TI120 Series Variable Frequency Drive
Fault Diagnosis and Countermeasures
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Fault code
Failure
Display
Fault name
Cause
Countermeasure
Large load fluctuation
Check load
7
Er.Lu1
variable
frequency
drive
under-voltage
The input terminal voltage of
the variable frequency drive is
not within the range required
by the specification.
Adjust voltage to normal range
Momentary interruption
Reset fault
Abnormal bus voltage
Seek technical support
Abnormal rectifier bridge and
buffer resistance
Seek technical support
Abnormal driving plate
Seek technical support
Abnormal control plate
Seek technical support
8
Er.Cur
Current
detection fault
Abnormal connection between
control plate and driving plate
Check the cable and reset it
Abnormal control plate current
detection circuit
Seek technical support
Abnormal driving plate current
detection circuit
Seek technical support
Damaged current sensor
Seek technical support
Damaged switch power supply
Seek technical support
9
Er.CPU
System
interferenc
Serious external interference
signal
Seek technical support
10
Er.FAL
Module
protection fault
Output interphase short circuit
or short circuit to ground
Check motor wiring and output
impedance to ground
Over-voltage or over-current
Process according to the
over-voltage and over-current
method
Loose connection of control
plate
Reset the control plate connector
Direct connection of variable
frequency drive module
Seek technical support
Abnormal control plate
Seek technical support