YASKAWA Varispeed E7 Instruction Manual And Parameter Description page 250

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 Failure
The MC stopped responding during
Inverter operation. (Applicable
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 Circuit
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 oscil-
lates unusually (not when regenerat-
ing).
Cooling Fin Overheating
The temperature of the Inverter's cool-
ing 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 continue
to operate according to the setting of
L1-03.
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Table 7.1 Fault Displays and Processing (Continued)
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. Replace the cooling fan. (Contact
The Inverter's cooling fan has stopped.
The motor has overheated.
Protective and Diagnostic Functions
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.
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.
3
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