YASKAWA VS MINI J7 User Manual download pdf (Page 95)

 Troubleshooing

95

Trouble Cause Corrective Actions

The motor does

not operate when

an external

operation signal is

input.

The operation method selection is

wrong.

The run command (n02) is not set to

Control Circuit Terminal.

Set the run command (n02) to

Control Circuit Terminal.

A 3-wire sequence is in effect.

The multi-function input method

(n37) is set to 3-wire sequence, and

the S2 control terminal is not

closed.

To use a 3-wire sequence, make

the wiring so that the S2 control

terminal is closed. To use a

2-wire sequence, set the multi-

function input (n37) to a value

other than 3-wire sequence.

The motor stops.

The torque is not

output.

The stall prevention level during

acceleration is too low.

Because the stall prevention level

during acceleration (n56) is set too

low, the output current reaches the

set level, the output frequency is

stopped, and the acceleration time

is lengthened.

Check if the stall prevention level

during acceleration (n56) is set to

an appropriate value.

Local mode is in effect. Set the LO/RE selection of the

digital operator to RE.

The SW setting for the reference

selection is wrong.

Example: The reference 4-20mA is

input, but the SW is set to "V".

For analog input, make sure that

the frequency reference (n03)

and SW settings are correct.

The stall prevention level during

running is too low.

Because the stall prevention level

during running (n57) is set too low,

the output current reaches the set

level, and the speed drops.

Check if the stall prevention level

during running (n57) is set to an

appropriate value.

The load is too heavy.

If the load is too heavy, stall

prevention is activated, the output

frequency is stopped, and the

acceleration time is lengthened.

Lengthen the set acceleration

time (n16). Reduce the load.

The frequency reference is too

low.

The input frequency reference is

lower than the setting for the

min.output frequency (n14).

Input a frequency reference

greater than the min. output

frequency (n14).

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