Show Posts
1
Generic Spindle interfaces, I/O boards, Misc boards and panels / Unpredictable spindle control, PMDX-107, PMDX-126, ess, mach4 Huangyang
« on: October 29, 2019, 09:20:11 PM »
I have been running a setup consisting of a 1.5 kW spindle and Huangyang converter (HY01D511B) driven by a PMDX-107, PMDX-126, and Mach 4.
When running an aircut I found that the spindle would turn off about half way through the nc routine. After retrying the routine a few times I noticed the spindle would turn off at about the same place in the program (the spindle is running maximum speed and there are no speed control commands following the initial setting).
I have found that when the spindle speed is set by Mach, the control voltage (measured between Aout and Agound) creeps up about 1-2 mV/sec. It seems that once this voltage exceeds the maximum Aout of ~4.96V the spindle turns off, and explains why it was happening at a similar time during the program execution. If the initial spindle speed is set lower, the voltage does not cross the threshold during the course of a machining operation and the spindle does not turn off. Apparently, this condition also results in spindle acceleration throughout the program. The voltage output by the 107 eventually exceeds the max. speed voltage calibrated by the trim pot. Running the manual reference voltage calibration before and after has a predictable outcome (i.e., the trim pot screw is not turning due to vibrations, and the voltage set-point at maximum speed is unchanged).
Has anyone ever seen this before? Any idea what could be causing this? All else seems to be working fine.
When running an aircut I found that the spindle would turn off about half way through the nc routine. After retrying the routine a few times I noticed the spindle would turn off at about the same place in the program (the spindle is running maximum speed and there are no speed control commands following the initial setting).
I have found that when the spindle speed is set by Mach, the control voltage (measured between Aout and Agound) creeps up about 1-2 mV/sec. It seems that once this voltage exceeds the maximum Aout of ~4.96V the spindle turns off, and explains why it was happening at a similar time during the program execution. If the initial spindle speed is set lower, the voltage does not cross the threshold during the course of a machining operation and the spindle does not turn off. Apparently, this condition also results in spindle acceleration throughout the program. The voltage output by the 107 eventually exceeds the max. speed voltage calibrated by the trim pot. Running the manual reference voltage calibration before and after has a predictable outcome (i.e., the trim pot screw is not turning due to vibrations, and the voltage set-point at maximum speed is unchanged).
Has anyone ever seen this before? Any idea what could be causing this? All else seems to be working fine.