ETEL DSC2P/DSC2V Servo Controller Debugging Guide

Guide to On site Debugging and Troubleshooting of ETEL DSC2P/DSC2V Series Digital Position Controllers

In the field of precision motion control, ETEL direct drive technology holds an important position in cutting-edge industries such as semiconductor manufacturing, precision machine tools, optical inspection, and life sciences due to its high dynamic response and high-precision positioning capabilities. Its DSC series digital position controller (including single axis DSC2P/DSC2V and dual axis DSCDP/DSCDL/DSCDM), combined with a proprietary Turbo TEL Bus (TEB) communication network, can achieve multi axis synchronization and interpolation motion. However, the debugging threshold for such highly integrated servo systems is relatively high. From initial power on, motor initialization (Phasing), zeroing (Homing) to regulator parameter tuning, any parameter mismatch at any stage can lead to system errors or even motor runaway. This article combines the core content of the DSC series operation and software manual (version F) to extract the most common fault phenomena and their troubleshooting strategies in on-site debugging, providing engineers with a practical reference for grounding gas.

Initial power on and communication establishment (ETEL Tools connection)

The DSC series controller communicates with the upper computer through the EBL2 (ETEL Bus Lite 2) protocol, with a default baud rate of 115200 bps. If using a single axis independent configuration, connect the PC serial port to the controller EBL2 port, open the ETEL Tools (ETT) software, and select the corresponding COM port in the Connection Chooser.

Typical fault: Communication cannot be established, and the status bar displays "Disconnected".

Troubleshooting steps:

Confirm that the PC serial port is not occupied by other software (such as terminal debugging tools).

Check if the LCD display screen of the controller has completed the self-test normally (such as displaying "DSC2P READY"). If there are no characters or abnormal display on the screen, it may be a power supply issue or hardware failure.

If you need to modify the baud rate, set it through parameter K195 (values 0/9600/19200/38400/57600/115200 correspond to different rates), execute SAV.<axis>=2 to save to Flash, and it will take effect after power failure and restart. The manual specifically states that K195 can only be read when powered on for the first time, and must be powered off and back on after modification.

In a multi axis configuration, the controller is connected through a TEB daisy chain, and the axis number is set by DIP switches or AXI commands. If there is a "BAD NOTE TEB ERR" (M64=59), it indicates that there are duplicate axis numbers on the TEB ring. It is necessary to check the DIP switch of each controller or reassign a unique axis number through AXI command (DSCDP/DSCDL/DSCDM are dual axis controllers, the first axis number must be even, and the second one automatically+1).

2、 Drive Setting and Motor/Encoder Selection

When using ETEL Tools for the first time, be sure to complete the system configuration through the "Drive Setting" tool. This process guides users step by step to select the controller model, motor model, encoder type, initialization mode, zeroing mode, and load mass/inertia.

2.1 Motor parameter errors leading to abnormal current

Section 8.3.2 of the manual states that if the motor model is selected incorrectly, the current limit and protection parameters (such as K83 overcurrent threshold, K84/K85 I ² t limit) will not match, which may result in motor winding burnout or controller overcurrent alarm (M64=2/3). If using a non ETEL standard motor, it is necessary to select "Other" and manually input peak current, continuous current, inductance, resistance, and back electromotive force constant (Ku).

Key parameters:

K240 (motor type): 0=linear motor, 1=rotary motor. This parameter affects the display conversion of position/velocity units in ETEL Tools.

K89 (number of phases and PWM frequency): For DSC2P, the typical value is 30 (three-phase, 24kHz PWM); For high inductance motors, 11/21/31 (12kHz PWM) can be selected. K89 error will result in "K89 BAD VALUE" (M64=41), and this parameter is only read when the controller is powered on. After modification, SAV and restart are required.

2.2 Encoder Configuration and Interpolation Factor (K77)

The interpolation factor of the simulated sine cosine encoder (1Vpp) is determined by parameter K77, with a range of 0-4 (DSC2P/DSC2V/DSCDP/DSCDM) or 0-7 (DSCDL), corresponding to 8-15 bit interpolation. The larger the K77, the higher the position resolution, but the maximum speed is limited by the controller calculation period (FTI). If K77 is set too high and causes position data overflow, it will trigger "ENCODER POS LOST" (M64=21) or "ENDAT OVERFLOW" (M64=16, for EnDat encoder).

On site experience: For most linear motor applications, K77=3 (11 bit interpolation) can provide sub micron resolution while ensuring sufficient tracking speed. If there is high-frequency vibration during motor operation, you can try reducing K77 or adjusting the encoder signal offset/amplitude correction parameters (K70~K73).