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Author Topic: motors change direction using test programme but will only jog in one direction  (Read 1309 times)
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« on: November 19, 2017, 04:35:48 PM »

my motors will go both ways when using the roadrunner test programme but if I try to manually jog they will only turn in one direction using the keyboard or mouse after this initial discovery i have added a manual wheel and this also only does the same I'm just in the initial stages of setting up the machine i have built and am new to mach3 am i missing something really obvious in the configuration i have checked and re checked all the wiring to the drivers and the ports and pins but cannot understand why the test programme runs perfectly but the manual jog does not if anyone has come across this before or has an idea as to why this is happening i would be gratefull for any feedback
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« Reply #1 on: November 20, 2017, 02:02:58 AM »

This problem can occur if the LPT parallel port (or motion controller) output is to the newer 3.3Volt TTL standard and the motor drivers are expecting a signal that is to the older 5Volt TTL standard.

Measure the voltage on an axis Direction pin and if the maximum voltage (measured whilst jogging in either direction) is 3.3Volts then that could be the issue. If you are using the computer's LPT parallel port then consider fitting a 5Volt PCI parallel port card but check these details first:  http://www.machsupport.com/forum/index.php/topic,34848.0.html


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