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Contents
1. 1 675 DIRECTION 42 55MM STEP DISABLE SIGNAL GND 1 000 25 40 0 125 DIA 3 17MM ryr oVenaouwruan Ocoto cO CURRENT SET RESISTOR CONNECT 4W RESISTOR FROM SET TERM 5 TO I SET TERM 4 MOTOR PHASE CURRENT AMP PER 1 000 OHMS mm 1 560 SPECIFICATIONS J soe SUPPLY VOLTAGE I5VDC MIN 50VDC MAX 0 120 5 05 PHASE CURRENT TO 3 54 POWER DISSIPATION 3 5W 3 54 AND 50VDC RESOLUTION 10 MICROSTEPS PER FULL STEP INPUT LEVEL OV TO 3 3V MIN OV TO 5V MAX 0 585 INPUT CURRENT IMA 14 86MM WEIGHT 0 45 OZ 12 5 GRAMS TEMPERATURE 0 756 STEP PULSE 0Hz 300kKHz STEP PULSE WIDTH MICROSECOND MIN AUTO STANDBY 70 OF SET CURRENT 55 002. GECKODRIVE INC GECKODRIVE G251 STEP MOTOR DRIVE 14662 FRANKLIN AVE SUITE MOTOR CONTROLS REV 9 November 16 2009 TUSTIN CA 92780 714 832 8874 Thank you for purchasing the G251 drive The G251 microstep drive is warranted to be free of manufacturing defects for 1 year from the date of purchase Anyone who is dissatisfied with it or is unable to make it work will be cheerfully refunded the purchase price if the G251 is returned within 15 days of the purchase date and is in like new condition PLEASE READ FIRST BEFORE USING THE G251 Before beginning be sure to have a suitable step motor a DC power supply suitable for the motor and a current set resistor The motor s rated phase current must be between 0 amps and 3 5 amps and the current set resistor may be a 1 4 watt 5 part Finally have a STEP and DIRECTION pulse source available G251 TERMINAL WIRING The G251 uses a 12 position 3 5mm terminal block The wire gauge must be between 16 and 26 AWG and the wire must be stranded Do not solder tin the wire strands as this will cause it to fatigue over time and it will eventually break Do not exceed 30 in oz 0 2 Nm torque the terminal screws TERMINAL 1 Power Ground Connect the negative black lead of your power supply to this terminal TERMINAL 2 Power Connect the positive red lead of your power supply to this terminal It must be between 15VDC to 50VDC TERMINAL 3 Current Set Connect one end of your cu
3. e A Connect the other end of the winding to this terminal TERMINAL 7 Phase B Connect the other motor winding to this terminal TERMINAL 8 Phase B Connect the other end of the winding to this terminal Connect one motor winding to terminals 5 and 6 Connect the other winding to terminals 7 and 8 Turn the power supply off when connecting or disconnecting the motor If the motor turns in the wrong direction reverse the motor winding connections to terminals 5 and 6 CAUTION Do not short the motor leads to each other or to ground damage will result to the G251 4 wire 6 wire and 8 wire motors may be used When 6 wire motors are used they may be connected in half winding or full winding This is equivalent to an 8 wire motor connected in parallel or series If a motor is connected in series or full winding the motor s phase current rating is half of its parallel or unipolar rating The choice depends on the high speed performance required a parallel connected motor will provide twice the power of a series connected motor at the same power supply voltage STEP AND DIRECTION INPUTS TERMINAL 9 Direction Connect the DIRECTION line to this terminal GECKODRIVE INC GECKODRIVE G251 STEP MOTOR DRIVE 14662 FRANKLIN AVE MOTOR CONTROLS REV 9 November 16 2009 Sauce 714 832 8874 TERMINAL 10 Step Connect the STEP line to this terminal These terminals can be driven with 3 3V or 5V logic If 3 3V logic is used then the input c
4. rrent set resistor to this terminal TERMINAL 4 Current Set Connect the other end of your current set resistor to this terminal TERMINAL 5 Motor Phase A Connect one end of your Phase motor winding here TERMINAL 6 Motor Phase A Connect the other end of your Phase motor winding here TERMINAL 7 Motor Phase B Connect one end of your Phase B motor winding here TERMINAL 8 Motor Phase B Connect the other end of your Phase motor winding here TERMINAL 9 Direction Connect the DIRECTION signal to this terminal TERMINAL 10 Step Connect the STEP signal to this terminal TERMINAL 11 Disable This terminal will force the winding currents to zero when shorted to ground TERMINAL 12 TERMINAL 12 Common Connect this to your logic controller ground POWER SUPPLY CONNECTION TERMINAL 1 Power Ground Connect the power supply ground to this terminal TERMINAL 2 Power Connect the power supply to this terminal GECKODRIVE INC GECKODRIVE G251 STEP MOTOR DRIVE 14662 FRANKLIN AVE SUITE MOTOR CONTROLS REV 9 November 16 2009 TUSTIN CA 92780 714 832 8874 The power supply voltage must be between 15VDC and 50VDC The maximum power supply current required is 67 of the motor s rated phase current An unregulated power supply may be used as long as the voltage stays between the limits keep the ripple voltage to 10 or less for best results CAUTION Power supply voltage in e
5. s trimpot adjusts the motor for the smoothest possible low speed operation Set the motor speed to about 1 4 revolution per second and then turn the trimpot until a distinct null is noted in the motor s vibration This will result in the most even microstep placement for a given motor and power supply voltage DISCLAIMER CERTAIN APPLICATIONS USING POWER PRODUCTS MAY INVOLVE POTENTIAL RISKS OF DEATH PERSONAL INJURY OR SEVERE DAMAGE TO PROPERTY GECKODRIVE INC PRODUCTS ARE NOT DESIGNED AUTHORIZED OR WARRANTED TO BE SUITABLE FOR USE IN LIFE SUPPORT DEVICES OR OTHER CRITICAL APPLICATIONS INCLUSION OF GECKODRIVE INC PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO BE FULLY AT THE PURCHASER S OWN RISK In order to minimize risks associated with the purchaser s application adequate design and operating safeguards must be provided by the purchaser to minimize inherent or procedural hazards GECKODRIVE INC assumes no liability for applications assistance or the purchaser s product design GECKODRIVE INC does not warrant or represent that any license either express or implied is granted under any patent right copyright or other intellectual property right of GECKODRIVE INC GECKODRIVE INC GECKODRIVE G251 STEP MOTOR DRIVE 14662 FRANKLIN AVE MOTOR CONTROLS REV 9 November 16 2009 TUSTIN 92760 714 832 8874 GECKODRIVE 6251 MAIN CONNECTOR GND VDC
6. urrent is 1mA for logic 0 and zero for logic 1 If 5V logic is used then the input current is 1mA for 0 logic and 0 67mA for logic 1 DISABLE PIN TERMINAL 11 Disable This terminal will force the winding currents to zero when shorted to ground TERMINAL 12 Shorting this input to ground terminals 11 to 12 forces winding currents to zero and stops all output switching activity The G251 will continue totalizing step and direction inputs if any are sent The power supply current drops to less than 15mA The motor will return to its original position when the disable input is released if no step pulses have been sent and the motor has not been moved more than 2 full steps COMMON PIN TERMINAL 12 Common Connect this terminal to the controller signal ground HEATSINKING The G251 needs heatsinking for current settings greater than 3 amps The case temperature measured on the bottom plate should not exceed 70 degrees C and for best life should be kept to 50 degrees C or less Use heatsink compound between the G251 and the heatsink CAUTION Current settings above 3 Amps without a heatsink will result in damage to the G251 The drive must be heatsinked to a piece of aluminum preferably with fins and a fan to increase heat dissipation and surface area Do not screw the drive directly to the door of your control cabinet as this will typically not provide adequate heatsinking properties ADJUSTING THE TRIMPOT Thi
7. xcess of 50VDC will damage the G251 CAUTION Never put a switch on the DC side of the power supply This will damage if not destroy your drive A very accurate calculation of power supply voltage is to find your motor s inductance and put it into the following equation 32 mH inductance Power Supply Voltage If your motor has 2mH of inductance the equation would look as follows 32 V2 45 12V In the example above 45 12V is the maximum voltage for that specific motor any voltage above this will create unnecessary heating and any voltage below that will get you proportionally less speed than you could otherwise get at 45 12V CURRENT SET RESISTOR TERMINAL 3 Current Set Connect the current set resistor to this terminal TERMINAL 4 Current Set Connect the other end of the current set resistor to this terminal This input programs the G251 s current output to the motor windings The current set resistor is a linear calculation of 1K ohms of resistance for every amp of motor winding current This means that a 2 3A per phase motor will require a 2 3K ohm resistor on terminals and 4 If your motor is 3 5A or above you can leave these terminals open and the drive will self limit to 3 5A however you will lose the auto current reduction feature of the drive If you require this feature then a 3 5K resistor should be put on the drive MOTOR CONNECTION TERMINAL 5 Phase A Connect one motor winding to this terminal TERMINAL 6 Phas
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