Alarm Detection - YASKAWA Varispeed E7 Instruction Manual And Parameter Description

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 when the cause of the alarm has been removed.
The Digital Operator display flashes and the alarm can be output at the multi-function outputs (H2-01 or H2-
02).
When an alarm occurs, take appropriate countermeasures according to the table below.
Display Meaning
Forward/Reverse Run Commands
Input Together
Both the forward and reverse run com-
(blink-
mands have been ON for more than
ing)
0.5 s.
Main Circuit Undervoltage
The following conditions occurred
when there was no Run signal.
• The main circuit DC voltage was
below the Undervoltage Detection
(blink-
Level Setting (L2-05).
ing)
• The inrush current limiting resistor
bypass contactor opened.
• The control power supply voltage
when below the CUV level.
Main Circuit Overvoltage
The main circuit DC voltage exceeded
the overvoltage detection level.
(blink-
200 V class: Approx. 400 V
ing)
400 V class: Approx. 800 V
Cooling Fin Overheating
The temperature of the Inverter's cool-
(blink-
ing fin exceeded the setting in L8-02.
ing)
Motor overheating
H3-09 is set to "E" and the motor tem-
(blink-
perature thermistor input exceeded the
ing)
alarm detection level.
Overtorque 1
There has been a torque higher than
(blink-
the setting in L6-02 for longer than the
ing)
time in L6-03.
External error detected for Com-
munications Card other than SI-K2
Continuing operation was specified
(blink-
for EF0 (F6-03 = 3)and an external
ing)
fault was input from the Option Card.
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Table 7.2 Alarm Displays and Processing
Probable causes
–
See causes for UV1, UV2, and UV3
faults in the previous table.
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.
The motor has overheated.
–
–
Protective and Diagnostic Functions
Corrective Actions
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.
See corrective actions for UV1, UV2,
and UV3 faults in the previous table.
Decrease the voltage so it's within
specifications.
Install a cooling unit.
Remove the heat source
Replace the cooling fan. (Contact your
Yaskawa representative.)
Check the size of the load and the
length of the acceleration, decelera-
tion, and cycle times.
Check the V/f characteristics.
Check the motor temperature input on
terminal A2.
• Make sure that the settings in L6-02
and L6-03 are appropriate.
• Check the mechanical system and
correct the cause of the overtorque.
Remove the cause of the external fault.
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