Yaskawa F7 Drive User Manual - Manual (Page 130)

Diagnostics & Troubleshooting 6 - 5
Table 6.1 Fault Displays and Processing (continued)
Digital
Operator Display
Description Cause Corrective Action
FAN
Cooling FAN Err
<3021>
Drive’s Cooling Fan Fault
A Drive’s cooling fan fault was detected,
and the Drive overload protection was
activated based on the internal electric
thermal value.
This fault is detected when L8-32 is set to 1.
The Drive continued running
with an overload after the
cooling fan stopped.
Replace the cooling fan.
FBL
Feedback Loss
PID Feedback Loss
This fault occurs when PID Feedback Loss
Detection is programmed to fault
(b5-12 = 2) and the PID Feedback < PID
Feedback Loss Detection Level (b5-13) for
the PID Feedback Loss Detection Time
(b5-14).
PID feedback source
(e.g. transducer, sensor,
building automation signal) is
not installed correctly or is not
working.
Verify Drive is programmed to
receive the PID feedback source
signal.
Check to ensure the PID feedback
source is installed and working
properly.
GF
Ground Fault
Output Ground Fault
Drive output grounding current has
exceeded 50% of the Drive rated output
current and L8-09 = 1 (enabled).
Motor lead was shorted to
ground and/or a DCCT was
defective.
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.
LF
Output Phase Loss
Output Open-phase
An open-phase occurred at the Drive output
This fault is detected when output current
has exceeded 5% imbalance and L8-07 = 1
(enabled).
There was a broken wire in the
output cable.
There was a broken wire in the
motor winding.
The output terminals were
loose.
Check the wiring to the motor.
Check the motor for phase to
ground short.
The motor being used has a
capacity less than 5% of the
Drive’s maximum motor
capacity.
Check the motor and Drive
capacity.
Low impedance motor was
used.
Add additional impedance.
OC
Over Current
Overcurrent
Drive output current exceeded the
overcurrent detection level (approximately
200% of Drive rated output current).
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.
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.
OH
Heatsink Overtemp
Heatsink Overheat
The temperature of the Drive’s heatsink
exceeded the setting in L8-02 and
L8-03 = 0 to 2.
There was a heat source
nearby. Check for dirt build-up on the
fans and heatsink.
The ambient temperature was
too high. Reduce the ambient temperature
around the Drive.