Omron VARISPEED E7 User Manual page 254

Display Meaning
Main Circuit Undervoltage
The main circuit DC voltage is
below the Undervoltage Detection
Level (L2-05).
200 V class: Approx. 190 V
400 V class: Approx. 380 V
Main Circuit MC Operation Fail-
ure
The MC stopped responding dur-
ing Inverter operation. (Applica-
ble Inverter Capacities
200 V class: 37 to 110 kW
400 V class: 75 to 300 kW)
Control Power Fault
The control power supply voltage
dropped.
Inrush Current Prevention Cir-
cuit Fault
Overheating occurred in the inrush
resistor.
The MC did not respond for 10 s
after the MC ON signal has been
output.
Main Circuit Voltage Fault
The main circuit DC bus voltage
oscillates unusually (not when
regenerating).
Cooling Fin Overheating
The temperature of the Inverter's
cooling fin exceeded the setting in
L8-02 or 105°C.
OH: The temperature exceeded the
setting in L8-02 (Stopping method
can be changed by L8-03.).
( )
OH1: The temperature exceeded
105°C (Stopping method: Coast to
stop).
Inverter's Cooling Fan Stopped
Motor Overheating Alarm
The Inverter will stop or will con-
tinue to operate according to the
setting of L1-03.
Motor Overheating Fault
The Inverter will stop according to
the setting of L1-04.
Probable Causes
• An open-phase error occurred at the
input power supply.
• A momentary power loss occurred.
• The wiring terminals for the input
power supply are loose.
• The voltage fluctuations in the input
power supply are too large.
• A fault occurred in the inrush cur-
rent prevention circuit.
---
• The MC in the main circuit failed.
• The MC excitation coil is burned
out.
• An open-phase occurred in the input
power supply.
• A momentary power loss occurred.
• The wiring terminals for the input
power supply are loose.
• The voltage fluctuations in the input
power supply are too high.
• The voltage balance between the
phases is bad.
The ambient temperature is too high.
There is a heat source nearby.
The Inverter's cooling fan has stopped.
The Inverter's internal cooling fan has
stopped (200V, 37kW and 400, 75kW
or bigger).
The motor has overheated.
The motor has overheated.
Corrective Actions
Reset the fault after correcting its
cause.
• Try turning the power supply
off and on.
• Replace the Inverter if the fault
continues to occur.
• Try turning the power supply
off and on.
• Replace the Inverter if the fault
continues to occur.
Reset the fault after correcting its
cause.
Install a cooling unit.
Remove the heat source.
Replace the cooling fan. (Contact
your sales representative.)
Check the size of the load and the
length of the acceleration, deceler-
ation, and cycle times.
Check the V/f characteristics.
Check the motor temperature
input at terminal A2.
Check the size of the load and the
length of the acceleration, deceler-
ation, and cycle times.
Check the V/f characteristics.
Check the motor temperature
input at terminal A2.
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