Yaskawa YASNAC PC NC Maintenance Manual Manuale Utente Scaricare il pdf (Pagina 151)

PC NC Maintenance Manual The VS-626M5

4-130

4. Operation

Input a run signal to start the drive unit operation. By inputting a run sig-

nal, the converter and inverter 7-segment LED displays are changed to “

.” Gradually increase the speed reference from 0%. The motor

begins to rotate.

Verify that the motor is turning in the proper direction. When forward run

is commanded (by FWD) and speed reference is positive, the motor shaft

turns counterclockwise (CCW) when viewed from the load machine. If the

rotation direction is reversed, or if the motor does not turn but only buzzes

or vibrates after the run signal is input, phases of the power cable or

encoder signal wire may be connected incorrectly. Turn OFF the power,

and ensure that the CHARGE LED and 7-segment LEDs are OFF. Then,

check the wiring.

When the motor turns in the proper direction, switch forward and reverse

run and verify that acceleration and deceleration are smooth in both for-

ward and reverse directions.

At the same time, check for excessive motor vibration or noise. Stationary

sounds at several kHz are due to the control method and do not indicate any

abnormality.

Figure 4.20: Motor Rotation Direction

Run Command

Run Signal FWD CCW CW

REV CW CCW

CCW

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Yaskawa YASNAC PC NC Maintenance Manual Manuale Utente Pagina 151