Yaskawa VCD 723 - Manual (Page 36)

2 Installation and Start-up
30 Drive Start-up
9/15/93
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Power the drive down long enough for the charge light to go out.
●
Power up the drive.
Run the drive at low speed by using the JOG input if one is present. If
instability increases, the problem is noise related.
Return the carrier frequency to its original setting.
❺
If it has been determined that noise is the source of the problem, check
for grounding problems:
Motor must be grounded.
Drive must be grounded.
Check shield connections.
Power leads from the line and to the motor should be isolated from the
pulse generator signals.
External power supply connections for tachometer common should be
isolated from the earth ground.
External signals, if used, should be isolated from earth ground.
❻
If noise is not the problem (instability is not related to carrier
frequency), contact MagneTek Service about adjusting regulator
constants.
❏ Perform a motor test run. The test run should be in both the forward and
reverse direction.
❏ Connect the motor coupling, or belt, to the load.
❏ Verify once again that the VCD 723 parameter values are set to their proper
values. Refer to section 3 to find the operating procedure necessary to view
and change parameter values.
❏ Record any parameter values that were changed from their factory default
values.
❏ Operate the drive using external control signal inputs shown on the system
schematic and verify proper operation.
Parameter
Verification