YASKAWA F7 User Manual page 130

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Digital
Operator Display
Drive's Cooling Fan Fault
FAN
A Drive's cooling fan fault was detected,
Cooling FAN Err
and the Drive overload protection was
<3021>
activated based on the internal electric
thermal value.
This fault is detected when L8-32 is set to 1.
PID Feedback Loss
This fault occurs when PID Feedback Loss
Detection is programmed to fault
FBL
(b5-12 = 2) and the PID Feedback < PID
Feedback Loss
Feedback Loss Detection Level (b5-13) for
the PID Feedback Loss Detection Time
(b5-14).
Output Ground Fault
GF
Drive output grounding current has
Ground Fault
exceeded 50% of the Drive rated output
current and L8-09 = 1 (enabled).
Output Open-phase
An open-phase occurred at the Drive output
LF
This fault is detected when output current
Output Phase Loss
has exceeded 5% imbalance and L8-07 = 1
(enabled).
Overcurrent
OC
Drive output current exceeded the
Over Current
overcurrent detection level (approximately
200% of Drive rated output current).
Heatsink Overheat
OH
The temperature of the Drive's heatsink
Heatsink Overtemp
exceeded the setting in L8-02 and
L8-03 = 0 to 2.
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Table 6.1 Fault Displays and Processing (continued)
Description
Diagnostics & Troubleshooting 6 - 5
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Cause
The Drive continued running
with an overload after the
cooling fan stopped.
PID feedback source
(e.g. transducer, sensor,
building automation signal) is
not installed correctly or is not
working.
Motor lead was shorted to
ground and/or a DCCT was
defective.
There was a broken wire in the
output cable.
There was a broken wire in the
motor winding.
The output terminals were
loose.
The motor being used has a
capacity less than 5% of the
Drive's maximum motor
capacity.
Low impedance motor was
used.
Shorted Drive output phase to
phase, shorted motor, locked
rotor, load too heavy, accel/
decel time too short, contactor
on the Drive output is opened
or closed, a special motor or a
motor with a FLA rating larger
than Drive rated output
current.
There was a heat source
nearby.
The ambient temperature was
too high.
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Corrective Action
Replace the cooling fan.
Verify Drive is programmed to
receive the PID feedback source
signal.
Check to ensure the PID feedback
source is installed and working
properly.
Remove the motor and run the
Drive without the motor.
Check the motor for a phase to
ground short.
Check the output current with a
clamp on meter to verify the
DCCT reading.
Check the wiring to the motor.
Check the motor for phase to
ground short.
Check the motor and Drive
capacity.
Add additional impedance.
Remove the motor and run the
Drive without the motor.
Check the motor for a phase-to-
phase short.
Check the Drive for a phase-to-
phase short at the output.
Verify C1-01 and C1-02 are set
correctly.
Check load conditions.
Check for dirt build-up on the
fans and heatsink.
Reduce the ambient temperature
around the Drive.