HPC LS3020 connections - July 2012¶

• Table of contents
• HPC LS3020 connections - July 2012
  • Wiring diagram
  • Laser ON cable
  • Disabled laser PWM
  • Enabled laser PWM
  • Y stepper cable
  • Flatcable for X stepper and endstops
  • Stepper driver orientation

Wiring diagram¶

Here is a schematic diagram of how everything should be wired up (see LaOS wiring edited):

Laser ON cable¶

The laser-on cable, as it comes shipped with the laser cutter needs to have one wire switched over, from this:

... to this:

It then plugs into the mainboard like this:

Disabled laser PWM¶

To get started fast, just run the laser without PWM support - you can accomplish the same by manually turning the front-panel potmeter back to reduce the power.

With the July 12 power supply, you're done. To disable PWM on the older power supply, make sure the D+ and D- pins are jumpered on the power supply:

Enabled laser PWM¶

To use the power control from the LAOS board, you need to connect the laser PWM output to the ANALOG input of your power supply. You need to make a two wire cable with a 3 pin JST on one side, and a 4 pin JST on the other side.

• Use a 470 ohm pull-up resistor between +5V and analog in at the laser power supply side.
• "C" connects to the analog in pin (and resistor)
• "E" connects to GND

Y stepper cable¶

The Y stepper cable (with a 4-pin JST connector on the end) may be too short to reach the proper socket on the LAOS mainboard v0.3 - this can be solved by manually splicing some extra wires, to extend it by about 15 cm:

Color	Signal	Connect to
RED	XA+	J18.2 A
BLUE	XA-	J18.3 A
YELLOW	XB+	J18.4 B
WHITE	XB-	J18.5 B

Flatcable for X stepper and endstops¶

Pin	Signal	Connect to
PIN12	XA-	J24.1 A
PIN11	XA+	J24.2 A
PIN10	XB-	J34.3 B
PIN9	XB+	J34.4 B
PIN6	COMMON	J34.4 GND
PIN5	XHOME	J34.2 XHOME
PIN4	YHOME	J34.3 YHOME
PIN3	+5V	J34.1 Vsensor

Stepper driver orientation¶

Be very careful how you place the stepper drivers on the mainboard. Mistakes can blow up both the stepper driver and the mbed controller!

Here is the proper orientation for the purple "StepStick" drivers, with heatsinks mounted on top of the A3984 driver IC's: