DOOR INTERLOCK FUNCTION P-17
<Potential hazards>
Please also refer to page 2 and 3, where several examples of potential hazards and
possible accidents are described.
WARNING
If the door interlock function is "released", this constitutes a very
dangerous situation since single block operation, MDI operation and
manual operations (restriction applies on rapid traverse rate for axis
movement) are permitted while the door is open, which may lead to
injuries.
If the door interlock function is "released", and the automatic door open
command (M85 or AUTOMATIC DOOR OPEN switch) is given while the
single block function is valid, the following danger exists since the door is
unlocked permitting the door to be opened even while the machine is
operating, independent of the selected mode or the operation presently
carried out (automatic operation, manual operation).
Since serious human accidents including death could be caused due to
the danger described above, sufficient care must be paid. Anticipated
danger and possible accidents, which exist or will likely occur, are
described below.
1.
The operator becomes entangled in the rotating parts of the machine
because the spindle starts rotating while the operator is touching the
chuck or the workpiece or the operator touches the chuck or the
workpiece while the spindle is rotating.
2.
A workpiece or chuck jaw that becomes disengaged from the chuck
while the spindle is rotating due to some reason (e.g. mischucking,
lowered workpiece gripping force caused by excessively heavy
cutting force or centrifugal force, interference of a cutting tool with
the workpiece caused by programming error or incorrect program
check) flies out and strikes the operator or a person standing nearby.
3.
The operator is caught by, or entangled in, the moving or rotating
turret.
4.
The hand or foot of an operator comes into contact with the chip
conveyor while it is operating and becomes entangled with the
conveyor.
5.
The operator or a person standing near the machine is splashed with
chips and coolant, or chips and coolant get into the eyes.
For other danger, the customer is required to pay due attention.
