Yaskawa P7B Drive Bypass - Manual (Page 191)

Diagnostic & Troubleshooting 6 - 11
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, build-
ing 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.
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
Heatsnk Overtemp
(Flashing)
Cooling Fin/Cooling Fin Fan Overheat
The temperature of the Drive cooling fin
exceeded the temperature programmed in
parameter L8-02.
Cooling fan(s) are not working,
high ambient temperature, a
heating unit in close proximity
to Drive is present.
Check for dirt build-up on the
fans and cooling fins.
Reduce the ambient temperature
around the Drive.
Drive Internal Cooling Fan Remove the heating unit.
OH2
Over Heat 2
(Flashing)
Drive overheat pre-alarm signal is input
from a multi-function digital input terminal.
An external overheat condition
exists connected to one of the
multi-function input terminals
S3, S4, S5, S6 or S7. Check for an external condition.
Verify the program parameters
H1-01 thru H1-05.
OH3
Motor Overheat 1
(Flashing)
Motor Overheating Alarm
The Drive stops or continues operation
according to the setting of L1-03. Overheating of motor
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.
Table 6.2 Alarm Displays and Processing (Continued)
Digital
Operator Display
Description Cause Corrective Action