SE bus-controlled stepper driver series

The SE-20806C manual specifies 250 kbit/s when SW6 selects the hardware configuration. Its communications configuration supports 20, 50, 100, 125, 250, 500 and 1000 kbit/s and states that baud-rate changes require power cycling. Request the matching object dictionary and device description for the firmware, then agree the node address, controller mode, communication-loss response and restart behaviour. Do not assume that selecting CANopen in a PLC automatically supplies a compatible motion setup.

For SE-20403R, the register table says current and microstep changes become effective after power cycling; several motion parameters become effective when the start command is inactive. Its hardware-selected setting is 9600 bit/s. The manual’s switch description and baud-register note conflict about the SW4 state for communications-selected baud rate, so confirm this on the delivered revision rather than embedding an assumed setting in a production program.

The R manual describes speed, periodic position and point-to-point position control; the C manual describes its own CANopen modes. Specify absolute versus relative commands, the scaling between command units and machine travel, acceleration/deceleration and the required update period. Reading driver status over a bus is not evidence of encoder-confirmed shaft position: the manufacturer places these units in its open-loop driver range.

Both manuals describe a debug mode entered with SW5 ON before power-up, in which changing SW5 can command 200 r/min test rotation. Record the normal operating switch state, firmware and saved parameters in the commissioning handover. A replacement should be checked in a controlled setup before connection to a load that could move unexpectedly.