Stepper Specifications

Rhonmac-cnc

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RMB3DB Stepper Motor Micro Stepping Driver Data Sheet

Main Features

High performance, low cost
Supply voltage up to +32VDC, peak current up to 2.5A
3-state current control technology
Automatic idle-current reduction
Suitable for 2-phase and 4-phase stepping motors
Optically isolated input signals
Pulse frequency up to 100 KHz
4 Selectable resolutions
DIP switch current setting and micro-stepping settings. See tables below
PUL/DIR mode and CW/CCW mode.
Small size (86x55x20.5mm)
No User Serviceable Parts Inside

Introduction

RMB3DB is a high performance micro-stepping driver based on one of the most advanced technologies in the world today. It is suitable for driving any 2-phase and 4-phase hybrid stepping motors. By using advanced bipolar constant-current chopping technique, it can output more speed and power from the same motor, compared with traditional technologies such as L/R drivers. Its 3-state current control technology allows coil currents to be well controlled, with relatively small current ripple and therefore less motor heating.

Applications

Suitable for a wide range of stepping motors of Nema 17 and 23, and usable for various kinds of machines, such as X-Y tables, cnc router machines, table top and bench milling machine cnc conversion, lathe cnc conversion, labeling machines, laser cutters, engraving machines, robots and pick-place devices. Extremely suitable for applications which will demand high speed, reliability and high precision

Electrical Specifications

Parameters	RMB3DB
Parameters	Min.	Typical	Max.	Unit
Output current	0.39	-	2.5	Amps
Supply voltage (DC)	12	24	32	VDC
Logic signal current	7	10	16	mA
Pulse input frequency	0	-	100	Khz
Isolation resistance	500	-	-	MΩ

Mechanical Properties

Pin Assignment and Description

Control Signal Connector P1 pins

Pin Function	Details
PUL	Pulse signal: in single pulse (PUL/DIR) mode, this input represents pulse signal, effective for each upward-rising edge; in double pulse mode (CW/CCW) this input represents clockwise (CW) pulse. For reliable response, pulse width should be longer than 3μs.
DIR	DIR signal: in PUL/DIR mode, this signal has low/high voltage levels, representing two directions of motor rotation; in CW/CCW mode (set by inside jumper J2), this signal is counter-clock (CCW) pulse, effective on each rising edge. For reliable response, direction signal should be sent to driver 5μs before the first pulse of a motion direction reversal.
OPTO	Photo-coupler driving power supply.
ENA	Enable signal: this signal is used for enabling/disabling the driver. High level for enabling the driver and low level for disabling the driver. Usually left unconnected (enabled).

Power connector P2 pins

Pin Function	Details
Ground	DC power ground
+V	DC power supply, +20VDC － +32VDC, Including voltage fluctuation and EMF voltage.
Phase A	Motor coil A (leads A+ and A-)
Phase B	Motor coil B (leads B+ and B-)

Micro-step Resolution Selection

Micro-step resolution is specified by 5, 6, DIP switches as shown in the following table:

Micro-step	steps/rev.( 1.8°/rev)	SW5	SW6
1	200	ON	ON
2	400	OFF	ON
4	800	ON	OFF
8	1600	OFF	OFF

Current Setting

Peak Current (A)	SW1	SW2	SW3
0.39	OFF	ON	ON
0.71	ON	OFF	ON
1.10	OFF	OFF	ON
1.42	ON	ON	OFF
1.81	OFF	ON	OFF
2.13	ON	OFF	OFF
2.52	OFF	OFF	OFF

Typical Connections

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Please note that the RMB3DB driver requires a +5Vdc supply and ground to the opto-isolator circuit. We supply a Voltage regulator that will fit into your Power supply to provide this voltage

RMB4DB Stepper Motor Driver Data Sheet

Data Sheet available shortly.

Our policy is one of continual improvement therefore specifications may change without notice. Pictorial representations are intended as a guide only and may vary depending on machine model or product offered.