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96-8100
1-15-96
172
TECHNICAL REFERENCE
S E R V I C E M A N U A L
VF-S
ERIES
DOOR HOLD SWITCHES
[Top outer edges of door opening (2)]
The DOOR OPEN sense switch consists of two switches; one on each side 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.
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.
Prior to performing an AUTO POWER UP or an AUTO ALL AXES operation, there are no travel limits. Thus, you can jog into
the hard stops in either direction for X, Y, or Z. After a ZERO RETURN has been performed, the travel limits will operate
unless an axis hits the limit switch. When the limit switch is hit, the zero returned condition is reset and an AUTO ALL AXES
must be done again. This is to ensure that if you hit the limit switch, you can still move the servo back away from it.
The limit switches are normally closed. When a search for zero operation is being performed, the X, Y, and Z axes will move
towards the limit switch unless it is already active (open); then they will move away from the switch until it closes again; then
they will continue to move until the encoder Z channel is found. This position is machine zero.
Auto search for zero in the Z-axis is followed by a rapid move from the limit switch position down to the tool change position.
This makes the Z-axis a little different from the other axes. The position found with the limit switch is not machine zero but
is the position used to pull tools out of the spindle. Machine zero for Z is below this by Parameter 64. Be careful during the
Z zero search and stay clear of that rapid move.
WHAT CAN GO WRONG WITH LIMIT SWITCHES?
If the machine is operated without connector P5, a LOW LUBE and DOOR OPEN alarm will be generated. In addition, the
Home search will not stop at the limit switch and will instead run into the physical stops on each axis.
If the switch is damaged and permanently open, the zero search for that axis will move in the negative direction at about 0.5
in/min until it reaches the physical travel stops at the opposite end of travel.
If the switch is damaged and permanently closed, the zero search for that axis will move at about 10 in/min in the positive
direction until it reaches the physical stops.
If the switch opens or a wire breaks after the zero search completes, an alarm is generated, the servos are turned off, and all
motion stops. The control will operate as though the zero search was never performed. The RESET can be used to turn servos
on but you can jog that axis only slowly.
TOOL CHANGER POSITION SWITCHES
[Inside of Tool Carriage (2)]
GENEVA WHEEL POSITION MARK
The turret rotation mechanism has a switch mounted so that it is activated for about 30
o
of travel of the Geneva mechanism.
When activated, this switch indicates that the turret is centered on a tool position. This switch is normally closed. The
diagnostic display will show this status of this input switch as TC MRK. A 1 indicates the Geneva wheel is in position.
Summary of Contents for VF-SERIES
Page 180: ...1 15 96 96 8100 177 TABLEOFCONTENTS TECHNICAL REFERENCE SERVICE M A N U A L VF SERIES ...
Page 235: ...96 8100 1 15 96 232 VF SERIES S E R V I C E M A N U A L ASSEMBLY DRAWINGS VF 1 COLUMN ...
Page 237: ...96 8100 1 15 96 234 VF SERIES S E R V I C E M A N U A L ASSEMBLY DRAWINGS VF 1 LEADSCREW ...
Page 239: ...96 8100 1 15 96 236 VF SERIES S E R V I C E M A N U A L ASSEMBLY DRAWINGS VF 3 COLUMN ...
Page 241: ...96 8100 1 15 96 238 VF SERIES S E R V I C E M A N U A L ASSEMBLY DRAWINGS VF 3 LEADSCREW ...
Page 245: ...96 8100 1 15 96 242 VF SERIES S E R V I C E M A N U A L ASSEMBLY DRAWINGS 3 4 2 1 ...