Alarm Detection - Omron SYSDRIVE 3G3RV Series User Manual

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Alarm Detection

Alarms are detected as a type of Inverter protection function and do not operate the fault contact output. The
system will automatically return to its original status once the cause of the alarm has been removed.
The Digital Operator display flashes and the alarm is output from the multi-function outputs (H2-01 to H2-
03).
When an alarm occurs, take appropriate countermeasures according to the table below.
Display
Forward/Reverse Run Commands
(blink-
Input Together
ing)
Both the forward and reverse run com-
External
mands have been ON for more than
Fault
0.5 s.
Main Circuit Undervoltage
The following conditions occurred
when there was no Run signal.
• The main circuit DC voltage was
(blink-
below the Undervoltage Detection
ing)
Level Setting (L2-05).
DC Bus
• The surge current limiting contactor
Under-
opened.
volt
• The control power supply voltage
when below the CUV level.
Main Circuit Overvoltage
The main circuit DC voltage exceeded
(blink-
the overvoltage detection level.
ing)
200 V class: Approx. 400 V
DC Bus
400 V class: Approx. 800 V
Overvolt
(blink-
Cooling Fin Overheating
ing)
The temperature of the Inverter's cool-
Heatsnk
ing fins exceeded the setting in L8-02.
Over-
temp
Inverter Overheating Pre-alarm
An OH2 alarm signal (Inverter over-
(blink-
heating alarm signal) was input from a
ing)
multi-function input terminal (S3 to
Over
S7).
Heat 2
Motor overheating
(blink-
E was set for H3-09 and the motor
ing)
temperature thermistor input exceeded
Motor
the alarm detection level.
Over-
heat 1
-8
7
Table 7.2 Alarm Displays and Processing
Meaning
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.
Probable causes
-
-
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
dealer.)
Clear the multi-function input termi-
nal's overheating alarm input.
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
terminals A1 and A2.