This section describes common problems encountered by users and how to find out what the malfunction is caused by. In case you have an issue with your adapter, there is a good chance you will quickly find a solution to your problem by going through the list below. Find the case that matches your situation and follow the tips.


NOTE: Some of the tests below require voltage measurements. A cheap multimeter may be used to this end. You need to set the DC voltage range to 30 V or higher.



An oscilloscope may be used as well.

--------------------------------------------------------------------------------------------------------------------------------------

  1. The POWER LED is off, although the power supply seems to be operational, ie.:

- the power supply unit (PSU) is working;

- the power supply unit is properly attached to the PLH3D-CNC Adapter;

- the key switch is turned on.


ADVICE:

Check the presence of the internal power supply at the EXTENSIONS connector with a multimeter. After turning the PLH3D-CNC Adapter’s power supply on, carefully touch the EXTENSIONS connector pin 1 with the multimeter’s (+) probe, and pin 6 with the (-) probe. Refer to the pinout shown in the Dimensions and Pinout section of the Manual.



 

In case you do not use „external switches” and there are wire jumpers in the EXT SWITCH connector, you can connect the multimeter’s (+) probe to one of the jumpers:




The multimeter should give a reading between 15 V and 24 V. This depends on the type of the PSU used.

  • If there is no voltage or the voltage is too low (below 12 V), it means there is something wrong with either the PSU or the PLH3D-CNC Adapter’s power supply connector. If you use the PSU from Opt Lasers engraving lasers kits, the multimeter should indicate a voltage above 18 V.
  • If there is a correct voltage, then the electronics of the PLH3D-CNC Adapter must be out of order.

--------------------------------------------------------------------------------------------------------------------------------------

  1. The POWER LED is lit, but there is no laser beam, even though it seems there are proper controlling and enabling signals at the inputs of the PLH3D-CNC Adapter. The LASER LED is not lit.

ADVICE:

  • The laser head may be not armed. Make sure you armed the laser head by pressing the MODE BUTTON in the PLH3D-CNC Adapter. Check whether the ARMED LED is lit continuously (not flashing).

---------------------------------------------------------------------------------------------------------------------------------

  1. The POWER LED is lit, but no arming takes place when pressing the MODE BUTTON. The ARMED LED is neither lit nor flashing.

ADVICE:

  • the electronics of the PLH3D-CNC Adapter is apparently out of order.

--------------------------------------------------------------------------------------------------------------------------------------

  1. The POWER LED is lit. After pressing the MODE BUTTON, the ARMED LED does not light up and, after a couple of seconds, it starts to flash. The built-in fan does not run, which suggests a lack of power supply at the laser head. 

ADVICE:

One (or both) of the contact pairs for external switches (EXT SWITCH) may be open. As a result, no power supply gets transferred to the laser head.


You need to check whether the power supply voltage of 15-24 V (depending on the type of the PSU) appears at the LASER HEAD connector. Contact the multimeter’s (+) probe to pin 5 of the LASER HEAD connector and the (-) probe to pin 4 of the CONTROL connector. Refer to the pinout shown in the Dimensions and Pinout section of the Manual.



  • Make sure a screw terminal plug is plugged into the EXT SWITCH connector.
  • If no external switch is used, make sure each pair of the plug contacts (1-2 and 3-4) is shorted by a wire jumper:



  • If you use an external switch, verify that it is properly closed.
  • If you suspect that the external switch does not close, replace it by a wire jumper at the terminal plug and retry to arm the PLH3D-CNC Adapter.
  • If the contacts are properly closed but the issue still persists, then the electronics of the PLH3D-CNC Adapter must be out of order.


ADVICE 2:

  • The same event occurs if the laser head is taken off from the docking station and there is no connection between the laser head and the adapter. Put the laser head on the docking station before arming the laser.
  • Another variation of this problem occurs when the connections from the Adapter through the docking station are not stable. Make sure each wire is screwed tight on the connectors. Ensure each wire has a corresponding end on the laser head connector and the Adapter connector.

--------------------------------------------------------------------------------------------------------------------------------------

  1. The POWER LED is lit. After pressing the MODE BUTTON, the ARMED LED is lit continuously, but there is no supply at the laser head (the built-in fan does not run).

ADVICE:

Step 1: Check the cable between the PLH3D-CNC Adapter and the laser head. Carefully inspect the cable’s pinout. If you are using a Docking Station, please consult relevant documentation as well.





Step 2: Next, check the laser head’s power supply at the LASER HEAD connector of the PLH3D-CNC Adapter:




  • If there is no voltage or the voltage is too low (below 12 V), then the electronics of the PLH3D-CNC Adapter must be malfunctioning. If you use the PSU from Opt Lasers engraving lasers kits, the multimeter should indicate a voltage above 18 V.


Step 3: If it is possible, check the power supply at the laser head:




  • If there is no voltage or the voltage is too low (below 12 V) then the cable must be malfunctioning. The PSU purchased as a part of Opt Lasers engraving lasers kits should show a voltage in excess of 18 V.
  • If no malfunction has been found throughout these steps, then it means that the laser head itself must be malfunctioning. 

--------------------------------------------------------------------------------------------------------------------------------------

  1. The POWER LED is lit. After pressing the MODE BUTTON, the ARMED LED is lit continuously for a while but after a couple of seconds the ARMED LED starts to flash.

ADVICE:

  1. It is possible that no supply current is flowing through the laser diode (even though it might be flowing through the fan). Furthermore, no current is flowing at all in case the contacts at the EXT SWITCH connector are properly closed. Hence the laser head does not get any power. Proceed as described in Case 5.
  2. If your PLH3D-CNC Adapter has been manufactured after July 2020, then it contains an option called „HEAD TYPE”. This option might be set incorrectly and might have been changed by the user by mistake.


Please consult the PLH3D-CNC Adapter Settings section of the Manual to check the chosen setting. For cutting and engraving laser with a built-in fan, the option has to be set to 2. For special engraving lasers with no fan (e.g. the liquid-cooled variation), the option has to be set to 1. You may also set the option to 0 for all types of engraving laser heads.

--------------------------------------------------------------------------------------------------------------------------------------

  1. The POWER LED is lit. After pressing the MODE BUTTON, the ARMED LED lights up. The laser head receives adequate power supply (the built-in fan is running), but there is no laser beam, even though it seems there are proper controlling and enabling signals at the PLH3D-CNC Adapter’s inputs. The LASER LED is not lit.

ADVICE:

Check the laser by generating a test laser pulse. 


Please follow appropriate Laser Safety Procedures and put your Laser Safety Glasses on before proceeding with the test laser pulse. The laser beam is likely to be generated at the maximum power during this test. 


Make sure the PLH3D-CNC Adapter is in the armed state. 

Press and hold the MODE BUTTON for at least 2 seconds. Laser beam should be activated for a second. During the pulse generation, the LASER LED should light up. Refer to the section Getting Started (point 8) of the Manual.

  1. If the LASER LED does not light up, then the cable connecting the PLH3D-CNC Adapter with the laser head may have a short circuit. Turn the PLH3D-CNC Adapter off. Disconnect the cable and check it. Look for possible short circuits between the wires.
    • If no issues are found, then the electronics of the PLH3D-CNC Adapter must be malfunctioning.
  1. If the LASER LED lights up, but there is no laser beam then go to Case 8.
  2. If the laser pulse has been generated successfully and the LASER LED lighted up, then there is an issue with the controlling inputs. Following scenarios are possible:
    1.  The chosen setting of the Enable Option is incorrect.
    2.  No proper controlling signal appears at the CONTROL connector.
    3.  No proper enabling voltages appear at the CONTROL connector.
    4.  The electronics of the PLH3D-CNC Adapter is malfunctioning.


Perform your tests in the given order, from 7.3.1 to 7.3.4. Always make sure the PLH3D-CNC Adapter is in the armed state. 


During the tests, ensure you always keep your Laser Safety Glasses on and follow appropriate Laser Safety Procedures, since the laser may activate at full power at unexpected moments.



7.3.1. Enable Option


Before performing any other test, check the currently chosen setting of the Enable Option. An incorrect setting usually leads to inadvertent disabling of the controlling signal.


Temporarily set the Enable Option to 0. Refer to the Manual section For Advanced Users on page 25. At this setting, the controlling inputs of the PLH3D-CNC Adapter are always enabled.

After restarting the PLH3D-CNC Adapter, arm the laser head and provide the controlling signal.


If neither the LASER LED lights up nor the laser activates, please go to point 7.3.2. in order to check the controlling inputs.


If the LASER LED lights up and the laser activates, then the previous setting of the Enable Option was apparently wrong. Check carefully what the intended voltage levels at the ENABLE1 INPUT and ENABLE2 INPUT are that shall enable the laser. 


Find the corresponding Enable Option setting in the table shown in the Manual on page 25. Now, select and store the right setting in the PLH3D-CNC Adapter. Refer to the Manual. 


After rearming, provide the controlling signal along with the enable voltages from the controller.

    • If neither the LASER LED lights up nor the laser activates, then go to point 7.3.3 in order to check the enable inputs.
    • If the LASER LED lights up and the laser activates properly, then the troubleshooting is over. You have now set the Enable Option correctly.


7.3.2. Controlling Signal


If you have an oscilloscope, check the presence of the controlling signal directly at the appropriate terminal (1,2,6, or 7) of the CONTROL terminal block. You may also use a multimeter if the controlling voltage does not change fast.


You may check the controlling inputs with a temporary wire connection:

    1. Disconnect the wires from the terminal block in the CONTROL connector.
    2. Prepare a wire with a length of 10 cm or more. Connect one side of the wire to pin 1 of the EXTENSIONS connector. 



    1. You may also alternatively connect the wire to one of the wire jumpers at the EXT SWITCH connector.



    1. Arm the PLH3D-CNC Adapter. Now run the >10 cm wire to the terminal 2 of the CONTROL connector. Refer to the pinout shown in the Dimensions and Pinout section of the Manual.


The wire connection forces a valid voltage level at the controlling input. It happens regardless of whether a proper signal is issued from the controller. If the laser head is armed, then the laser should now activate:



A different input terminal (1 or 6 or 7) can also be checked with a temporary wire connection. 


To check terminal 1 (ANGIN 5V INPUT) or terminal 6 (ANGIN 10V INPUT), run the >10 cm wire to the respective pin. 


To check terminal 7 (INVERTED TTL/PWM INPUT), connect one side of the >10 cm wire to terminal 4 of the CONTROL connector (GROUND) and then run it to terminal 7 of the CONTROL connector.


If the temporary wire connection activates the laser while the signal from the controller does not, then it seems an improper input signal from the controller appears at the CONTROL connector. Check the cable and the controller in this case.


7.3.3. Enabling Voltages


Using a multimeter or an oscilloscope, check the voltage levels at the enable inputs directly. Do so at the appropriate terminals, namely terminals 3 and 5, of the CONTROL terminal block. Compare measured levels to the levels shown in the table in the Manual on page 25 for the current setting of the „enable option”. 


Note:

- proper voltage levels have to be at BOTH enable inputs;

- if “Any State” is specified for an enable input, then the input may be either left open or attached to any permissible voltage (see page 24 of the Adapter Manual), including ground.

    • If the measured voltage levels are fully matching the setting shown in the table and the laser still does not activate, then the electronics of the PLH3D-CNC Adapter must be out of order.


7.3.4. The Electronics

    • If none of the tests described above indicated the reason for the encountered issues, then the PLH3D-CNC Adapter must be out of order.

--------------------------------------------------------------------------------------------------------------------------------------

  1. The POWER LED is lit. After pressing the MODE BUTTON, the ARMED LED lights up. The laser head receives adequate power supply (the built-in fan is running). There is a controlling signal at the PLH3D-CNC Adapter’s input and the LASER LED is lit, but there is no laser beam.

ADVICE:

The controlling signal apparently passes through the PLH3D-CNC Adapter correctly and also appears at the LASER HEAD connector. The signal either does not reach the laser head or the laser head is out of order.

  1. There may be a lacking connection in the cable between the PLH3D-CNC Adapter and the laser head at the ANGIN 5V line. Check the cable, especially the pinout:




  1. The laser head may be out of order.
  2. Although it is unlikely in such case, the electronics of the PLH3D-CNC Adapter may be out of order.