Fault diagnosis of LTi CDE/CDB3000

The key measures for EMC installation include: using star shaped connections for protective conductors, and connecting all protective conductor terminals to the PE row inside the cabinet; Separate the wiring of motor cables, power cables, and control cables; Use double copper braided shielded cables with a coverage rate of 60% to 70%; Shielded cables must be used for analog input and output; Inductive loads such as contactors, relays, and solenoid valves must be equipped with suppression circuits and placed as close as possible to the coils; The signal line should enter the cabinet from one side as much as possible. The control terminal must use shielded cables with a maximum cross-sectional area of 1.5 mm ². The encoder cable cannot be disconnected or connected through terminals. The TTL/SSI encoder uses the X7 interface, the Resolver uses the X6 interface, and the HTL encoder can be connected through the X2 terminal.

STO (Safe Torque Off) is an important safety feature of CDE/CDB3000. CDE3000 achieves dual channel shutdown through ENPO and ISDSH inputs, while CDB3000 and SH achieve it through ENPO and ISD00 inputs. STO complies with EN 61800-5-2, EN 954-1 Category 4, EN ISO 13849-1 PL e, and EN 61508 SIL 3. In the STO state, the motor, main power cable, braking resistor, and DC bus cable still carry dangerous voltage without electrical isolation. If there is a suspended load or external force, additional mechanical brakes, safety bolts, or clamping devices must be used. STO must be retested after calibration, system wiring changes, or equipment replacement. Feedback relay RSH or OSD02 is used to diagnose whether two channels are operating simultaneously.

Debugging steps and preset solutions

Before debugging, it is necessary to confirm that all electrical connections are correct and ENPO is at a low level to prevent accidental motor start-up. After power on, the device will perform a self check, with LED H1, H2, and H3 displaying red, yellow, and green status respectively.

Debugging can be done through DRIVE MANAGER software, KEYPAD KP300, or SMARTCARD. When batch debugging, you can first fully debug the first drive, save the data to a file, and then download it to other drives with the same configuration in sequence. During initial debugging, DRIVE MANAGER will guide the user to select a preset solution. There are 20 preset solutions, covering analog speed control, fixed speedometer, CANopen, PROFIBUS, PLC control, table positioning, DSP402 mode, etc. Common presets include SCT_1 (± 10 V analog, I/O terminal start), SCC_2 (fixed speedometer, CANopen), SCB-2 (fixed speedometer, PROFIBUS), PCT2 (table positioning, I/O terminal), etc.

After selecting the preset solution, it is necessary to set up the motor and encoder. The motor database contains parameters for LTi motors and third-party motors. After selecting the correct data, motor protection, control circuits, and electrical parameters will be automatically configured. Encoder settings require selecting an encoder combination, such as TTL motor encoder+TTL position encoder, Resolver+TTL, SSI+TTL, etc. When checking the encoder, manually rotate the motor shaft and observe the actual speed displayed in DRIVE MANAGER: clockwise should be positive, counterclockwise should be negative. If the direction is incorrect, check the encoder cable and type.

The basic settings include reference value scaling, speed curve, limiting, stopping slope, etc. For example, analog input+10 V corresponds to 100%, and -10 V corresponds to -100%. After setting up, you must click "Store setting in device" to save. During the test run, first enable STO, then enable ENPO, select speed control through DRIVE MANAGER, set 100 rpm, and observe the step response. The solver system has an overshoot of about 20%, and the incremental encoder has an overshoot of about 30%. If the torque setting value reaches its maximum, the speed step should be reduced. The test run can determine whether the motor phase sequence, encoder connection, and parameters are correct.

LED status and error codes

The front panel of CDE/CDB3000 has three LEDs: H1 red, H2 yellow, and H3 green. Green lights up when the power is turned on; After ENPO is enabled, the green and yellow colors become bright; Yellow flashing during operation or self-tuning; Yellow flashing during warning; Red flashes when there is an error. The flashing frequency of the red LED corresponds to the error code, and KEYPAD will display the abbreviation.

Common error codes:

1 blink: E-CPU, comprehensive error, specific code needs to be read through KEYPAD or DRIVE MANAGER.

2 flashes: E-OFF, undervoltage shutdown, check the power supply, normal power outage may also occur briefly.

Three flashes: E-OC, current overload shutdown, possible short circuit, ground fault, motor coil fault, parameter error, or improper slope setting.

4 flashes: E-OV, voltage overload shutdown, check the main power supply voltage; If it is caused by regenerative braking, the braking ramp can be slowed down or a braking resistor can be used.

5 flashes: E-OLM, motor protection turned off, motor overload, check process cycle and motor selection.