22
Z
Safety Precautions
Refer to Safety Precautions for All Basic Switches.
Terminal Connection
When soldering lead wires to the Switch, make sure that the capacity
of the soldering iron is 60 W maximum. Do not take more than 5 s to
solder any part of the Switch. The characteristics of the Switch will
deteriorate if a soldering iron with a capacity of more than 60 W is
applied to any part of the Switch for 5 s or more.
Operation
•Make sure that the switching frequency or speed is within the
specified range.
1.If the switching speed is extremely slow, the contact may not be
switched smoothly, which may result in a contact failure or
contact welding.
2.If the switching speed is extremely fast, switching shock may
damage the Switch soon. If the switching frequency is too high,
the contact may not catch up with the speed.
The rated permissible switching speed and frequency indicate the
switching reliability of the Switch.
The life of a Switch is determined at the specified switching speed.
The life varies with the switching speed and frequency even when
they are within the permissible ranges. In order to determine the
life of a Switch model to be applied to a particular use, it is best to
conduct an appropriate durability test on some samples of the
model under actual conditions.
•Make sure that the actuator travel does not exceed the permissible
OT position. The operating stroke must be set to 70% to 100% of
the rated OT.
Mounting Location
•Do not use the switch alone in atmospheres such as flammable or
explosive gases. Arcing and heat generation associated with
switching may cause fires or explosions.
•Switches are generally not constructed with resistance against
water. Use a protective cover to prevent direct spraying if the switch
is used in locations subject to splashing or spurting oil or water, dust
adhering.
•Install the switch in a location that is not directly subject to debris
and dust from cutting. The actuator and the switch body must be
protected from accumulated cutting debris and dirt.
•Do not use the switch in locations subject to hot water (greater than
60°C) or in water vapor.
•Do not use the switch outside the specified temperature and
atmospheric conditions.
The permissible ambient temperature depends on the model.
(Refer to the specifications in this catalog.) Sudden thermal
changes may cause thermal shock to distort the switch and result
in faults.
•Mount a cover if the switch is to be installed in a location where
worker inattention could result in incorrect operation or accidents.
•Subjecting the switch to continuous vibration or shock may result in
contact failure or faulty operation due to abrasion powder and in
reduced durability. Excessive vibration or shock will cause the
contacts to operate malfunction or become damaged. Mount the
switch in a location that is not subject to vibration or shock and in a
direction that does not subject the switch to resonance.
•If silver contacts are used with relatively low frequency for a long
time or are used with microloads, the sulfide coating produced on
the contact surface will not be broken down and contact faults will
result. Use a microload switch that uses gold contacts.
•Do not use the switch in atmospheres with high humidity or heat or
in harmful gases, such as sulfide gas (H2S, SO2), ammonia gas
(NH3), nitric acid gas (HNO3), or chlorine gas (Cl2). Doing so may
impair functionality, such as with damage due to contacting faults
or corrosion.
•The switch includes contacts. If the switch is used in an atmosphere
with silicon gas, arc energy may cause silicon oxide (SiO2) to
accumulate on the contacts and result in contact failure. If there is
silicon oil, silicon filling, silicon wiring, or other silicon products in the
vicinity of the switch, use a contact protection circuit to limit arcing
and remove the source of the silicon gas.
Mounting
Always make sure that the power is turned OFF before mounting,
removing, or wiring the Switch, or performing maintenance.
Electric shock or burning may occur.
Selecting Models
We recommend using Drip-proof Models (protection equivalent to
IP62) in locations subject to floating dirt and dust. Other models do not
have a protective structure.
Wiring
For wiring, use a wire size that is appropriate for the applied voltage
and the supplied current. When soldering the Switch, make sure that
the capacity of the soldering iron is 60 W maximum. Do not take more
than 5 s to solder any part of the Switch. Using the Switch with
incomplete soldering may result in errors and heat, which may cause
burning. The characteristics of the Switch will deteriorate if a soldering
iron with a capacity of more than 60 W is used or if any part of the
Switch is soldered for 6 s or longer.
Precautions for Safe Use
Precautions for Correct Use
Terminal box Terminal box
Incorrect Correct
Incorrect Correct
Incorrect Separate the
installation lo-
cation from
heat sources.
Correct
Correct
(preventing malfunctions)
Incorrect