G320X MANUAL DC BRUSH SERVO MOTOR DRIVE
Thank you for purchasing the G320X drive. The G320X DC servo drive is warranted to be free of manufacturing defects for 3 years from the date of purchase. Any customer who is dissatisfied with it or is unable to make it work will be refunded the purchase price if the G320X is returned within 90 days of the purchase date.
DIP SWITCH SETTINGS The G320X has a 10 position DIP switch that is accessible through the cutout in the drive’s cover. These switch settings control many of the features of the G320X and are labeled SW1 through SW10.
TERMINAL 7 Encoder +5VDC Connect the encoder +5VDC to this terminal TERMINAL 8 Channel A Connect the encoder channel “A” to this terminal TERMINAL 9 Channel B Connect the encoder channel “B” to this terminal To determine the optimal encoder line count, please follow the instructions below. 1.) Determine the motor’s no load RPM 2.) Calculate rated RPM as 80% of no load RPM 3.) Divide (#2) by 60 to get revolutions per second 4.) Determine the CNC program’s maximum step pulse frequency (in Hz) 5.
STEP 4: CONNECTING CONTROL INPUTS The STEP and DIRECTION signal drivers must be 3.3V or 5V TTL signals and have edge transition times of 100 ns or faster. The COMMON input can be connected to signal ground or a +5VDC supply. The G320X default motor direction is CW when the DIRECTION pin is left unconnected. TERMINAL 10 TERMINAL 11 TERMINAL 12 Direction Connect the DIRECTION line to this terminal. Step Connect the STEP line to this terminal. Common Connect this terminal to the signal ground or +5VDC.
REMOVING THE COVER: 1.) Remove the two 2-56 Phillips-head screws on the bottom of the drive. 2.) Slide the cover backwards while lifting until it clears the drive. REPLACING THE COVER: 1.) Slide the cover forward over the drive until the holes in the cover line up with the holes in the bottom plate. 2.) Replace the screws on the bottom of the drive. When the motor is critically damped you should see a graph very similar to the “Critically Damped” portion of the chart below.
The higher “P” is set, the noisier the motor will be when stopped. This is because higher gain causes more vigorous dithering between encoder counts at rest. There is a trade-off between high gain (high stiffness) on one hand and excessive dithering (noise and motor heating) on the other. The “I” setting takes out the remaining following error. Increasing the “I” setting will increase the servo stiffness; if it is increased too much the servo will oscillate.
The Warn indicator (yellow LED) is lit whenever the motor is more than 128 counts off of the commanded position. Its purpose is to give warning that a large following error is probably developing and will result in the drive going into FAULT (red LED) if measures are not taken to arrest the increasing following error. The Power indicator (green LED) is lit whenever there is power applied to the G320X. ERROR / RESET PIN This terminal functions as an ERROR output and as a RESET input.
G320X SPECIFICATIONS Power Supply: +18VDC to +80VDC Quiescent Current: 30mA Motor Current: 0 to 20 Amps Motor Inductance: At least 1mH Short Circuit Protect: 22A trip Lock Range: +/- 256, 512, 1024, or 2048 Feedback: Quadrature TTL Encoder 5V Compatible Feedback Resolution: X4 Encoder Line Count Feedback Voltages: <1V for Logic 0 and >4V for Logic 1 Switching Frequency: 20kHz Current Limit: 0 to 20 Amps Trimpot Adjustable Analog PID: Proportional, Derivative, Integral Coefficient Trimpots Step Pulse Frequen
