Yaskawa F7 Drive User Manual - Manual (Page 137)

Diagnostics & Troubleshooting 6 - 12
Table 6.2 Alarm Displays and Processing (continued)
Digital
Operator Display
Description Cause Corrective Action
FBL
Feedback Loss
PID Feedback Loss
This alarm occurs when PID Feedback Loss
Detection is programmed to alarm
(b5-12 = 1) 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, build-
ing automation signal) was not
installed correctly or was 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.
OH
Heatsnk Overtemp
(Flashing)
Cooling Fin/Cooling Fin Fan Overheat
The temperature of the Drive’s heatsink
exceeded the temperature programmed in
parameter L8-02.
Enabled when L8-03=3. Cooling fan(s) were not
working, high ambient
temperature, a heat source in
close proximity to Drive
present, or dirty heatsink.
Check for dirt build-up on the
fans and cooling fins.
Reduce the ambient temperature
around the Drive.
Remove the heating unit.
OH2
Over Heat 2
(Flashing)
Drive overheat alarm signal is input from a
multi-function digital input terminal S3-S8
(H1-01 to H1-06) that is programmed for B:
overheat alarm. An external overheat condition
exists that was connected to one
of the multi-function input
terminals S3 - S8. Check for an external condition.
Verify the program parameters
H1-01 thru H1-06.
OH3
Motor Overheat 1
(Flashing)
Motor Overheating Alarm
Detected when A2 or A3, programmed for
motor temperature (H3-09 or H3-05 = E),
exceeds 1.17V for time L1-05 and
L1-03 = 3.
Overheating of the motor as
measured by the motor
thermistor.
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).
OL3
Overtorque Det 1
(Flashing)
Overtorque Detection 1
Drive output current > L6-02 for more than
the time set in L6-03 and L6-01 = 1 or 2.
Motor was overloaded.
Ensure the values in L6-02 and
L6-03 are appropriate.
Check application/machine
status to eliminate fault.
OL4
Overtorque Det 2
(Flashing)
Overtorque Detection 2
Drive output current > L6-05 for more than
the time set in L6-06 and L6-04 = 1 or 2.
Motor was overloaded.
Ensure the values in L6-05 and
L6-06 are appropriate.
Check application/machine
status to eliminate fault.
OS
Overspeed Det
(Flashing)
Overspeed
The motor speed feedback (U1-05)
exceeded the value set in F1-08 for a time
longer than the setting in F1-09.
Detected when A1-02 = 1 or 3 and F1-03 = 3.
Overshooting/Undershooting
was occurring. Adjust the ASR settings in the C5
parameter group.
The reference was too high.
Check the reference circuit and
reference gain.
The settings in F1-08 and F1-09
were not appropriate. Check the settings in F1-08 and
F1-09.