A lot of people see the spindle alarm legs on the soft, the first reaction is not the drive burned, is not the motor is finished. To speak a word of conscience, the alarm 73 most of the time with those big things have little to do, the root cause of the disease is often in those signal lines on the head.
The first thing to suspect is the feedback line itself. This is the most common root in the shop. Line from the spindle motor ass that pull out, followed by the drag chain running back and forth, every day bending around, the surface looks fine, the copper wire inside may have been folded. Plus the workshop is oil and water, oil soaked for a long time, wire skin hardening, shielding layer is also easy to be bad. The most typical symptom is sometimes good and sometimes bad, a moment to work nothing, a moment to report the alarm you upset, if you shake your hand that line, the alarm status follows the change, that did not run, the first to change the line and then say, a lot of times change the line immediately stop.
The second common thing is that the plug is loose or dirty. This situation is also more, and especially easy to be ignored. One is the plug on the motor tail, and the other is the spindle amplifier wiring the port. The plug is not inserted to the end, the snap is not tightened, the pin is oxidized and blackened, or the pinhole is glued with a layer of sludge, the signal will be transmitted intermittently. Don't underestimate this, sometimes you pull the plug off, take the cleaning agent spray, air gun blowing, and then vigorously inserted back, the alarm is gone.
It's the sensor itself that's at fault further down the line. If you check the line, the plug is also clean plug tight, the alarm is still reliant on not go, it is the turn to suspect that the spindle motor ass back of the encoder or sensor. May be inside the circuit does not work, the signal can not come out or out of the garbled code. But this situation is much less likely than the line problem.
There is also a situation is not installed correctly. Some spindles do not use an integrated encoder, is installed separately outside the kind of speed sensor. If the clearance with the gear or sensor head is not right, far away from the signal is weak, too close to rub on it does not work, the system detects that the signal strength is not enough, it is still when the broken wire to give you a report 73.
Parameters were moved by anyone is also possible. Although less, but not unheard of. For example, some people have adjusted the spindle-related parameters, the encoder type to the wrong settings, or the signal mode is not correct, the system reads the signal according to the wrong settings, of course, can not be read, also reported 73. This is more pitiful, when troubleshooting have to keep an eye out.
As for the spindle amplifier itself, it is really the last resort to consider the matter, SP9073 the code itself is aimed at "not receiving the signal” to, not the amplifier itself internal explosion. So don't just take the amp apart and send it in for repair, start with the front end where it won't cost you anything.
