YASKAWA F7 User Manual page 132

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Digital
Operator Display
Drive Overload
OL2
The Drive output current exceeded the
Inv Overload
Drive's overload curve.
Overtorque Detection 1
OL3
Drive output current > L6-02 for more than
Overtorque Det 1
the time set in L6-03 and L6-01 = 3 or 4.
Overtorque Detection 2
OL4
Drive output current > L6-05 for more than
Overtorque Det 2
the time set in L6-06 and L6-04 = 3 or 4.
High Slip Braking OL
OL7
The output frequency stayed constant for
longer than the time set in n3-04 during
HSB OL
high slip braking.
Digital Operator Connection Fault
Detected when the Digital Operator is
OPR
removed and the Drive is commanded to
Oper Disconnect
run through the Digital Operator
(b1-02 = 0).
Motor Overspeed
Detected when F1-03 = 0 to 2 and
OS
A1-02 = 1 or 3.
Overspeed Det
The motor speed feedback (U1-05)
exceeded the setting in F1-08 for a longer
time than the setting in F1-09.
DC Bus Overvoltage
The DC bus voltage has exceeded the trip
OV
point.
DC Bus Overvolt
208-240Vac: Trip point is 410Vdc
480Vac: Trip point is 820Vdc
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Table 6.1 Fault Displays and Processing (continued)
Description
Diagnostics & Troubleshooting 6 - 7
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Cause
The load was too large, or the
accel/decel times are too short.
The voltage of the V/F pattern
was incorrect for the
application.
The size of the Drive was too
small.
Motor was overloaded.
Motor was overloaded.
The inertia of the load is too
large.
The Digital Operator was not
attached, or the Digital
Operator connector was
broken.
Overshooting/Undershooting
was occurring.
The reference was too high.
The settings in F1-08 and
F1-09 are not appropriate.
High input voltage at R/L1,
S/L2 and T/L3.
The deceleration time is set
too short.
Power factor correction
capacitors are being used on
the input or output to the
Drive.
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Corrective Action
Recheck the cycle time and the
size of the load as well as the times
set in C1-01 and C1-02.
Review the V/F pattern
parameters, E1-01 thru E1-13.
Change to a larger size Drive.
Ensure the values in L6-02 and L6-
03 are appropriate.
Check application/machine status
to eliminate fault.
Ensure the values in L6-05 and L6-
06 are appropriate.
Check application/machine status
to eliminate fault.
Make sure the load is an inertial.
If possible, reduce the load
inertia.
Attach the Digital Operator.
Check the Digital Operator
connector.
Verify the setting of o2-06.
Adjust the ASR settings in the C5
parameter group.
Check the reference circuit and
reference gain.
Check the settings in F1-08 and
F1-09.
Check the input circuit and reduce
the input power to within
specifications.
Extend the time in C1-02 or other
active decel settings used such as
C1-04, C1-06, C1-08, or C1-09
(time).
Remove the power factor
correction capacitors.