DC BRUSH MOTORCONTROLLER BMSD
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DC BRUSH MOTORCONTROLLER BMSD with RS-485 interface Manual BMSD.002 1. Product designation Brush motor controller BMSD is an electronic device to operate and control DC brush motors with or without a encoder. Motor operation parameters are set either by commands via communication interface RS-485 or via controller’s inputs. Controller is designed to control speed, direction, smooth start and stop of DC brush motors (up to 12A). 2. Technical characteristic Power supply voltage, VDC Max. operation motor curren, A Current protection, A Max. motor voltage Min. nonzero voltage Min. acceleration and deceleration setting, V/sec Max. acceleration and deceleration setting, V/sec External speed adjusting – voltage signal, V External speed adjusting – external potentiometer resistance, kOhm Encoder power supply output, VDC Max. current of encoder sensor, mА Output of encoder sensor Min. value of high-level signal from encoder, V Max. value of low-level signal from encoder, V Min. value of pulse duration of encoder sensor, ms Max. motor stabilized speed, RPM Input signals “DIRECTION” and “START/STOP” parameters - max. resistance, kОm - max. current:, А - signal – clean contact Overall dimensions, mm Environmental Conditions: Ambient Temperature: -25…+50°C Humidity: 90% RH or less upon condition +25°C Condensation and freezing: none Pressure: 650…800 mm of mercury 3. Construction and control elements BMSD is designed as a circuit plate with electronics elements, installed on a plate and covered with a metal case. Besides electronic components, there are indicating and control elements, connection terminals and connectors on the board: • • • • • terminal screws for power supply, brush motor windings and encoder lines, and control circuit connection; “START/STOP” button; Internal preset potentiometers to adjust speed “SPEED”, acceleration “ACCEL” and deceleration “BRAKE”; RS-485 terminals “PE”, “A” and “B”; LED for indication of the controller status. Control inputs: To adjust motor speed internal potentiometer “SPEED” and analog input “(0..5)V” are provided. To adjust acceleration and deceleration internal potentiometers “ACCEL” and “BRAKE” are provided. To change the direction input “REVERSE” is intended. To start or stop motion button and input “START/STOP” are intended. 4. Assembly and connection Please, learn this manual carefully before connection and assembly. Please, wire just when power is off. Do not attempt to change wiring while the power is ON. Please, provide a reliable contact in connection terminals. During wiring, please, observe the polarity and wire management.

Img. 2 – connection example 1. Connect brush motor to the controller according to the scheme – image 2. Motor phases should be connected to the contacts marked . Signal wire of hall encoder lines should be connected to the contact “HALL”. GND of Hall encoder connects to the contact “GND”, supply voltage for Hall encoder connects to the contact “+5V”. If there is multichannel encoder, use only single channel. 2. Connect power supply to the contacts U+ and U- according to the specification of the power supply unit. - is the electric ground. Input voltage range 10-28VDC is allowed. Connection...

5. Operation Controller BMSD can operate as a standalone unit or be controlled via RS-485 communication interface. Controller modes are performed in the table 2 below. 5.1. Operation modes • As power is on; • As button “START/STOP” pressed or input activated (from modes 2-6); • By command via RS-485 (from modes 2-6). LED indication • Green non-flashing LED light - for all communication address except 0xFF. • Green LED of the controller with 0xFF communication address doesn’t lit LED flashing: 0.2s on – 0.2s off Setting Command via RS-485 2 communicatio (from mode 1) n address Press a button...

The motor voltage is 0,05* Vsup (5% of supply voltage) at the minimum speed. The motor can completely stop at the minimum speed if the motor model doesn’t accept the voltage. The motor voltage is 0,98* Vsup (98% of supply voltage) at the maximum speed. 4. The motor acceleration depends on the “ACCEL” potentiometer position. The maximum acceleration (minimum acceleration time) corresponds to the end left position - (3Vsup) V/sec. The minimum acceleration (maximum acceleration time) corresponds to the end right position - (3Vsup/8) V/sec. 5. The motor deceleration depends on the “BRAKE”...

Status scan Start motion Stop motion, go to standby mode Don’t send this byte for 0x50 command Any Status + Counter most significant 4 bits (image 7) Counter least Actual speed significant 8 bits 6.3. CRC – check sum control calculation. The final byte of every command and reply frame is CRC. The CRC calculation algorithm is follow: unsigned char OWI_ComputeCRC8(unsigned char inData, unsigned char seed) { unsigned char bitsLeft; unsigned char temp; for (bitsLeft = 8; bitsLeft > 0; bitsLeft--) { temp = ((seed ^ inData) & 0x01); if (temp == 0) { seed >>= 1; } else { seed ^= 0x18; seed >>= 1;...