Yaskawa YASNAC PC NC Maintenance Manual - Manual (Page 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