470
TECHNICAL REFERENCE
June 1999
96-8000
12.17 SWITCHES
LAMP O N/OFF S WITCH
An on/off switch is supplied for the operator's lamp. It is located on the side of the operatorîš’s pendant.
DOOR O PEN S ENSE S WITCH
The DOOR OPEN sense switch is a magnetic reed switch type and consists of two switches; one on each half
of the enclosure front doors. These switches are normally closed and wired in series. When the doors open,
one or both of these switches will open and the machine will stop with a îš“Door Holdîš” function. When the door is
closed again, operation will continue normally.
The wiring for the door switches is routed through the front panel support arm and down through the top of the
enclosure.
If the doors are open, you will not be able to start a program. Door Hold will not stop a tool change operation or
a tapping operation, and will not turn off the coolant pump. Also, if the doors are open, the spindle speed will be
limited to 750 RPM.
The Door Hold function can be temporarily disabled by turning Setting 51 on, if Parameter 57 bits DOOR STOP
SP and SAFETY CIRC are set to zero, but this setting will return to OFF when the control is turned off.
LIMIT S WITCHES
There are a number of limit switches located on the VMC, and some are difficult to reach. Ensure the problem
is the switch before beginning removal procedures. The following is a list of all switches, their general location,
and a functional description:
CLAMP/UNCLAMP SWITCHES
[Tool Release Piston Assembly (2)]
There are two switches used to sense the position of the tool clamping mechanism. They are both normally
closed and one will activate at the end of travel during unclamping and the other during clamping. When both
switches are closed, it indicates that the draw bar is between positions.
A tool change operation will wait until the unclamped switch is sensed before the Z-axis pulls up from the tool.
This prevents any possibility of breaking the tool changer or its support mounts.
The diagnostic display can be used to display the status of the relay outputs and the switch inputs.
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