These are the inputs to control the lps. The 5V output is not used in most places because of it’s low current limit, usually around 20mA.
Ground is common for all signals.
The IN signal controls the maximum current limiting of the lps. It accepts an analog dc voltage or a pwm, both are TTL (0 to 5V) signal levels.
Laser enable, when active allows the machine to lase. L goes low for laser enable, however the H input can be used as an inverted input for L.
Water protect needs to be low for the lps to lase… On my machine this is wired to ground and the controller senses coolant flow, if this fails, it will stop it’s operation.
The drawback to using P for coolant or door protection, is that the actual controller doesn’t know the lps is disabled and makes it’s difficult, if not impossible, to restart the machine after a simple coolant fault or a door being opened.
A dsp, like my Ruida and most commercial machines produce a pwm continuously while a layer is executing… When it needs to lase, laser enable goes active allowing the lase operation at the current limit value. Simply, there are two control signals, one for current limiting and one to allow it to lase.
| Signal |
LPS |
| Current Limit |
IN |
| Laser Enable |
L |
| Laser Enable |
H |
| Water Protect |
P |
| Signal Ground |
G |
| DC voltage |
5V |
The problem is the DLC32 doesn’t have two signals, only one. This is because these are really built for digital devices such as an LED laser module, but the tube is actually an analog device.
The K40’s setup is setting the lasers maximum current, manually, from the front console control. They then use the PWM to toggle the tube on and off.
Monport has changed the the pwm with it routed to IN, so it’s actually controlling the tube the best it can by an analog control… However, I’ve seen some poor engineering changes that Monport has applied along with failure to actually test the machine after the engineering change and ship it to a customer not working.
So how you wire it is up to you… I’d suggest using L or P as a laser enable switch… Usually machines of this size will have a separate power switch for the lps mains. Using the pwn to feed and control the IN pin for software current control
Stepper motor drivers are usually newer if they have higher numbers… but I’ll included links to a pdf for each. You can simply read the engineering advances in one over the other…
DM542 pdf
DM556 pdf
Hope this helps – good luck
. But dont think it will make any difference.
… lol
is the ground symbol. Standard home wiring comes in with two 120V lines, requiring a neutral or ground return to get the 120V… If you switch them you could be applying full mains voltage to the chassis of the device, making it a high electrocution risk.
