YASKAWA P7, User Manual, Page: 148 / 256

Diagnostic & Troubleshooting 6 - 4
EF0
Opt External Flt
Communication Option Card External Fault
An external fault condition
exists
Check for an external condition
Verify the parameters
Verify communication signal
EF3
Ext Fault S3
External Fault at Terminal S3
An external fault condition
exists connected to a multi-
function digital input
Eliminate the cause of an
external fault condition
EF4
Ext Fault S4
External Fault at Terminal S4
EF5
Ext Fault S5
External Fault at Terminal S5
EF6
Ext Fault S6
External Fault at Terminal S6
EF7
Ext Fault S7
External Fault at Terminal S7
Remove the fault from a multi-
function digital input
FBL
Feedback Loss
PI Feedback Loss
This fault occurs when PI Feedback Loss
Detection is programmed to fault
(b5-12 = 2) and the
PI Feedback < PI Feedback Loss Detection
Level (b5-13) for the PI Feedback Loss
Detection Time (b5-14)
PI Feedback source
(e.g. transducer, sensor,
building automation signal) is
not installed correctly or is not
working
Verify Drive is programmed to
receive the PI Feedback source
signal
Check to ensure the PI 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
Motor lead is shorted to
ground, DCCT 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.
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.
Parameter E2-o3 set incorrectly Adjust E2-o3 to a lower value.
OC
Over Current
Overcurrent
Drive output current exceeded the
overcurrent detection level (approximately
180% 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
and 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
Table 6.1 Fault Displays and Processing
Digital
Operator Display
Description Cause Corrective Action