G250X

G250X STEP MOTOR DRIVE REV 2: July 14, 2010 Thank you for purchasing the G250X drive. The G250X 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 G250X is returned within 15 days of the purchase date and is in like-new condition. PLEASE READ FIRST BEFORE USING THE G250X Before beginning, be sure to have a suitable step motor, a DC power supply suitable for the motor and a current set resistor. The motors 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. G250X PIN WIRING The G250X uses a 30 pin male or female header. It is required to have a suitable breakout board with a mating connector and is not recommended to be used without one as the drive is not optically isolated. PINS 1-4 Power Ground Connect the negative (black) lead of your power supply to these pins. PINS 5-8 Power (+) Connect the positive (red) lead of your power supply to these pins. It must be between +15VDC to +50VDC. PINS 9-12 Motor Phase A Connect one end of your Phase A motor winding here. PINS 13-16 Motor Phase /A Connect the other end of your Phase A motor winding here. PINS 17-20 Motor Phase B Connect one end of your Phase B motor winding here. PINS 21-24 Motor Phase /B Connect the other end of your Phase B motor winding here. PIN 25 Current Set Connect one end of your current set resistor to this pin with the other end going to pin 30. PIN 26 Reserved Do not use. PIN 27 Direction Connect the DIRECTION signal to this pin. PIN 28 Step Connect the STEP signal to this pin. PIN 29 Disable This pin will force the winding currents to zero when shorted to ground (PIN 30). PIN 30 Common Connect this to your logic (controller) ground as well as your current set resistor. POWER SUPPLY CONNECTION PINS 1-4 Power Ground Connect the power supply ground to these pins PINS 5-8 Power (+) Connect the power supply + to these pins The power supply voltage must be between 15VDC and 50VDC. The maximum power supply current required is 67% of the motors 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. 1 G250X STEP MOTOR DRIVE REV 2: July 14, 2010 CAUTION Power supply voltage in excess of 50VDC will damage the G250X. 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 motors 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 * (2) = 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 PIN 25 Current Set Connect the current set resistor to this pin. PIN 30 Common Connect the other end of the current set resistor to this pin. This input programs the G250Xs 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 PIN 25 and PIN 30. If your motor is 3.5A or above you can leave these PINs 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 PINS 9-12 Phase A Connect one motor winding to these pins PINS 13-16 Phase /A Connect the other end of the winding to these pins PINS 17-20 Phase B Connect the other motor winding to these pins PINS 21-24 Phase /B Connect the other end of the winding to these pins Connect one motor winding to PINS 9-12 and PINS 13-16. Connect the other winding to PINS 17-20 and PINS 21-24. 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 PINS 9-12 and PINS 13-16. CAUTION Do not short the motor leads to each other or to ground damage will result to the G250X. 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 motors 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 PIN 27 Direction Connect the DIRECTION line to this pin. PIN 28 Step Connect the STEP line to this pin. 2