G540 4-AXIS Drive User Manual Rev I
Thank you for choosing to purchase the G540 4-Axis Drive system. If you are dissatisfied with it for any reason at all within two weeks of its purchase date, you may return it for a full refund provided it is cosmetically unmarred and undamaged electrically in any way. Otherwise Geckodrive Inc. fully warranties it against workmanship defects for 1 year after its purchase date.
The G540 is very easy to use. All it requires is:
1) MOTORS: One to four step motors are required. All NEMA-17, many NEMA-23 and a few NEMA-34 motors are acceptable. The motors preferably should be square in cross-section, not round. The motors can be 4, 6 or 8-wire motors. 5-wire motors cannot be used with the G540. Choose a motor that has a rated current of 3.5A or less. Choose a motor that has a rated winding inductance of 2.5mH to 3mH if maximum power output (>100W mechanical) is a requirement. Never use a power supply voltage greater than 32 times the square-root of the motor inductance expressed in milli-Henries (mH).
2) MOTOR CABLES: The motors connect to the G540 via male DB9 connectors. The four motor wires connect to pins 6 and 7 for one motor winding, pins 8 and 9 for the other motor winding. The current set resistor connects to pins 1 and 5. The motor cable should be a 4-conductor cable and it can be shielded or unshielded. If a shielded cable is used, connect the shield to either pin 2, 3 or 4. Pins 2, 3 and 4 connect to ground inside the G540.
3) CURRENT SET RESISTORS: The current set resistor programs the axis drive current (0 to 3.5A) to match the rated phase current of the motor being used with the axis. Each axis requires a current set resistor. The resistor can be from 1/10 W to 1/2 W in size and 1% to 5% tolerance. The current set equals 1,000 Ohms per Amp of motor current. Example: A 3.3A per phase motor requires a 3.3K resistor, a 1.5A per phase motor requires a 1.5K resistor.
4) POWER SUPPLY: Connect a DC power supply to the MAIN TERMINAL BLOCK, the positive supply wire to Pos 11 and the negative (ground return) wire to Pos 12. The power supply voltage must be between +18VDC and +50VDC. The power supply voltage determines how fast your motors can go. Supply voltage has no effect on the motor’s low-speed torque. The power supply can be regulated or unregulated. The power supply current will depend on the number of motors used and the motors rated phase currents. The power supply current also depends on motor speed and applied load. A rule of thumb estimate is add up all the motor phase currents and multiply the result by 0.6 to get the required power supply current.
5) PARALLEL PORT CABLE: Use a parallel port cable to connect the G540 to the PC. The G540 end of the cable must be a male DB25 connector.
Get pdf G540 4-AXIS Drive User Manual Rev I
