3
#L010128
June 2002
Introduction
The MBC25P11 is an economical single axis step motor driver integrated with a programmable pulse
generator. The MBC25P11 microstep driver/pulse generator has an output current capability of 0.5A
minimum to 2.5A maximum (peak rating). The MBC25P11 driver operates with a DC voltage of 12VDC to
35VDC. The MBC25P11’s internal PG (pulse generator) has four different programmable motion profiles.
The MBC25P11 also has directional soft and hard limit switch inputs, a busy output and a clock output
that can be used for daisy chaining drivers together. The MBC25P11 driver features direction control and
motor current On/Off capabilities. The “Reduce Current Enabled” feature automatically reduces motor
current to 70% of the set value. The driver has built in features to indicate power on (green LED), running
(yellow LED) and error conditions (red LED). The MBC25P11 has various step resolutions that can be
implemented. These divisions range from 200 steps/rev to 1600 steps/rev. The bipolar drive configuration
handles 4, 6, and 8 lead step motors and is also equipped with short circuit, over temperature and crossover
current protection. The MBC25P11 communicates via RS232 communication. The easy to use Windows
software, SMPG10WIN, is used to directly set up to four different motion profiles.
Features
• Output Current of 2.5A Peak
• 200 to 1600 Steps/Revolution (1, 2, 4 and 8 Selectable Step Operation)
• Drives Two Motors In Series
• On-Board Programmable Pulse Generator
• Pulses From 77Hz to 15kHz
• Directional Soft and Hard Limit Switch Inputs
• Clock Output for Daisy Chaining
• Busy Output
• Motor On/Off Input and Automatic Current Reduction
• Short Circuit Protection
Motion Profiles and Running the Pulse Generator
The programmable pulse generator has the ability to store up to four different motion profiles. The profiles
include a base speed (starting speed), a maximum speeds (running speed) and acceleration/deceleration.
The base speed has a range of 77-3500 Hz, the maximum speed has a range of 77 Hz-15 kHz, and the
acceleration/deceleration has a range of 1-255. A seperate command is used to control the ramp down
profile. The ramp down profile lets the user have the option to either ramp down to base speed and stop
(soft stop), or to hard stop once the Run input is released. The deceleration option is the same for all four
motion profiles.
There are “two ways” to get the pulse generator to run. The first way is to directly control it from the
computer with software. Once the motion profiles have been set, the pulse generator is ready to run.
From the software, the user can select which profile to run and then hit the run button. There are then
several different ways to stop motion. To ramp down to base speed and continue to run at base speed,
a soft limit command needs to be sent. This is done by either hitting the soft limit button or a physical
limit switch trigger of the soft+ or soft- depending on direction. To stop all motion, a hard limit command
needs to be sent. This is done by either hitting the hard limit button or a physical limit switch trigger of the
hard+ or hard- depending on direction. The second way to make the pulse generator run is to activate the
Run input. When this input is activated, it looks to see what speed profile input is set. If no speed profile
is set then the default is Profile 1. To stop motion, release the Run input. When this input is released, the
deceleration option will then either ramp down to base speed and stop or just hard stop. If a soft+ or soft
limit switch is activated when the Run input is active, the pulse generator will ramp down to base speed
and keep running. If a hard+ or hard- limit switch is activated when the Run input is active, the motor will
stop immediatley.
July 2018
