Connecting the controller
Note:
- EMC: Current-carrying cables – particularly around supply and motor cables – produce electromagnetic alternating fields. These can interfere with the motor and other devices.
- Suitable measures may be:
- ► Use shielded cables and earth the cable shielding on both ends over a short distance.
- ► Keep power supply and motor cables as short as possible.
- ► Use cables with cores in twisted pairs.
- ► Earth motor housing with large contact area over a short distance.
- ► Lay supply, motor and control cables separately.
Integrating the CPB in a motherboard
The minimum wiring varies depending on motor type and any present feedback (stepper or BLDC motor, Hall sensors/encoders). For commissioning, the connection of the voltage supply (X1 — voltage supply and motor) of the motor and of suitable EtherCAT wiring (ASIC, EEPROM) is sufficient.
The following table shows the necessary voltage rails and the requirements that your motherboard should satisfy for them. When calculating the current consumption, a low efficiency of 80% is assumed for the step-down converter.
| Voltage rail | Used for | Current consumption | Ripple permitted | Tolerance of the regulated voltage | Recommended topology |
|---|---|---|---|---|---|
| +10-12V | Gate-Drivers, +3.3V, +5V | 70…160 mA | 100 mV p-p | Step-down converter for main supply UB | |
| +5V | Encoder/ Hall, +3.3V | 150 mA max. | 100 mV p-p | Step-down converter for +10-12V | |
| +3.3V | MCU, OP_AMPs, FLASH | 140 mA min. | +/-3% | Low-dropout regulator (LDO) |
Note: There is no polarity reversal protection. Install a fuse in the supply line dimensioned according to the current consumption in your application.