Omron VARISPEED F7 Quick Manual page 23

Display
OC
Over Current
OH
Heatsnk Overtemp
OH1
Heatsink Max Temp
OL1
Motor Overload
OL2
Inv Overload
OS
Overspeed Det.
OV
DC Bus Overvolt
PF
Input Phase Loss
PGO
PG Open
EN-22
Alarm Fault
Over Current
The Inverter's output current exceeded the over-
current detection level.
Heatsink Overheat
L8-03 = 0,1 or 2 and the temperature of the
Inverter's cooling fin exceeded the L8-02 value.
Inverter's Cooling Fan Stopped
L8-03 = 3 or 4 and the temperature of the
Inverter's cooling fin exceeded the L8-02 value.
Heatsink Overheat
The temperature of the Inverter's heatsink
exceeded 105 °C.
Inverter's Cooling Fan Stopped
Motor Overload
Detected when L1-01 is set to 1,2 or 3 and the
Inverter's I²t value exceeded the motor overload
curve.
The overload curve is adjustable using parame-
ter
E2-01 (Motor Rated Current), L1-01 (Motor Pro-
tection Selection) and L2-02 (Motor Protection
Time Constant)
Inverter Overload
The Inverter output current exceeded the Invert-
ers's overload capability
F1-03 = 0, 1 or 2 and A1-02 = 1 or 3
The motor speed feedback (U1-05) exceeded
the setting in F1-08 for a time longer than the
setting of
F1-09
F1-03 = 3 and A1-02 = 1 or 3
The motor speed feedback (U1-05) exceeded
the setting in F1-08 for a time longer than the
setting of
F1-09
The DC bus voltage has exceeded the overvolt-
age detection level.
(only in
Default detection levels are:
stop
condi- 200 V class: 410 VDC
tio)
400 V class: 820 VDC
Input Phase Loss
Too big DC bus voltage ripple.
Only detected when L8-05=1 (enabled)
PG Disconnection
Detected when F1-02 = 0, 1 or 2 and A1-02 = 1
or 3.
Detected when no PG (encoder) pulses have
been received for a time longer than the setting
in F1-14.
PG Disconnection
Detected when F1-02 = 3 and A1-02 = 1 or 3.
PG (encoder) pulses have not been received for
a time longer than the setting in F1-14.
Meaning
• Remove the motor and run the Inverter
without the motor.
• Check the motor for a phase-to-phase
short.
• Verify the accel/decel times (C1-
• Check the Inverter for a phase-to-phase
short at the output.
• Check for dirt build-up on the fans or heat-
sink.
• Reduce the ambient temperature around
the drive.
• Replace the cooling fan(s).
• Check for dirt build-up on the fans or heat-
sink.
• Reduce the ambient temperature around
the drive.
• Replace the cooling fan(s).
• Recheck the cycle time and the size of the
load as well as the accel/decel times
(C1-
• Check the V/f characteristics (E1-
• Check the setting of Motor Rated Current
Setting (E2-01).
• Recheck the cycle time and the size of the
load as well as the accel/decel times
(C1-
• Check the V/f Characteristics (E1-
• Check if the inverter rated current matches
the motor rated current.
• Adjust the ASR settings in the C5 parame-
ter groupt
• Check the reference circuit and reference
gain.
• Check the settings in F1-08 and F1-09
• Increase the deceleration time (C1-02/04)
or connect a braking option.
• Check the power supply and decrease the
voltage to meet the inverter's specifica-
tions.
• Check the braking chopper / resistor.
• Tighten the input terminal screws
• Check the power supply voltage
• Fix the broken/disconnected wiring.
• Supply power to the PG properly.
• Check the sequence and if the brake is
opened when the inverter starts to increase
the speed.
Corrective Actions
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