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Start chip conveyer forward |
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Stop chip conveyer |
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Momentarily jog conveyer in reverse |
You can operate the chuck manually, using the pushbuttons on the headstock, or automatically in a program cycle, using M functions.
Press the Green button on the headstock to close the chuck and grip the part.
Press the Red button on the headstock to open the chuck and release the part.
In a program, use M10 to grip the part; use M11 to release the part.
The spindle must be stopped in order for the chuck to operate. The chuck must be closed in order for the spindle to start.
You can switch between OD gripping and ID gripping modes by rotating the lever on top of the hydraulic unit, to the right of the solenoid valves. In OD gripping mode, "chuck closed", as selected with the Green pushbutton or M10, is jaws-in. In ID gripping mode, "chuck closed" is jaws-out.
When you shift the headstock into a different gear range, you must notify the control of the change so that it can command accurate spindle speeds.
You do this with the M41, M42 and M43 codes. These codes can be entered at the F3/MDI prompt, or may be written into a part program.
M41 Low range 0 - 185 RPM
M42 Mid range 0 - 740 RPM
M43 High range 0 - 2955 RPM
When no program cycle is active, you can rotate the turret manually using the Turret Index key on the jog panel. You can also index the turret to any specified tool using the F7/ATC key, available on the Setup screen and in the Offset Library.
In a program cycle, the control will automatically index the turret whenever a T code specifying a new turret position is encountered. T codes are four digits. The first two digits specify the turret position; the last two digits specify the tool offsets to use.
Available turret positions are 1, 2, 4, 6, 7, 8, 10 and 12. Position numbers 3, 5, 9 and 11, as well as any number less than 1 or greater than 12, are invalid and will trigger an error.
You can start and stop the chip conveyer using the jog panel keys:
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Start chip conveyer forward |
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Stop chip conveyer |
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Momentarily jog conveyer in reverse |
The work light will switch on automatically on power up. If needed, you can then switch it off and on by pressing the Work Light key on the jog panel.
The PLC program can generate the following fault messages, in addition to those listed in the Centroid operator's manual.
You can use the PLC Diagnostic display on the console to view the PLC input and memory locations mentioned with some of the following fault conditions. At the control's main screen, press Alt-I to activate the PLC Diagnostic display. Press Alt-I again to dismiss it.
The Diagnostic display shows four rows of red and green dots: the first row shows PLC inputs 1 through 80; the second row PLC outputs 1 through 80; the third row PLC memory bits 1 through 80; and the fourth row PLC program stages 1 through 80.
You can use the arrow keys to move a highlight box over any of these locations. The name of the highlighted location will be displayed at the bottom left.
In addition, the values of the first twelve Word (numeric) variables are displayed below the red and green bit indicators. Word variables are used to store tool numbers, turret positions, fault codes, and other scalar data.
Once the cause of a fault is addressed, the fault can be cleared either by pressing and releasing Emergency Stop, or in most cases by pressing the "Aux12" key. Aux12 is the rightmost unlabeled Blue key on the jog panel, to the right of the coolant controls:
The hydraulic pump motor has tripped its overload relay in the tailstock-end magnetics cabinet. The PLC does not check the overload directly, but instead monitors the hydraulic pump starter (1M). If Emergency Stop is released and the PLC itself is not in a fault condition, then 1M should be closed. If it is not, then an overload condition is assumed.
Investigate possible causes and reset the tripped overload. Press Emergency Stop or Aux12 to clear the fault.
References:
PLC INP17: indicates the 1M starter state. Green = 0 = closed, Red = 1 = open PLC MEM25: latches fault until reset with Emergency Stop: Red = 0 = okay, Green = 1 = fault Schematic: Lines 25, 57, 82
A program cycle attempted to start the spindle (M3 or M4) while the chuck was not closed to grip a part. If you seem to be getting this message in error, double-check chuck operation and the ID/OD gripping selection lever on top of the hydraulic unit.
References:
PLC OUT9: power to chucking solenoid. Green = 1 = closed (gripping), Red = 1 = open (released) PLC MEM26: latches fault until reset with Emergency Stop: Red = 0 = okay, Green = 1 = fault Schematic: Line 105
The spindle motor cooling fan has tripped its overload relay in the tailstock-end magnetics cabinet. The PLC does not check the overload directly, but instead monitors the fan motor starter (3M). 3M should be closed at all times when power is on. If it is not, then an overload condition is assumed.
Investigate possible causes and reset the tripped overload. Press Emergency Stop or Aux12 to clear the fault.
References:
PLC INP15: indicates the 3M starter state. Green = 0 = closed, Red = 1 = open PLC MEM30: latches fault until reset with Emergency Stop: Red = 0 = okay, Green = 1 = fault Schematic: Lines 29, 56, 82
The Centroid PLC interpreter software has encountered an error while processing the PLC logic. Notify your Centroid dealer and service technician.
References:
PLC W8: indicates numeric fault code
More than one turret position sensor was closed simultaneously, for more than a half second. This may indicate a stuck switch, mechanical failure, or shorted wire.
Check the PLC Diagnostic display to identify the offending sensors.
To move the turret to another position when this fault is present:
References:
PLC INP18 - INP29: indicate the turret sensors states. Green = 0 = sensing, Red = 1 = not sensing PLC MEM24: latches fault until reset with Emergency Stop: Red = 0 = okay, Green = 1 = fault Schematic: Lines 83 - 88
A request was made for a non-available turret position. Available turret positions are 1, 2, 4, 6, 7, 8, 10 and 12. A program may call for any tool offsets from 0-99, but must always specify a valid turret position. For example:
T0101 ; okay (turret position 1, tool offsets 1)
T0808 ; okay (turret position 8, tool offsets 8)
T0134 ; okay (turret position 1, tool offsets 34)
T1290 ; okay (turret position 12, tool offsets 90)
T0001 ; error (turret position 0 is not available)
T0909 ; error (turret position 9 is not available)
T3434 ; error (turret position 34 is not available)
Check the G code and conversational programs for proper tool numbers. Check the Tool Library to ensure that each tool number you use is paired with a valid turret position.
References:
PLC W2: indicates requested turret position PLC MEM24: latches fault until reset with Emergency Stop: Red = 0 = okay, Green = 1 = fault
During an automatic tool change, the turret did not unlock within 2 seconds.
This error is currently disabled, because the turret unlock limit switch is not working. The PLC program instead ignores the switch and assumes that the turret will unlock without error.
As a practical matter, any failure to unlock is almost certain to be followed by a failure to rotate to the new position in the allowed time (see error 9023).
During an automatic tool change, the turret did not reach the requested position within 10 seconds.
If the turret did in fact rotate a full turn or more, then this is probably a tool sensor failure. If the sensor for the target position does not close or is not detected, then the turret will pass that position by without seeing it. Check sensors and current tool number on the PLC Diagnostic display. The manual Turret Index key is useful for continuously rotating the turret while you watch the PLC data.
If the turret did not move at all, then it is probably a power problem affecting 4SOL, the unlock and rotate solenoid.
References:
PLC INP18 - INP29: indicate the turret sensors states. Green = 0 = sensing, Red = 1 = not sensing PLC MEM24: latches fault until reset with Emergency Stop: Red = 0 = okay, Green = 1 = fault PLC W2: indicates current turret position, based on the last closed sensor Schematic: Lines 82 - 89 (turret sensors)
Lines 41 - 46, 103 (power to unlock/rotate solenoid)
During an automatic tool change, the turret did not lock back down within 2 seconds.
This error is currently disabled, because the turret unlock limit switch is not working. The PLC program instead ignores the switch and assumes that the turret will lock without error.
A failure to lock could have undesirable consequences, as the program may proceed to cut with the tool tip out of position. For this reason, it would be wise to investigate the mechanical issues with the turret that prevent it from triggering and releasing the lock/unlock switch as expected.
