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TABLE OF CONTENTS
TECHNICAL REFERENCE
SERVICE
MANUAL
VF-SERIES
16. SWITCHES
16.1 LAMP ON/OFF SWITCH
An on/off switch is supplied for the operators lamp. It is located on the side of the control cabinet below all of the motor
connectors.
16.2 DOOR OPEN SENSE SWITCH
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 Door Hold function. When the door is closed again, operation will continue
normally.
The wiring for the door switches is wired in either of two paths. The first one applies to machines built before
March 1990; this uses connector P5 at the side of the cabinet and routes the wires past the oiler and through the base of the
mill. The second wiring routes through the front panel support arm and down through the top of the plastic enclosure.
If the doors are open, you will not be able to start a program. Door hold will not stop a tool change operation, will not turn
off the spindle, and will not turn off the coolant pump.
The door hold function can be temporarily disabled with Setting 51, but this setting will return to OFF when the control is
turned off.
16.3 LIMIT SWITCHES
NOTE: There are fourteen (14) 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.
SPINDLE ORIENT SWITCH
[Top rear of transmission]
A normally-open switch that is held closed is used to sense when the pin drops in to lock the spindle. When the pin drops
the switch opens, indicating orientation is complete.
The normally-closed side of the same switch that is held open, is wired to the spindle drive and commands it into a Coast
Stop condition. This is done to ensure the spindle motor is not powered when the pin is locking the spindle.
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