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ZC-W355 Datasheet(PDF) 7 Page - Omron Electronics LLC

Part # ZC-W355
Description  Small, High-precision ENclosed Switch
Download  8 Pages
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Manufacturer  OMRON [Omron Electronics LLC]
Direct Link  http://www.omron.com/index3.html
Logo OMRON - Omron Electronics LLC

ZC-W355 Datasheet(HTML) 7 Page - Omron Electronics LLC

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7
ZC-
@55
Safety Precautions
Refer to 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
(SiO2) 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.
Dog Angle
When operating the roller type, be sure to set the dog angle to less than
30
° (even when operating at a low speed). Operating the model at a dog
angle exceeding 30
° will soon cause abrasion or damage. Do not apply a
twisting force to the plunger. Set the OT to 70% to 100% of the specified
value so that the actuator will not exceed the OT.
Handling
• 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.
• A 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 mm2.)
• Use weather-proof rubber (chloroprene rubber) as seal rubber for
the ZC-N22(21)55.
Micro Load Models
Contact failure may occur is a General-purpose Switch is used to
switch a microload circuit. Use Switches within the areas shown in the
following chart. Even when using Microload Switches within the area
shown below, contact wear will become more extreme with loads that
generate surge current when switching and durability will be
adversely affected. If necessary, insert a contact protective circuit.
Microloads are indicated by N standard reference values. This value
represents the failure rate at a 60% (
λ60) reliability level. (JIS C5003)
The equation
λ60 = 0.5 × 10−6/operations indicates that a failure rate
of 1/2,000,000 operations can be expected at a reliability level of 60%.
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 Enclosed Switch (ZC-Q55, ZC-
Q2255, or ZC-Q2155) with screws
on a side surface, remove the
hexagonal nuts from the actuator.
Appropriate Tightening Torque
A loose screw may result in a malfunction. Be sure to tighten each
screw to the proper tightening torque as shown below.
Operation
With the ZC-Q22(21)55, an
appropriate OT line is marked on
the plunger. Set the OT so that it is
between the two X-surface lines.
Precautions for Correct Use
Not Suitable
Suitable
Rubber packing
Rubber packing
Model
ZC-
@55-01
ZC-
@55
Minimum applicable
load
5 VDC 1mA
5 VDC 160mA
No.
Type
Appropriate Tightening
Torque
(1)
Terminal screw
0.78 to 1.18 N·m
(2)
Panel mounting screw
4.90 to 7.84 N·m
(3)
Side mounting screw
1.18 to 1.47 N·m
Applicable
area for
General-
purpose
Models
(ZC-
@55)
30
24
12
5
0
1
10
100
1,000
Current (mA)
0.1
100 mA
1 mA
26 mA
0.8 W
100 mA 160 mA
Not
applicable
Applicable area
for Microload
Models
(ZC-
@55-01)
Two, 4.3-dia. or M4 screw holes
25.4±0.15
Mounting Holes
14.5+0.2
0
dia.
Mounting Holes


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