YASKAWA P7 User Manual page 148

Digital
Operator Display
EF0
Communication Option Card External Fault
Opt External Flt
EF3
External Fault at Terminal S3
Ext Fault S3
EF4
External Fault at Terminal S4
Ext Fault S4
EF5
External Fault at Terminal S5
Ext Fault S5
EF6
External Fault at Terminal S6
Ext Fault S6
EF7
External Fault at Terminal S7
Ext Fault S7
PI Feedback Loss
This fault occurs when PI Feedback Loss
Detection is programmed to fault
FBL
(b5-12 = 2) and the
Feedback Loss
PI Feedback < PI Feedback Loss Detection
Level (b5-13) for the PI 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
Output Open-phase
LF
An open-phase occurred at the Drive output
Output Phase Loss
This fault is detected when output current
has exceeded 5% imbalance.
Overcurrent
OC
Drive output current exceeded the
Over Current
overcurrent detection level (approximately
180% of Drive rated output current)
Table 6.1 Fault Displays and Processing
Description
Diagnostic & Troubleshooting 6 - 4
Cause
An external fault condition
exists
An external fault condition
exists connected to a multi-
function digital input
PI Feedback source
(e.g. transducer, sensor,
building automation signal) is
not installed correctly or is not
working
Motor lead is shorted to
ground, DCCT 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. Add additional impedance.
Parameter E2-o3 set incorrectly
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
Corrective Action
Check for an external condition
Verify the parameters
Verify communication signal
Eliminate the cause of an
external fault condition
Remove the fault from a multi-
function digital input
Verify Drive is programmed to
receive the PI Feedback source
signal
Check to ensure the PI 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.
Adjust E2-o3 to a lower value.
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