Yaskawa VCD 723 - Manual (Page 35)

2 Installation and Start-up
29 Drive Start-up
9/15/93
●
Manually rotate the shaft clockwise, as viewed from the shaft end. Verify
that the displayed PG feedback is negative (“-”).
❏ Check the motor rotation.
●
Check that the drive is in the forward rotation mode.
●
Start the motor at a slow speed by using the JOG input if one is present.
Check that the motor accelerates smoothly and that the speed feedback is
the same as the speed reference.
●
If the motor does not accelerate smoothly or oscillates, check or perform
the following:
❶
Reverse any two motor leads.
IMPORTANT
If leads are reversed, re-identify and record the fact that the leads
were reversed.
❷
If the speed feedback does not read the same as the speed reference,
verify that the pulse generator’s Pulse Per Revolution constant
(function number 46) is set to the proper value for your pulse
generator.
❸
Again start the motor at a slow speed by using the JOG input if one is
present. If instability is still present, check for a noise related
problem:
Program the drive for open loop mode by disabling the Pulse
Generator input.
Start the motor at low speed again by using the JOG input if one is
present. If instability disappears, the problem is noise related.
Program the drive for closed loop mode by enabling the Pulse
Generator input.
❹
To verify that noise is the source of the problem, perform the
following:
Change the drive constant, which changes the carrier frequency, from
2.08 KHz to 12.5 KHz.
●
Using the LCDU change the appropriate constants.
● Using the LCDU save the changes to NVRAM.