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GSK980TDi Turning CNC System User Manual
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Ⅱ
Operation
2.3 Overtravel Protection
Overtravel protection should be used to prevent machine from being damaged due to the
overtravel of X, Y, or Z.
2.3.1 Hardware Overtravel Protection
The stroke switches are fixed at the positive and negative maximum travel of the machine X, Z, Y
axis respectively, they are connected by the following figure. Standard PLC program defines that the
Bit7 of parameter K10 is whether the overtravel along each axis is enabled; Bit 6 is the overtravel
signal LEVEL selection. If the overtravel occurs, the stroke switch acts to make GSK980TDi stop, and
the emergency alarm issues.
When the hardware overtravel occurs, there will be an “overtravel stop” alarm in GSK980TDi.
The steps to eliminate this alarm are: In the Manual or MPG mode, move the table reversely to detach
the stroke switch (for positive overtravel, move negatively; vice versa).
2.3.2 Software Overtravel Protection
GSK980TDi sets the software overtravel protection of the machine tool by the stored stroke limit
function.There are 3 stored stroke limit areas can be set in GSK980TDi. The oblique area is the
forbidden one.
Stored stroke limit 1
Stored stroke limit 3
Stored stroke limit 2
(
the outer porhibition
)
：
the forbidden area
Stored stroke limit 2
(
the inner prohibition
)
1) Open the limit function: Set the state parameter Bit 4 of No.172 to 0, and then open the
limit detection function.
2) Stored stroke limit detection 1: The limit area boundary is set by parameter (No.045,
No.046), the external side of the setting range is limit area. Usually, this area is regarded as
the Max. stroke range of the machine tool.
3) Stored stroke limit detection 2 (G22 G23): The limit area boundary is set by parameter
