How the Machine and Motor Control boards receive power:
- The injector board receives 24vdc and steps it down to 12vdc.
- We pull 12vdc from one of the injector boards to power the machine controller pcb.
- We pull 12vdc from one of the injector boards to power the motor control pcb.
By design:
- The motor control pcb is fed from the top injector board (1-8)
The machine control pcb is fed from the bottom injector board (33-39)
However – it is possible to supply power to either control pcb from any injector board.
The burning of this board is caused by the failure of an injector board to provide 12vdc. This is a rare occurrence that we have seen a handful of times in the history of the injection machine.
Replacing only the burned pcb will likely result in another burned pcb.
The best recommendation domestically to correct this is to exchange/replace the enclosure.
Further troubleshooting will require the customer to have access to a voltmeter, good injector boards and a good motor/machine control pcb (depending on which pcb was burned). Basically, a good enclosure.
For International Distributors who NEED to, and Domestic Customers who WANT to troubleshoot the issue further, they will need their voltmeter set to DCV.
Steps:
- Remove the white plug on the top injector pcb. This is the 12vdc output voltage source.
- Inserting the probes for the voltmeter into the top and bottom plug holes, you should read ~12vdc. A reading of over 14vdc would indicate a problem pcb.
- Continue to test each board for proper 12vdc output to identify the bad board(s). Replace the injector board and verify you now have the correct output 12vdc. Then replace the failed motor or machine control pcb.