D
Dan
- Jan 1, 1970
- 0
I have an conventional AC motor control circuit that uses an MOC3012
driving a BTA06 sensitive gate triac. The design has been working well
for several years, however it has a random problem where the motor
"bumps" or rotates slightly and randomly upon initial power-up. The
motor drives a gearbox whose output shaft must not move unless
commanded to do so. I've made sure the MOC3012 is not being turned on
during power-up. I've also tried loading the triac's gate to gnd, A1,
A2, etc. with a variety of resistors with no improvement. I swapped
the MOC3012 for an MOC3043 zero-crossing driver and the problem
improved considerably, but not completely. As you might have guessed,
the power-up 'bumping' of the motor occurs more frequently if there is
a noisy load on the same circuit as my controller. It really
misbehaves with flourescent lights and soldering irons. My customer
will no longer accept any movement of the gearbox shaft, however
slight.
Any suggestions?
TIA,
Dan
driving a BTA06 sensitive gate triac. The design has been working well
for several years, however it has a random problem where the motor
"bumps" or rotates slightly and randomly upon initial power-up. The
motor drives a gearbox whose output shaft must not move unless
commanded to do so. I've made sure the MOC3012 is not being turned on
during power-up. I've also tried loading the triac's gate to gnd, A1,
A2, etc. with a variety of resistors with no improvement. I swapped
the MOC3012 for an MOC3043 zero-crossing driver and the problem
improved considerably, but not completely. As you might have guessed,
the power-up 'bumping' of the motor occurs more frequently if there is
a noisy load on the same circuit as my controller. It really
misbehaves with flourescent lights and soldering irons. My customer
will no longer accept any movement of the gearbox shaft, however
slight.
Any suggestions?
TIA,
Dan