Yaskawa DSD 406 - Manual (Page 67)

Fault/Error Possible Causes &
Code
Fault/Error Name
Corrective Actions
Table 3. Troubleshooting Guide – Continued
DCU Reserved Interrupt
DCU Uninitialized Interrupt
DCU Trace Exception
DCU User Exception
DCU Spurious Exception
Web Break
Overspeed Trip
Main PCB Hardware
➊
Unplug and reseat all cables and socketed
devices.
❷
Replace main drive PCB. See “Replacing
Drive Control PCB”/Maintenance Section.
❸
Electromagnetic noise near the drive’s
main PCB may be the cause. Record
the situations during which this fault
occurred. Eliminate noise.
This fault is declared by the WEBB_0 PAC
block. This is a backup level web break
detection fault and is not capable of
detecting all valid web breaks.
➊
If an actual web break has not occurred,
then the parameter for this fault may have
to be adjusted. Functions 150, 151, and
152 are usually used to setup this fault.
This fault is declared by the TMON_0 PAC
block.
➊
Function 41, “Overspeed Trip”, should
normally be set to 110%. If this DC
drive is used above base speed, then this
overspeed trip point should be increased
to allow for higher speeds.
❷
A tach loss could also cause this fault.
Check that the tach signal is reaching the
drive, that tach wiring is correct, and that
the tach is not damaged, loose, or cracked.
❸
Noise on the tach wires or airborne noise
near the Main PCB can cause this fault.
Check that tach wiring does not run
parallel to power wiring. Tach wires
should be run with signal level wires only.
❹
A speed command that exceeds the tach
overspeed setting can cause this fault.
Reduce speed reference or increase
overspeed setpoint. A trim to the speed
reference could cause an overspeed.
Check that speed trims are limited
properly.
➎
An improperly tuned speed regulator can
cause an overspeed. Check tuning.
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