Over-current event while at constant speed
Over-current event during deceleration
Over-current event during acceleration
Over-current event during other conditions
Overload protection *
Braking resistor overload protection
EEPROM error *
Current detection error
CPU error *
Ground fault *
Inverter thermal trip
CPU communication error
Main circuit error *
Driver error *
Low-speed overload protection
Modbus communication error
EzSQ invalid instruction
EzSQ nesting count error
EzSQ instruction error
EzSQ user trip (0 to 9)
Positioning range error
*1: Reset operations acceptable 10 seconds after the trip.
*2: The inverter will not accept any reset command after an EEPROM error (E08), CPU error (E11), Ground fault (E14) or Driver error (E30) occurs with error code displayed. Turn off the inverter power once. If error is displayed when
the inverter power is turned on subsequently, the internal memory device may have failed or parameters may have not been stored correctly. In such cases, initialize the inverter, and then re-set the parameters.
*3: Reset cannot be released with the STOP/RESET key. Please reset it with the inverter power or reset terminal (18:RS).
How to access the details about the present fault
at trip point
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.)
Stöwer Antriebstechnik GmbH, Enneststrasse 3, 51702 Bergneustadt, tel: 02261-40970, Fax: 02261-41309
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.
The dual-voltage motor is wired incorrectly.
When a motor overload is detected by the electronic thermal function, the inverter trips and turns OFF its output.
When the BRD operation rate exceeds the setting of "b090", this protective function shuts off the inverter output and displays the error code.
When the DC bus voltage exceeds a threshold, due to regenerative energy from the motor.
When the built-in EEPROM memory has problems due to noise or excessive temperature, the inverter trips and turns OFF its output to the motor.
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.
If an error occurs in the internal current detection system, the inverter will shut off its output and display the error code.
A malfunction in the built-in CPU has occurred, so the inverter trips and turns OFF its output to the motor.
A signal on an intelligent input terminal configured as EXT has occurred. The inverter trips and turns OFF the output to the motor.
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.
The inverter is protected by the detection of ground faults between the inverter output and the motor upon during powerup tests.
This feature protects the inverter, and does not protect humans.
The inverter tests for input over-voltage after the inverter has been in Stop Mode for 100 seconds. If an over-voltage condition exists,
the inverter enters a fault state. After the fault is cleared, the inverter can enter Run Mode again.
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.
When communication between two CPU fails, inverter trips and displays the error code.
The inverter will trip if the power supply establishment is not recognized because of a malfunction due to noise or damage to the main
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.
When a thermistor is connected to terminals  and [L] and the inverter has sensed the temperature is too high, the inverter trips and
turns OFF the output.
When "01" has been specified for the Brake Control Enable (b120), the inverter will trip if it cannot receive the braking confirmation
signal within the Brake Wait Time for Confirmation (b124) after the output of the brake release signal.
Safe stop signal is given.
If overload occurs during the motor operation at a very low speed, the inverter will detect the overload and shut off the inverter output.
When the connection between inverter and operator keypad failed, inverter trips and displays the error code.
When "trip" is selected (C076=00) as a behavior in case of communication error, inverter trips when timeout happens.
The program stored in inverter memory has been destroyed, or the PRG terminal was turned on without a program downloaded to the inverter.
Subroutines, if-statement, or for-next loop are nested in more than eight layers
Inverter found the command which cannot be executed.
When user –defined trip happens, inverter trips and displays the error code.
The inverter detects errors in the option board mounted in the optional slot. For details, refer to the instruction manual for the
mounted option board.
If the encoder wiring is disconnected, an encoder connection error is detected, the encoder fails, or an encoder that does not support
line driver output is used, the inverter will shut off its output and display the error code shown on the right.
If the motor speed rises to "maximum frequency (A004) x over-speed error detection level (P026)" or more, the inverter will shut off its
output and display the error code shown on the right.
If current position exceeds the position range (P072-P073), the inverter will shut off its output and display the error code.
: Power up or initial processing
: Constant speed
: 0Hz command and RUN
DC bus voltage
Elapsed RUN time
: DC braking
: Overload restriction
Elapsed power-ON time