YASKAWA VS-626M5 Instruction Manual page 190

Troubleshooting
12
Table 12.2 Inverter Faults (continued)
Fault No. Name
Main circuit DC bus voltage became
Main circuit
lower than undervoltage detection
undervoltage
level during run.
Control cir- Control circuit power supply became
cuit under- lower than undervoltage detection
voltage level.
Winding
Winding selection was not completed
selection
within set time.
fault
Inverter did not stop within 10 se-
Emergency
conds after emergency stop com-
stop fault
mand.
Encoder sig-
Motor encoder signal was discon-
nal cable dis-
nected or connected improperly.
connection
Motor over- Motor speed exceeded 120% of set
speed rated speed.
Excessive
Speed falls to less than 50% of refer-
speed devi-
ence value.
ation
Inverter output (U/T1, V/T2, W/T3)
Load fault
was disconnected.
Motor Lock The motor is locked. (The motor
Detection speed remains at 35 min
(For IP mo- for 10 seconds during the torque
tors only) reference saturation.)
Motor over- Motor temperature exceeded upper
heat 1 limit (minor fault).
Motor over- Motor temperature over upper limit
heat 2 continued for over one minute.
Contents Corrective Actions
Check the input supply voltage.
Check the control supply voltage.
S Check the control constant
C1-25.
S Check magnetic contactor wir-
ing for winding selection.
S Check control constant C1-25.
S Check the setting of control
constant C1-24 and whether ex-
ternal torque limit signals TLL
and TLH are input.
Check the wiring of encoder sig-
nal lines.
S Confirm that encoder signal
lines are separated from main
circuit or other power lines.
S Check the control constants.
S Check if the load is heavy or a
tool is jammed.
S Check whether external torque
limit signals TLL and TLH are
input.
S Check the control constants.
S Check the wiring of encoder sig-
nal lines.
Check Inverter output wiring.
S Check if the load is heavy or a
tool is jammed.
S Check the wiring between In-
verter and motor.
S Check the wiring of encoder sig-
−1
or lower
nal lines.
S Make sure that the motor shaft
rotates.
S Check if a motor fault or a con-
tact between rotor and stator oc-
curs, or if a bearing is damaged.
S Check the wiring.
S Confirm that motor cooling air is
normal with power ON.
S Confirm that the fan is not C fi
clogged with dust or oil.
S Check the wiring of motor
thermistor signal lines.
12 - 6
Error Code
FFFf
FFFf
FFfF
FFfF
FFff
FFff
FFff
FFff
FFff
FfFF
th t th f i t
FfFF