Lenze 8400 motec frequency inverter – technical documentation and diagnostics

Assess error codes quickly

The Lenze 8400 motec is a decentralized frequency converter for motor-mounted or wall-mounted applications. The series is particularly relevant in conveyor systems, lifting technology and intralogistics systems.

This page is aimed at service technicians and maintenance personnel who need to diagnose a 8400 motec, assign a suitable replacement device or identify typical error patterns on connectors, hybrid cables and IP65-Anbindungen more quickly.

Series and product groups

Core technical data 8 values Model overview 10 sizes Pin assignment 5 connector Error codes 73 codes Spare parts Service instructions FAQ 4 Questions

How the Lenze error-code database is structured

The error-code search above is the main feature of this page. It displays the relevant information directly in each result without requiring additional subpages.

The tables further down show typical and frequently searched messages for technical orientation. Use the search field above to query the complete dataset.

Important: The tables below are representative excerpts for each product group. Use the error-code search above for the complete database.

Classification of the Lenze 8400 motec in practice

The Lenze 8400 motec is a decentralized frequency converter for motor-mounted or wall-mounted applications. In practice, the series is often used in conveyor systems, lifting technology and intralogistics systems where robust, compact and field-based drive solutions are required.

When troubleshooting, it is important that with the 8400 motec not only electrical parameters, but also connectors, hybrid cables, moisture, vibration load and the quality of the IP65-Anbindung play an important role. In practice, many faults do not arise directly in the power section, but rather at transitions and in the area of decentralized assembly.

If you are looking for Lenze 8400 motec error codes, Lenze 8400 motec technical data or Lenze 8400 motec connection assignment, you will find the most important information here in a structured technical overview.

Core technical data

For the first classification, the 8400 motec is particularly relevant for the power range, protection type, type of installation, connection concept and control method. Especially with decentralized systems, this overview helps to correctly assign the device and narrow down typical sources of errors more quickly.

Parameters	Value
Performance range	0,25–7,5 kW
Rated voltage	3 × 380–480 V AC ±10 %, 50/60 Hz
Protection class	IP65 (standard version)
Rules procedure	U/f characteristic curve, vector control (VFCplus / SLVC)
Ambient temperature	0–40 °C
Assembly	Directly on the motor or wall-mounted (decentralized topology)
Connection	Connector, hybrid cable (power + control)
Communication	AS-Interface or CANopen via separate plug-in modules

Model overview and order number system

The order number of the 8400 motec follows the pattern E84DGV + design + performance code + voltage code. In practice, this system is particularly important when a device has to be identified based on the nameplate or an existing article number.

The following overview refers to models for 3 × 400 V. This means that the appropriate performance class can be quickly assigned to the correct order number.

Order number	Rated power
E84DGVB37242PS	0,37 kW
E84DGVB55242PS	0,55 kW
E84DGVB75242PS	0,75 kW
E84DGVB11342PS	1,1 kW
E84DGVB15342PS	1,5 kW
E84DGVB22342PS	2,2 kW
E84DGVB30342PS	3,0 kW
E84DGVB40342PS	4,0 kW
E84DGVB55342PS	5,5 kW
E84DGVB75342PS	7,5 kW

Pin assignment – connector X1/X2/X3/X4

Unlike classic frequency inverters with a terminal block, the 8400 motec works with plug connectors. In practice, it is precisely this design that is often a decisive factor in malfunctions when plug connections are not seated neatly or environmental influences such as moisture and vibrations play a role.

Plug	Designation	Function/Note
X1	Mains connection	L1, L2, L3, PE – hybrid plug (power + control in one cable)
X2	Motor connection	U, V, W, PE – three-phase motor connection
X3	Control signals	Controller enable, setpoint (analog), digital inputs, status output
X4	Brake connection	Optional – connection of external braking resistor
X106	Engine temperature	T1/T2 – PTC/KTY-Engine temperature monitoring

Error codes and fault diagnosis

The following table lists the documented error messages of the 8400 motec. The display appears on the display or via the diagnostic parameter. Messages of the Fault type usually require manual acknowledgment, while Warnings can disappear automatically after the cause has been eliminated.

Note: Tip: The error memory can be accessed via the diagnostic parameter C00168. When installing decentrally in the IP65 version, you should always check whether all connectors are correctly seated and tight. Moisture and vibrations are among the most common causes of problems in practice.

Code	Description	Cause	Remedy
An01	AIN1_I < 4 mA	Wire break monitoring for analog input 1 has triggered. Only when configured as a 4...20 mA current loop.	Check the wiring of the analog input X3/A1I for a wire break. Check minimum current values of the signal sources.
CA06	CAN CRC Error	CAN onboard: An incorrect CAN-telegram was detected.	Check wiring and bus terminating resistance. EMV-Eliminate malfunctions.
CA07	CAN Bus warning	CAN onboard: More than 96 incorrect CAN- telegrams sent or received.	Check wiring and bus terminating resistance. Same baud rate. Different IDs. EMV-Eliminate malfunctions.
CA08	CAN Bus stopped	CAN onboard: Device has received Stop Remote Node NMT-telegram.	CAN-Check master.
CA0F	CAN control word	Bit 14 SetFail in the control word was set.	Trace signal source on the CAN-bus that sets bit 14.
CA0b	CAN HeartBeatEvent	Heartbeat telegram not received within the defined time.	Reactivate the heartbeat producer by restarting or CAN reset node. Adjust heartbeat time.
CE1	CAN RPDO1	Time monitoring for RPDO1 has triggered.	Set the correct telegram length. EMV-Eliminate malfunctions. Adjust monitoring time.
CE2	CAN RPDO2	Time monitoring for RPDO2 has triggered.	Set the correct telegram length. Adjust monitoring time.
CE3	CAN RPDO3	Time monitoring for RPDO3 has triggered.	Set the correct telegram length. Adjust monitoring time.
CE4	CAN Bus off	Too many incorrect telegrams, damaged cable or duplicate ID.	Check wiring and bus terminating resistance. Same baud rate. Assign different IDs. EMV-Eliminate malfunctions.
CP04	CAN RPDO4	Time monitoring for RPDO4 has triggered.	Set the correct telegram length. Adjust monitoring time.
FC01	Switching frequency reduction	Load-dependent switching frequency reduction.	Comply with load requirements. Correct dimensioning or reduce dynamics.
FC02	Maximum speed for Fchop	Maximum speed for chopper frequency reached.	Select maximum speed depending on the switching frequency.
FC03	Limit field controller	Output of the field controller has reached the maximum limit.	Comply with load requirements. Correct dimensioning or target value.
Id1	Motor data identification error	Error during engine parameter identification.	Check motor connections. Correct start parameters. Ensure power supply.
Id3	CINH Engine data identification	Controller inhibit during motor data identification.	Do not set a controller lock during motor data identification.
Id4	Resistor identification error	Cable cross-section or cable length implausible.	Enter sensible values for the cable cross-section and cable length.
LP1	Motor phase failure	One motor phase carries less current than set.	Check motor connections and plugs. Check trigger threshold.
OC1	Power section short circuit	Motor phase short circuit detected. Often faulty motor connections.	Check motor connections and plugs. Only use permitted combinations of device power and motor power.
OC10	Maximum current reached	Maximum current has been reached.	Check load dimensioning. Check maximum current settings.
OC11	Clamp operation active	Overcurrent limiting clamp activated.	Reduce the dynamics of setpoint generation or motor load.
OC12	I2xt Brake resistor overload	Braking processes that are too frequent and too long.	Check drive design.
OC13	Exceeding maximum current for Fch	Motor current exceeds maximum current limit at fixed switching frequency.	Pay attention to the maximum current setting and switching frequency. Reduce load or use dynamic switching frequency.
OC14	Limitation of series current controller	Limitation of the series current controller active.	Comply with load requirements. Correct dimensioning or dynamics.
OC15	Limitation of cross-current controller	Limitation of the cross current controller active.	Comply with load requirements. Correct dimensioning or dynamics. Check current controller parameters.
OC16	Torque controller limitation	Actuator limitation according to speed controller.	Comply with load requirements. Correct dimensioning or dynamics.
OC17	Clamp sets pulse lock	Brief overcurrent with brief inverter shutdown.	Check load dimensioning. Reduce the dynamics of setpoint generation.
OC2	Power section ground fault	Ground fault detected on a motor phase.	Check motor connections and plugs. Use recommended motor filters, cable lengths and cable types.
OC5	Ixt overload	Ixt overload check triggered.	Check the dimensioning of the device and motor load. Reduce load cycles.
OC6	I2xt Motor overload	Motor thermal overload.	Comply with load requirements. Correct sizing. Check Vmin Boost at VFCplus.
OC7	Motor overcurrent	Instantaneous value of the motor current has exceeded the limit.	Check load dimensioning and correct if necessary.
OH1	Overtemperature heat sink	Heat sink temperature is greater than limit temperature.	Check ambient temperature. Clean filters and regulators. Ensure adequate cooling.
OH3	Motor temperature X106 triggered	Motor temperature monitoring on X106 has triggered.	Check engine temperature monitoring. Ensure engine cooling. Check lines.
OH4	Heatsink temp. > Switch-off temp. -5°C	Heatsink temperature is approaching shutdown temperature.	Prevent further warming. Reduce motor load or set controller lockout.
OS1	Maximum speed limit reached	Maximum speed limit reached.	Limit setpoint specification to maximum values. Adjust speed and frequency limitation.
OS2	Max. engine speed	Maximum permissible engine speed reached.	Limit the setpoint specification to the maximum permissible engine speed. Adjust max. engine speed.
OT1	Maximum torque reached	Maximum possible torque reached on the motor shaft.	Reduce engine load.
OT2	Speed controller output limited	Output of the speed controller has reached the internal limit.	Comply with load requirements. Correct dimensioning or reduce dynamics.
PS01	No memory module	Memory module not present or not properly engaged.	Insert memory module. Check correct fit.
PS02	Par.set invalid	Parameter set in the memory module is invalid or incompletely saved.	Ensure power supply during saving process.
PS03	Par.set device invalid	Parameter set in the memory module incompatible with the basic device.	Please note downward compatibility when replacing modules.
PS04	Par.set MCI invalid	MCI-Parameter set incompatible with the communication module.	Please note downward compatibility when replacing modules.
PS07	Par. memory module invalid	Memory module parameters invalid.	Check or replace memory module.
PS08	Par.set device invalid	Device parameters invalid.	Check device parameters.
PS09	Par. format invalid	Parameter format invalid.	Check parameter format.
PS10	Memory module binding invalid	Memory module binding invalid.	Check memory module binding.
Sd3	Wire break feedback system	HTL-Encoder cable interrupted or HTL-Encoder defective.	HTL-Check encoder cable, encoder and terminals. Deactivate monitoring if encoder is not used.
Su02	A network phase is missing	With a three-phase supply, one mains phase has failed.	Check mains connection.
Su03	Switching on the mains too frequently	The power unit was switched on and off too frequently.	Acknowledge error by switching mains. Observe cooling times.
Su04	CU inadequately supplied	24-V-Versorgung of the control electronics too low.	Acknowledge supply and check voltage stability.
Su06	Mains input overload	Overtemperature in the input rectifier or the mains choke.	Check whether all mains phases are connected. Ensure adequate cooling.
US01	User error 1	Custom error.	Application dependent.
US02	User error 2	Custom error.	Application dependent.
US03	User error 3	Custom error.	Application dependent.
US04	User error 4	Custom error.	Application dependent.
US05	User error 5	Custom error.	Application dependent.
US06	User error 6	Custom error.	Application dependent.
US07	User error 7	Custom error.	Application dependent.
US08	User error 8	Custom error.	Application dependent.
dF10	AutoTrip Reset	Too frequent auto-trip reset.	Troubleshoot common errors.
dF14	SW-HW invalid	Software or hardware incompatibility.	Check device and software status.
dF18	BU RCOM error	Basic unit RCOM error.	Power switching or restart.
dF21	BU Watchdog	Basic unit watchdog.	Power switching or restart.
dF22	CU Watchdog	Watchdog control unit.	Power switching or restart.
dF25	CU RCOM error	Control unit RCOM error.	Power switching or restart.
dF26	Appl. Watchdog	Application watchdog.	Check application.
dF50	Retain error	Retain memory error.	Mains switching.
dF51	CuCcr error	CU-CCR Error.	Mains switching.
dF52	BuCcr error	BU-CCR Error.	Mains switching.
dH09	EEPROM power section	EEPROM of the power section incorrect.	Replace device.
dH10	Fan failure	Fan failure detected.	Clean or replace fans.
dH68	Synchronization data error CU	Calibration data from the control unit is incorrect.	Replace device.
dH69	Synchronization data error BU	Basic unit calibration data incorrect.	Replace device.

Spare parts and typical wear issues

Typical wearing parts for the 8400 motec are connector seals for the IP65-Schutz, fans for larger sizes, memory modules and intermediate circuit capacitors. Regular visual inspection of the connectors and seals makes sense, especially for decentrally mounted devices in harsh environments.

Before replacing a device, the parameter set should be saved via the memory module. This makes the commissioning of a replacement device significantly easier and reduces downtime.

Shop & Inquiry

Lenze 8400 motec devices and spare parts

After the technical classification, the direct route to the right replacement device, compatible spare parts or a specific product inquiry is usually the most sensible next step.

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Compare other Lenze series

If you are looking for error codes for another Lenze series, you will also find additional technology pages for Lenze 8200 vector and Lenze EVS9300. This allows you to narrow down the right series more quickly.

Lenze 8200 vector Lenze EVS9300

FAQ for Lenze 8400 motec

Which errors occur particularly frequently with the Lenze 8400 motec?

CAN-Communication errors, overcurrent messages, temperature errors and supply problems are common. Because of the decentralized IP65-Montage, plug connectors, seals and hybrid cables should also be checked particularly carefully.

What is the 8400 motec typically used for?

The 8400 motec is often used in conveyor systems, lifting technology and intralogistics. Its decentralized design is interesting wherever drives need to be installed close to the motor.

Which connections are particularly important when troubleshooting?

Particularly relevant are the mains connection X1, the motor connection X2, the control signals on X3 and the motor temperature monitoring on X106. In many cases it is also worth checking that all connectors are secure and tight.

How can the correct 8400 motec be identified based on the order number?

The order number contains information on the design, performance code and voltage code. This allows the device to be assigned to a specific performance class within the 8400-motec-Baureihe.

Disclaimer and safety notice

The information on this page has been compiled with the greatest care and is based on many years of practical experience with Lenze frequency converters. However, they do not replace the official Lenze documentation and serve exclusively as a guide for qualified specialist personnel.

Work on frequency converters may only be carried out by qualified electricians in accordance with DIN VDE 0105-100. Danger to life due to residual voltage in the DC link: After switching off, wait at least 10 minutes or adhere to the waiting time specified by the manufacturer.

REHA-Industrial components assumes no liability for damages resulting from the use of this information. Lenze is a registered trademark of Lenze SE.