D4MC
Safety Precautions
For details, be sure to read
Safety Precautions for All Limit Switches
.
Operating Environment
•
Seal material may deteriorate if a Switch is used outdoor or where
subject to special cutting oils, solvents, or chemicals. Always
appraise performance under actual application conditions and set
suitable maintenance and replacement periods.
•
Install Switches where they will not be directly subject to cutting
chips, dust, or dirt. The Actuator and Switch must also be protected
from the accumulation of cutting chips or sludge.
•
Constantly subjecting a Switch to vibration or shock can result in
wear, which can lead to contact interference with contacts,
operation failure, reduced durability, and other problems.
Excessive vibration or shock can lead to false contact operation or
damage. Install Switches in locations not subject to shock and
vibration and in orientations that will not produce resonance.
•
The Switches have physical contacts. Using them in environments
containing silicon gas will result in the formation of silicon oxide
(SiO
2
) due to arc energy. If silicon oxide accumulates on the
contacts, contact interference can occur. If silicon oil, silicon filling
agents, silicon cables, or other silicon products are present near the
Switch, suppress arcing with contact protective circuits (surge
killers) or remove the source of silicon gas.
Operating
Excessive dog angle, operating speed, or overtravel (OT) may
damage the actuator. Check that OT has a sufficient margin. The
actual OT should be rated OT
×
0.7 to 1.
Handling
•
Do not expose the Switch to water exc60
°
C or use it in
steam.
•
Do not use the Switch in oil or water.
•
An 8.5-dia. to 10.5-dia. cable can be applied as seal rubber for the
lead wire outlet. (Use two- or three-core cable of VCT1.25 mm
2
.)
•
When detaching the Terminal Protective Cover, insert a
screwdriver and apply a force in the opening direction. Do not use
excess force to remove the cover. Doing so may cause deformation
in the fitting section and reduce the holding force.
•
When mounting the Terminal Protective Cover to the case, align the
cover on the case and then press the cover down to mount it firmly.
If the cover is pressed down in an inclined position, rubber packing
will deform and thus affect the sealing capability.
Mounting
•
When mounting the Switch with screws on a side surface, fasten
the Switch with M4 screws and use washers, spring washers, etc.,
to ensure secure mounting.
•
When mounting the Panel Mount-type Switch (D4MC-5000, D4MC-
5020, or D4MC-5040) with screws on a side surface, remove the
hexagonal nuts from the actuator.
•
When mounting the panel mount type on a panel, be careful not to
tighten to an excessive torque. Tightening the screws to a torque
exceeding 4.91 N
·
m will cause the plunger to fail.
Tightening Torque
A loose screw may cause malfunctions. Be sure to tighten each
screw to the proper tightening torque as shown in the table.
Precautions for Use
Not Suitable
Suitable
No.
Type
Appropriate tightening
torque
(1)
Terminal screw
0.78 to 1.18 N
·
m
(2)
Panel mounting screw
2.94 to 4.92 N
·
m
(3)
Side mounting screw
1.18 to 1.47 N
·
m
Rubber packing
Rubber packing
Two, 4.3-dia.
or M4 screw holes
25.4
±
0.15
Mounting Holes
12.5
+0.2
0
dia.
12.5
+0.2
0
dia.
5
+0.2
0
13
+0.2
0
D4MC-5000
D4MC-5020, D4MC-5040
Mounting Hole Dimensions
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5
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