STEP MOTOR DRIVE FEATURES
The GM215 can operate as a conventional STEP and DIRECTION input step motor drive.
MICROSTEPPING: The GM215 has a 10 microstep native resolution; each full step angle of the motor is divided into 10 equally spaced microsteps so a 200 step per revolution motor has 2000 stopping locations per revolution.
STEP PULSE MULTIPLIER: The GM215 synthesizes 10 microstep pulses for every full-step pulse and 5 microstep pulses for half-step pulse. The GM215 acts like a full or half-step drive but motor has the smoothness of a 10-microstep drive.
SUB-MICROSTEPPING: For the 10 microstep resolution, each input step pulse is divided into 32 sub-microsteps resulting in a motor smoothness equal to a 320 microstep drive.
MORPHING: The GM215 morphs from sine-cosine motor currents at low speeds to square-wave currents at high speeds. This technique extracts the maximum possible power from the motor at higher speeds. Morphing begins at 240RPM and ends at 360RPM.
MID-BAND RESONANCE COMPENSATION: The GM215 uses active second-order damping to completely suppress a step motor’s tendency to resonate and stall at medium speeds (300RPM – 900RPM). This results in stable motor operation in this region.
LOW SPEED RESONANCE COMPENSATION: Low speed resonances are motor vibrations at speeds below 120 RPM caused by motor non-linearity. The PROFILE and ADJUST trimpots settings nulls these vibrations.
PROTECTION: The GM215 is protected against motor to ground and motor to motor output short-circuits. It is also protected against reversed power supply polarity and power supply over-voltage. The internal fuse blows on polarity reversal and over-voltage.
AUTOMATIC STANDBY CURRENT: If enabled, the motor phase current is reduced to 70% of the set value and the GM215 motor switching topology is changed to a low heating recirculating mode. This happens 1 second after the last step pulse is received.
MOTION CONTROLLER FEATURES
The GM215 motion controller core is a 16-bit MCU, FPGA, Flash ROM and an RS485 interface transceiver. The motion controller executes ASCII format commands sent from an external PC or from its own non-volatile memory.
FTDI RS485 CABLE can be used to communicate with PC, to program on-board FLASH ROM, and to update latest G215 PIC24 microprocessor code.
'ON THE FLY' MOTION CONTROL: Acceleration, velocity and destination can be changed even while the motor is in motion. The new values apply immediately.
MULTIPLE AXIS MOTION: Up to 4 GM215 drives can communicate with each other to execute coordinated multi-axis motion.
RUN FROM STORED PROGRAM: The GM215 can run stored motion programs from its non-volatile Flash memory without a computer connected to it. The memory can store over 65,000 coordinates or program lines.
POWERFUL COMMAND-SET: The command-set includes 'if-then-else' conditional branching, looping and macros (subroutines). It also includes canned high-speed HOME routines, JOG routines, SPEED control routines and more.
INDEXING: The latest firmware update adds indexing, allowing the GM215 to be used for any application where continuous absolute moves are required.
DIGITAL OR ANALOG CONTROL: The GM215 can be controlled by PC program. User can set up acceleration, velocity, and distance by typing in proper number according to different applications.
The GM215 also has 3 on-board trimpots to allow setting acceleration, velocity and destination instead of using digital settings.
Analog value can even be changed during motor is running. These features can be used in applications such as real-time speed control and position adjust.
GENERAL PURPOSE I/O: The GM215 has three opto-isolated user defined inputs and three opto-isolated user defined outputs.
The general purpose I/O can be used as reset button, home limit switches, or emergency stop button.
RS-485 INTERFACE: The GM215 has RS485 interfaces available. There are two main purposes of using RS485: 1) communicate with host PC. 2) Communicate between drives. The default baud rate is 115,200.
BOOT-LOADER: The user can update the GM215 firmware using the built in boot-loader function. More powerful functions and modules will be added and posted on GECKO DRIVE website, user can download the latest code and flash the microprocessor using boot-loader.
