Minor Fault Detection; Minor Fault Displays And Processing - YASKAWA VARISPEED-616G5 Instruction Manual

Troubleshooting

9.1.2 Minor Fault Detection

9.1.2 Minor Fault Detection
Minor fault display
EF (blinking)
External Fault
UV (blinking)
DC Bus Undervolt
OV (blinking)
Overvoltage
OH (blinking)
Heatsink Over tmp O
OH2 (blinking)
Over Heat 2
OL3 (blinking)
Overtorque Det 1
9
OL4 (blinking)
Overtorque Det 2
OS (blinking)
Over speed Over speed
PGO (blinking) PGO (blinking)
PG open PG open
Minor faults are a type of Inverter protection function that do not operate the fault contact output and are auto-
matically returned to their original status once the cause of the minor fault has been removed.
The Digital Operator display blinks and the minor fault is output from the multi-function outputs (H2-01 to
H2-03).
Take appropriate countermeasures according to the table below.
Table
9.2

Minor Fault Displays and Processing

Meaning
Forward/Reverse Run Commands
Input Together
Both the forward and reverse run
commands have been ON for more
than 0.5 s.
Main Circuit Undervoltage
The following conditions occurred
when there was no Run signal.
S The main circuit DC voltage was
below the undervoltage detection
level (L2-05).
S The surge current limiting contac-
tor opened.
S The control power supply voltage
when below the CUV level.
Main Circuit Overvoltage
The main circuit DC voltage exceed-
ed the overvoltage detection level.
200 V class: Approx. 406 V
400 V class: Approx. 812 V
Cooling Fin Overheating
The temperature of the Inverter's
cooling fins exceeded the setting in cooling fins exceeded the setting in
L8-02.
Inverter Overheating Pre-alarm
An OH2 alarm signal (Inverter over-
heating alarm signal) was input from
a multi-function input.
Overtorque 1
There has been a current greater than
the setting in L6-02 for longer than
the setting in L6-03.
Overtorque 2
There has been a current greater than
the setting in L6-05 for longer than
the setting in L6-06.
Overspeed
The speed has been greater than the The speed has been greater than the
setting in F1-08 for longer than the
setting in F1-09.
The PG is disconnected.
The Inverter is outputting a frequen-
cy, but PG pulses aren't being input. cy, but PG pulses aren't being input.
Probable causes
−−−
See causes for UV1, UV2, and
UV3 faults.
The power supply voltage is too high.
The ambient temperature is too high.
There is a heat source nearby.
The Inverter cooling fan has stopped.
−−−
−−−
−−−
Overshooting/undershooting are oc-
curring.
The reference speed is too high.
The settings in F1-08 and F1-09
aren't appropriate.
There is a break in the PG wiring.
The PG is wired incorrectly.
Power isn't being supplied to the PG.
9 - 6
Corrective Actions
Check the sequence of the forward
and reverse run commands.
:Since the rotational direction is un-
known, the motor will be deceler-
ated to a stop when this minor
fault occurs.
See corrective actions for UV1,
UV2, and UV3 faults.
Decrease the voltage so it's within
specifications.
Install a cooling unit.
Remove the heat source.
Replace the cooling fan. (Contact
your Yaskawa representative.)
Clear the multi-function input's over-
heating alarm input.
S Make sure that the settings in L6-02
and L6-03 are appropriate.
S Check the mechanical system and
correct the cause of the overtorque.
S Make sure that the current setting in
L6-05 and time setting in L6-06 are
appropriate.
S Check the mechanical system and
correct the cause of the overtorque.
Adjust the gain again.
Check the reference circuit and refer-
ence gain.
Check the settings in F1-08 and
F1-09.
Fix the broken/disconnected wiring.
Fix the wiring.
Supply power to the PG properly.