7
-16
Alarm Detection
Alarms are detected as a type of Inverter protection function that do not operate the fault contact output. The
system will automatically returned to its original status once the cause of the alarm has been removed.
The Digital Operator display blinks and an alarm is sent from the multi-function outputs (H2-01 to H2-05) if
selected.
When an alarm occurs, take appropriate countermeasures according to the table below.
Table 7.3 Alarm Displays and Processing
Display
Meaning
Probable causes
Corrective Actions
EF
(blinking)
External
Fault
Forward/Reverse Run Commands
Input Together
Both the forward and Reverse Run
Commands have been ON for more
than 0.5 s.
–
Check the sequence of the forward
and Reverse Run Commands.
Since the rotational direction is
unknown, the motor will be deceler-
ated to a stop when this minor fault
occurs.
UV
(blinking)
DC Bus
Undervolt
Main Circuit Undervoltage
The following conditions occurred
when there was no Run signal.
• The main circuit DC voltage was
below the Undervoltage Detection
Level Setting (L2-05).
• The surge current limiting mag-
netic contactor opened.
• The control power supply voltage
when below the CUV level.
See causes for UV1, UV2, and UV3
faults in the previous table.
See corrective actions for UV1,
UV2, and UV3 faults in the previ-
ous table.
OV
(blinking)
DC Bus
Overvolt
Main Circuit Overvoltage
The main circuit DC voltage exceeded
the overvoltage detection level.
200 V Class: Approx. 410 V
400 V Class: Approx. 820 V
The power supply voltage is too high.
Decrease the voltage so it's within
specifications.
OH
(blinking)
Heatsink
Overtemp
Cooling Fin Overheating
The temperature of the Inverter's cool-
ing fins exceeded the setting in L8-02.
The ambient temperature is too high.
Install a cooling unit.
There is a heat source nearby.
Remove the heat source
The Inverter cooling fan has stopped.
Replace the cooling fan. (Contact
your Yaskawa representative.)
• A short-circuit bV,
−
V, and
AC terminals occurred.
• Overload in the control circuit ter-
minal.
• Make sure that incorrect wiring
has not been done.
• Check the resistance and wiring
for the frequency setting potenti-
ometer, etc. (Check that the cur-
rent for terV and –V is
20 mA or less.)
FAN
(blinking)
Cooling
Fan Fault
Inverter’s Cooling Fan Fault
An Inverter’s cooling fan fault was
detected.
This fault is detected when L8-32 is
set to 0.
The Inverter’s cooling fan has
stopped.
Replace the cooling fan. (Contact
our sales representative.)
OH2
(blinking)
Over Heat
2
Inverter Overheating Pre-alarm
An OH2 alarm signal (Inverter over-
heating alarm signal) was input from a
multi-function input terminal (S3 to
S7).
–
Clear the multi-function input ter-
minal's overheating alarm input.
TOE-S616-60.1.book 16 ページ ２０１７年８月４日 金曜日 午後３時４１分