Rockwell-automation 8520-GUM 9/Series CNC Grinder Operation and Progra Instrukcja Użytkownika Pobierz pdf (Strona 116)

100

101

Manual/MDI Operation Modes

Chapter 4

4-12

Figure 4.5

Manual Machine Home

To execute the m anual return to machine home position:

1. Select HOME under

<JOG SELECT>.

2. Place the control in manual mode (see page 4-1).

3. Determine the direction that each axis must travel to reach the home

limit switch. See documentation prepared by your system installer on

the location of the home limit switch on your speci fic machine.

4. Press the

<AXIS/DIRECTION> button for the axis and direction to

home. You can select more than one axis at one time. The axis

selected moves at the feedrate under

<SPEED/MULTIPLY>.

Important: If you choose a wrong direction for an axis, it continues

to travel in the selected direction until it contacts a hard limit and an

overtravel occurs (see chapter 1 1). Your system installer has the

option to enable some buttons or switches (typically cycl e stop)

through the PAL program to abort a jog operation or prevent the user

from homing the axis in the wrong direction. S ee your system

installer’s documentation for details.

At this point, the control:

moves the axis until it trips its home limit switch. Then the axis

decelerates to a stop

reverses the axis direction and moves off the home limit switch at a

feedrate specified in AMP

records t he distance to the nearest encoder marker or null position

moves in a direction specified in AMP an amount equal to the home

calibration value, s pecified in AMP, plus the distance from the encoder

marker or null position

This locates the machine home position. When the axis reaches this

position, the control resets the position registers to a m achine coordinate

value speci fied in AMP. This establishes the zero point of the machine

coordinate system.

Important: During the machine home operation, softlimits and

programmable zones are not active. The control cancels all active

coordinates offsets.

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