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Originally Posted by
Caprirs
If there were a problem with an AMC amp, only that amp would show the red LED while the others would show green. Thus, I doubt the issue lies downstream of the amps.
First, verify that the emergency stop circuit is not activated. On the front keyboard is a tiny LED that will flash when the emergency stop button is pressed or one of the axis over travel limit switches is tripped. The e-stop and limit switches are all wired normally closed so an open anywhere in the switches or wiring will cause this. If the emergency LED is not blinking...
Check incoming voltage from the wall. The machines are rated to run on 220VAC +/- 10%. In reality, the closer to the edges of that range, the more likely the machine will have trouble. The only items to use the three phases are the coolant pump(s) and the spindle motor/amp. Everything else runs single phase using the power from the big gray transformer in the bottom of the back cabinet. Use a meter and check each leg/phase to earth ground. If the incoming three phase from the wall has a wild/high leg, don't have that leg feeding the big gray transformer. Moving the phases around will affect the rotation of the coolant pump, but not the spindle.
On the Big Board in the back cabinet, find the three screw terminal strip along the bottom edge towards the right side. There will be 120VAC between the two spots with wires attached. It is critical that the voltage at this connection be between ~117-123VAC. This is because the DC power supply for the AMC amps is unregulated. If the voltage is outside that range, change the taps in the big gray transformer in the bottom of the cabinet. When the voltage is outside the specified range, the big board can prevent the AMC amps from enabling.
The machine should have a Mitsubishi spindle motor and amp. When power is applied, the amp should display E7 (I think). When enabled by the Dyna control, the display will read the current rpm of the spindle motor which better be 0 at start up.
Since the history of the machine is unknown, it's possible previous owners have tried some odd things. You'll have to check with Dyna, but it is possible someone has loaded software on the PC hard drive that is not compatible with the firmware in the eproms on the boards. There are a total of five eproms each with a sticker on the chip indicating socket and checksum, three on the big board and two on the keyboard. The software and firmware must all be matched.
Where is the machine located?