 is a setting file and the TR1 is a waveform file. More Details >>

Detection of the motor load

An inverter is used to rotate a motor but it cannot be used to detect whether the belt is broken or not. However, the magnitude of the load will change when ... More Details >>

Dealing with Err.

The following causes are probable for persistent Err. display: 1. The terminals RES and SD are always short-circuited. 2. Operation panel contact or operatio... More Details >>