YASKAWA E7LVD002 Technical Manual page 186

Digital
Operator Display
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)
LL3
Loss of Load Detection 1
Loss of Load Det 1
Drive output current < L6-02 for more than
(Flashing)
the time set in L6-03
Cooling Fin/Cooling Fin Fan Overheat
OH The temperature of the Drive cooling fin
exceeded the temperature programmed in
Heatsnk Overtemp
(Flashing) parameter L8-02.
Drive Internal Cooling Fan
OH2
Drive overheat pre-alarm signal is input
Over Heat 2
from a multi-function digital input terminal.
(Flashing)
OH3
Motor Overheating Alarm
Motor Overheat 1
The Drive stops or continues operation
(Flashing)
according to the setting of L1-03.
Table 6.4 Alarm Displays and Processing (Continued)
Description
Diagnostic & Troubleshooting 6 - 14
Cause
PI Feedback source
(e.g. transducer, sensor, build-
ing automation signal) is not
installed correctly or is not
working.
Motor is underloaded.
Cooling fan(s) are not working,
high ambient temperature, a
heating unit in close proximity
to Drive is present.
An external overheat condition
exists connected to one of the
multi-function input terminals
S3, S4, S5, S6 or S7.
Overheating of motor
Corrective Action
Verify Drive is programmed to
receive the PI Feedback source
signal.
Check to ensure the PI Feedback
source is installed and working
properly.
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.
Ensure the values in
L6-02 and L6-03 are appropriate.
Check application/machine status
to eliminate fault.
Check for dirt build-up on the
fans and cooling fins.
Reduce the ambient temperature
around the Drive.
Remove the heating unit.
Check for an external condition.
Verify the program parameters
H1-01 thru H1-05.
Recheck the cycle time and the
size of the load.
Recheck the accel/decel time
(C1-01 and C1-02).
Recheck the V/F pattern (E1-01
thru E1-13).
Recheck the motor rated current
value (E2-01).
Check the digital operator
connector.
Verify the setting of
o2-06.