TI120 Series Variable Frequency Drive
Fault Diagnosis and Countermeasures
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Chapter 6 Fault Diagnosis and Countermeasures
6.1 Fault List and Countermeasures
The variable frequency drive may encounter the following fault types during use. Please refer to the list
countermeasures for simple troubleshooting.
Fault code
Failure
Display
Fault name
Cause
Countermeasure
1
Er.oc1
Over-current
in
acceleration
Torque boost value is too large
at scalar control
Reduce torque boost value
Great starting frequency
Reduce the starting frequency value
Short acceleration time
Prolong acceleration time
Improper setting of motor
parameters
Correct setting of motor nameplate
Weight overload
Reduce overload
Restart the rotating motor
Reduce the current limit value or
start with speed search
Output interphase short circuit
or short circuit to ground
Check motor wiring and output
impedance to ground
V/F curve is not suitable at
scalar control
Correct set of V/F curve
2
Er.oc2
Over-current
during
deceleration
Short deceleration time
Prolong deceleration time
There is no additional brake
unit and brake resistor
Add braking unit and resistance
3
Er.oc3
Over current in
constant
speed
Small variable frequency drive
power level
Select the appropriate variable
frequency drive power
Low grid input voltage
Check grid voltage
Weight overload
Reduce overload
4
Er.ou1
Over-voltage
during
acceleration
Abnormal input voltage
Check grid voltage
Short acceleration time
Prolong acceleration time
Large load inertia
Use energy braking
5
Er.ou2
Over-voltage
during
deceleration
Short deceleration time
Prolong deceleration time
Abnormal input voltage
Check grid voltage
Large load inertia
Use energy braking
6
Er.ou3
Over-voltage
in constant
speed
Abnormal input voltage
Check grid voltage
