Lenze 8400 Inverter Debugging Guide

H: Hot surface (may burn during operation)

3.2 Control terminals and pre allocation (Lenze factory settings)

When Lenze leaves the factory, the control mode "Terminals 0" is preset, and the terminal functions are as follows:

Terminal signal function

X3/A1U analog input (0~10V) main speed setpoint (10V=100% reference speed=1500 rpm, suitable for 4-pole asynchronous motors)

X3/O1U simulation output actual speed value (10V=100% reference speed)

X4/24E external 24V power supply (optional) provides separate power supply for control electronics

X4/RRR digital input controller enable (HIGH=enable; LOW=Forbidden)/Reset fault information

X4/DI1 digital input fixed speed 1 (40% reference speed)

X4/DI2 digital input fixed speed 2 (60% reference speed)

X4/DI3 digital input manual DC injection brake

X4/DI4 digital input rotation direction change

X4/DI5 digital input status "Drive ready"

X101 (relay) COM/NO status "Fault exists"

Differences in terminal allocation for different control modes: The manual compares four modes: Terminals 0, 2, 11, and 16. For example, in Terminals 2, DI3 is used for Quick Stop and DI4 is used for rotation direction selection. Users can choose the appropriate mode based on the application (parameter C00007).

Quick debugging process

4.1 Preparation work

Connect the power supply, motor, and control terminals according to the wiring diagram.

Power on the frequency converter (main power supply or external 24V) and check if the green LED "DRV-RDY" is flashing (indicating that the device is ready).

If using a keyboard, insert it into diagnostic interface X6 (hot plug allowed).

4.2 Loading Lenze factory settings

To obtain a definite initial configuration, it is recommended to load Lenze settings first. Operation steps (keyboard):

Go to the main menu → Code List → Select C00002/1 (Load Lenze setting).

Change the value to '1: On/start'.

After confirmation, the frequency converter will automatically restart and all parameters will be restored to factory values.

Note: This operation is only allowed when the controller is disabled (CINH).

4.3 Setting the basic parameters of the motor

Adjust the following parameters based on the motor nameplate (taking V/f linear control as an example):

Parameter name description Lenze factory value

C00015 V/f fundamental frequency setting motor rated frequency (such as 50Hz) 50.0 Hz

C00016 V/min boost low-frequency voltage boost, improving starting torque by 1.60%

C00011 reference speed corresponds to the 100% set point speed (such as 1500 rpm) of 1500 rpm

C00022 Imax motor mode maximum current limit (based on equipment power) equipment related

C00120 motor overload (I ² × t) overload protection threshold 100.00%

If the voltage on the motor nameplate is different from the grid voltage, the proportional relationship between C00173 (main power supply voltage) and C00015 needs to be adjusted.

4.4 Select Control Mode

Terminal control (default): C00007=10 (Terminals 0). The speed setpoint comes from the analog input A1U.

Keyboard control: C00007=20 (Keypad). The speed setpoint is set through C00728/3 on the keyboard.

4.5 Setting acceleration and deceleration time

C00012: Acceleration time (from 0 to reference speed, default 2.000 seconds)

C00013: Deceleration time (default 2.000 s)

C00105: Rapid stop deceleration time (default 2.000 s)

4.6 Enable the controller and operate it

Set terminal X4/RRR to HIGH (or use the RUN key on the keyboard).

Given speed set point (analog or keyboard value).

The motor should start rotating. The actual speed can be monitored in C00051.

Check the direction of rotation. If the opposite is true, the motor U and V phases can be exchanged, or the logic of reversing DI4 through parameter C00114 (or using C00727/3 keyboard direction control) can be used.

4.7 Save Parameters

All parameter changes must be explicitly saved to the memory module, otherwise they will be lost after power failure. Save method:

Keyboard: Press the SAVE function key.

PC software: Click on the toolbar save icon, or execute the device command C00002/11=1.

During the storage process, do not cut off the power or unplug the memory module.

Detailed explanation of key parameters

5.1 Analog Input Configuration (AIN1)

Parameter Function Description

C00034/1 AIN1 configuration 0=-10...+10V (default); 1 = 0…20mA；2 = 4…20mA

C00026/1 offset for zero adjustment (-1999.99%~1999.99%)

C00027/1 gain for range adjustment (default 1.0000)

C00010/1... 8 characteristic curve 8-point programmable nonlinear characteristic, used for dead zone or nonlinear sensors

Disconnecting monitoring: When selecting 4... 20mA, if the current is less than 4mA, a response can be triggered (C00598/1 setting response mode, default "TroubleQuickStop").

5.2 Fixed speed (JOG)

Three fixed speed values (percentage, relative to C00011):

C00039/1 = 40.00%

C00039/2 = 60.00%

C00039/3 = 80.00%

In Terminals 0 mode, select the binary combination of DI1 and DI2:

DI2=0, DI1=0 → Analog main setting

DI2=0, DI1=1 → Fixed speed 1

DI2=1, DI1=0 → Fixed speed 2

DI2=1, DI1=1 → Fixed speed 3

5.3 Motor Control Mode

C00006 Value Mode Applicable Scenarios

6 VFCplus: V/f linear standard asynchronous motor, constant torque load