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Error Codes (Standard)

Protective Functions

Note: Indicated inverter status could be different from actual inverter behavior. (e.g. When PID operation or frequency given by analog signal, although it seems constant speed,

acceleration and deceleration could be repeated in very short cycle.)

Output frequency Output current DC bus voltage Elapsed RUN time Elapsed power-ON time

: Power up or initial processing

: Stop

: Deceleration

: Constant speed

: Acceleration

: 0Hz command and RUN

: Starting

: DC braking

: Overload restriction

Trip cause

Inverter status

at trip point

How to access the details about the present fault

*1 The Major fault: When a memory error, CPU error and Ground fault.

Over Current Trip Over Voltage Trip Under Voltage Trip

Over Load Trip Major Failures

Other Failures

(Lighting(1sec) & Blink)

RUN

ALM

(Same Blink(1sec))

RUN

ALM

(Alternate Blink(1sec))

RUN

ALM

(Same Lighting)

RUN

ALM

(Light Out & Lighting)

RUN

ALM

(Light Out & Blink(1sec))

RUN

ALM

Error Codes (Operator)

Note 1: Reset operations acceptable 10 seconds after the trip. Note 2: If an memory error (E08) occurs, be sure to confirm the parameter data values are still correct.

Note 3:

Memory error may occer at power-on after shutting down the power while copying data with remote operator or initializing data. Shut down the power after completing copy or initialization.

Note 4: USP error occures at reseting trip after under-voltage error (E09) if USP is enabled. Reset once more to recover.

Note 5: Ground fault error (E14) cannot be released with resetting. Shut the power and check wiring.

Note 6: When error E08 error, it may be required to perform initialization.

Name Cause(s)

Display on digital

operator

Over current

The inverter output was short-circuited, or the motor shaft is locked or has a heavy load. These

conditions cause excessive current for the inverter, so the inverter output is turned OFF.

While at

constant speed

During

deceleration

During

acceleration

Others

Overload

protection *1

When a motor overload is detected by the electronic thermal function, the inverter trips and turns OFF its output.

Over voltage protection When the DC bus voltage exceeds a threshold, due to regenerative energy from the motor.

Memory error *2,3

When the built-in memory has problems due to noise or excessive temperature,

the inverter trips and turns OFF its output to the motor.

Under-voltage error

A decrease of internal DC bus voltage below a threshold results in a control circuit fault. This condition can also generate

excessive motor heat or cause low torque. The inverter trips and turns OFF its output.

Current detection error

If an error occurs in the internal current detection system, the inverter will shut off its output and display the error code.

CPU error A malfunction in the built-in CPU has occurred, so the inverter trips and turns OFF its output to the motor.

External trip

A signal on an intelligent input terminal configured as EXT has occurred. The inverter trips and turns OFF the output to

the motor.

USP *4

When the Unattended Start Protection (USP) is enabled, an error occurred when power is applied while a Run signal is

present. The inverter trips and does not go into Run Mode until the error is cleared.

Ground fault *5

The inverter is protected by the detection of ground faults between the inverter output and the motor during powerup

tests. This feature protects the inverter, and does not protect humans.

Input over-voltage

When the input voltage is higher than the specified value, it is detected 100 seconds after powerup and the inverter

trips and turns OFF its output.

Inverter thermal detection

system error

When the cooling fin thermal sensor in the inverter detect disconnection etc, inverter trips.

Inverter thermal trip

When the inverter internal temperature is above the threshold, the thermal sensor in the inverter module detects the

excessive temperature of the power devices and trips, turning the inverter output OFF.

Driver error

An internal inverter error has occurred at the safety protection circuit between the CPU and main driver unit.

Excessive electrical noise may be the cause. The inverter has turned OFF the IGBT module output.

Output phase loss

protection

Output Phase Loss Logic Detection (There are undetectable terms of use.)

Low-speed overload

protection

If overload occurs during the motor operation at a very low speed, the inverter will detect the overload

and shut off the inverter output.

Operator connection

failure

When the connection between inverter and operator keypad failed, inverter trips and displays the error code.

Communications error The inverter's watchdog timer for the communications network has timed out.