Siemens SINUMERIK 840C CNC System Installation and Debugging Guide

Machine tool data dialogue (MDD - software version 3 and above)

MDD provides a graphical data input interface, replacing the traditional list input method.

1. NC configuration and machine tool data

In the NC configuration screen, the attribution relationship between channels, axes, spindles, and mode groups can be set, and axis names, axis types (straight/rotary), virtual and real axes, etc. can be defined. Subsequent NC machine tool data will be displayed grouped by function, including:

General NC MD

Geometry and Motion

Channel related data

Axis related data (basic data, monitoring and limiting, speed, measurement system, controller data, etc.)

Spindle related data

Gearbox interpolation data

Memory configuration data (software version 4 and above)

The allocation of set values/actual values is a key step before driving debugging, and the corresponding driving/measuring circuit module number needs to be correctly set in the basic MD of the shaft or spindle.

The adaptive function of the measurement system (software version 4 and above) can automatically calculate the position control resolution and measurement system resolution, optimizing closed-loop control. After the user inputs parameters such as screw pitch, grating pitch, encoder pulse per revolution, pulse doubling, etc., the system automatically calculates and fills in the corresponding MD.

2. PLC configuration and machine tool data

The PLC configuration screen is used to configure the availability, address, lathe type (T/TT), and directional key processing method (processed by the PLC operating system or user program) of two machine tool control panels. PLC machine tool data is divided into peripheral device settings, alarm messages, PLC basic data, user MD, tool management, computer links, and other areas.

3. Driver configuration and machine tool data

The driver configuration screen is used to activate and configure the actual FDD (feed drive) and MSD (spindle drive) modules. The user needs to select the module model and change its status from "passive" to "active". After completion, the 'Accept Configuration+NCK Power On' soft key must be used to update the boot files on the hard drive and initialize the driver bus.

Detailed grouping of driving machine tool data, including:

Motor/power unit data

Monitoring and Restrictions

message data

Measurement system data

Controller data (speed loop, current loop, etc.)

Status data

Digital driven startup: can be done by loading an existing TEA3 file or through the standard startup process (selecting module and motor model). The system will preset driving parameters using standard data from the controller. For non Siemens motors, manual input of motor data is required, followed by the use of the 'Calculate Controller Data' function.

4. File function

MDD supports managing data files at three levels:

Level 1: Machine Configuration: Manage data files for all areas (TEA1, TEA2, TEA3, etc.), and can save or load the entire machine configuration at once.

Level 2: Each data area: manages drivers NC、PLC、 Loop and IKA data files.

Level 3: Sub regions within each data area: finer file management.

The user display function allows users to customize the list of machine tool data they are most concerned about, and configure it through the "Edit List" soft key to improve debugging efficiency.

Installation and commissioning of shafts and spindles

This is a crucial stage in integrating the control system with the physical axis of the machine tool.

1. Shaft installation

Drive optimization: Check and set the control direction of the feed axis; Perform speed setting value matching/speed measurement machine compensation; Set servo gain factor Kv; optimize acceleration and acceleration limits; Configure location monitoring and dynamic contour monitoring.

Drift compensation: compensates for position deviation when stationary.

Axis motion test: Test axis motion in jog mode and program control mode.

Reference point proximity: Configure different zeroing methods (with/without automatic direction recognition, program control, no motion zeroing, etc.). For the reference markers of distance encoding, initial installation settings are required.

2. Spindle installation

Control modes: including open-loop control mode, oscillation mode, and positioning mode (M19).

Detailed explanation of positioning mode: involving absolute and incremental positioning sequences, gain factor changes, positioning termination, etc.

Acceleration feature (software version 4 and above): configurable curve acceleration feature.

PLC intervention: PLC can intervene in the spindle control process.

Data backup and CPU replacement

1. Data backup method

Streaming tape drive: Fully backup MMC hard disk data.

V24 interface or floppy drive: transfers specific data files.

Hard disk boot: The control system can be started using user data.

2. CPU replacement process

After replacing the MMC CPU or NCK CPU, data needs to be restored from the backup. For MMC CPUs, "system recovery" is typically performed using a streaming tape drive. For NCK, system programs and user data need to be loaded through the V24 interface or network.