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‹ Alarm Detection
Alarms are Inverter protection functions that indicate unusual conditions without switching off the drive and
operating the fault output contact. The alarm automatically disappears when its cause is eliminated.
During an alarm condition, the Digital Operator/LED Monitor alarm display flashes and an alarm output is
generated at the multi-function outputs (H2-01 to H2-03) if programmed.
When an alarm occurs, take appropriate countermeasures according to the table below.
Table 7.3 Alarm Detection
Display
EF
External Fault
(flashing)
Meaning
Probable causes
Forward/Reverse Run Commands
Input Together
Both the forward and the reverse run Control sequence is faulty.
commands are input simultaneously for
500ms or more. This alarm stops the
motor.
Corrective Actions
Check external sequence logic, so
that only one input is received at a
time.
DC Bus Undervoltage
UV
DC Bus Undervolt
(flashing)
The following conditions occurred
• The DC bus voltage was below the
Undervoltage Detection Level Setting (L2-05).
• The MC of the inrush current prevention circuit was opened.
• The control power supply voltage
was below the CUV level.
For the probable reasons please have a For the corrective actions please
have a look at UV1, UV2 and UV3
look at UV1, UV2 and UV3 in table
in table 7.1
7.1.
UV Alarm is detected only, when the
drive is in stop condition
DC Bus Overvoltage
OV
DC Bus Overvolt
(flashing)
The DC bus voltage exceeded the overvoltage detection level.
200 V class: 410 VDC
400 V class: 820 VDC
Check the power supply and
The power supply voltage is too high. decrease the voltage to meet the
Inverter’s specifications
An OV Alarm is detected only, when
the drive is in stop condition.
Heatsink Overheat
OH
Heatsnk Overtmp
(flashing)
The ambient temperature is too high.
The temperature of the Inverter's cooling fin exceeded the temperature pro- There is a heat source nearby.
grammed in L8-02.
The Inverter cooling fan(s) has
Enabled when L8-03 = 3.
stopped.
Overtorque Detection 1
OL3
Car Stuck
(flashing)
The Inverter’s output current (V/f control) or the output torque (Vector conMotor was overloaded
trol) exceeded L6-02 for longer than
the time set in L6-03 and L6-01is set to
1 or 2.
Overtorque Detection 1
OL4
Car Stuck
(flashing)
The Inverter’s output current (V/f control) or the output torque (Vector conMotor was overloaded
trol) exceeded L6-02 for longer than
the time set in L6-03 and L6-01 is set to
1 or 2.
Check for dirt build-up on the fans
or heatsink.
7
Reduce the ambient temperature
around the Inverter
Replace the cooling fan(s).
Ensure the values in L6-02 and L603 are appropriate.
Check application/machine status
to eliminate fault.
Ensure the values in L6-05 and L606 are appropriate.
Check application/machine status
to eliminate fault.
7-9