D4C-1202 Omron, D4C-1202 Datasheet - Page 23

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D4C-1202

Manufacturer Part Number
D4C-1202
Description
SMALL LIMIT SWITCH
Manufacturer
Omron
Series
D4Cr
Datasheets

Specifications of D4C-1202

Rohs Compliant
YES
Circuit
SPDT
Switch Function
On-Mom
Contact Rating @ Voltage
5A @ 250VAC
Actuator Type
Roller Plunger
Mounting Type
Chassis Mount
Termination Style
Cable Leads
Operating Force
1177gf
Actuator Style
Roller Plunger
Operating Force Max
11.77N
Contact Voltage Ac Max
250V
Contact Voltage Dc Max
30V
Contact Current Ac Max
5A
Contact Current Dc Max
4A
Switch Terminals
Cable
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
D4C1202
Precautions for Correct Use
Switch Operation
• The Switch in actual operation may cause accidents that cannot be
• When testing the Switch, be sure to apply the actual load condition
• All the performance ratings in this catalog are provided under the
Inductive load:
Lamp load:
Motor load:
Note:
Mechanical Characteristics
Operating Force, Stroke, and Contact Characteristics
• The following graph indicates the relationship between operating
• If the full stroke is set close to the OP or RP, contact instability may
• The following graph shows an example of changes in contact force
18
foreseen from the design stage. Therefore, the Switch must be
practically tested before actual use.
together with the actual operating environment.
following conditions unless otherwise specified.
force and stroke or stroke and contact force. In order to operate the
Limit Switch with high reliability, it is necessary to use the Limit
Switch within an appropriate contact force range. If the Limit Switch
is used in a normally closed condition, the dog must be installed so
that the actuator will return to the FP when the actuator is actuated
by the dog. If the Limit Switch is used in a normally open condition,
the actuator must be pressed to 70% to 100% of the OT (i.e., 60%
to 80% of the TT) and any slight fluctuation must be absorbed by the
actuator.
result. If the full stroke is set to the TTP, the actuator or switch may
become damaged due to the inertia of the dog. In that case, adjust
the stroke with the mounting panel or the dog. Refer to page 22, Dog
Design, page 23, Stroke Settings vs. Dog Movement Distance, and
page 24, Dog Surface for details.
according to the stroke. The contact force near the OP or RP is
unstable, and the Limit Switch cannot maintain high reliability.
Furthermore, the Limit Switch cannot withstand strong vibration or
shock.
1. Ambient temperature: +5 C to 35 C
2. Ambient humidity: 40% to 70%.
An inductive load causes a problem especially in DC circuitry.
Therefore, it is essential to know the time constants (L/R) of
the load.
Precautions for All Switches
A minimum power factor of 0.4 (AC) or a
maximum time constant of 7 ms (DC)
An inrush current 10 times higher than the
normal current
An inrush current 6 times higher than the
normal current
Solenoid
(Approximately 10 to 20 times higher)
Incandescent
lamp (Approximately 10 to 15 times
higher)
(Approximately
Motor
5 to 10 times
higher)
Relay
(Approxi-
mately 4 to 5
times higher)
If the Limit Switch is used so that the actuator is constantly pressed,
it will fail quickly and reset faults may occur. Inspect the Limit Switch
periodically and replace it as required.
Mechanical Conditions for Switch Selection
• The actuator must be selected according to the operating method.
• Check the operating speed and switching frequency.
• Do not impose excessive force on the actuator, otherwise the
• Make sure that the stroke is set within the suitable range specified
Electrical Characteristics
Electrical Characteristics for Switch Selection
• The switching load capacity of the Switch greatly varies between AC
• If the load is inductive, counter-electromotive voltage will be
• If the load is a minute voltage or current load, use a dedicated
actuator may become damaged or not operate correctly.
for the model, or otherwise the Switch may break.
and DC. Always be sure to apply the rated load. The control capacity
will drastically drop if it is a DC load. This is because a DC load has
no current zero-cross point, unlike an AC load. Therefore, if an arc
is generated, it may continue comparatively for a long time.
Furthermore, the current direction is always the same, which results
in a contact relocation phenomena whereby the contacts easily stick
to each other and do not separate when the surfaces of the contacts
are uneven.
generated. The higher the voltage is, the higher the generated
energy will be, which will increase the abrasion of the contacts and
contact relocation phenomena. Be sure to use the Switch within the
rated conditions.
Switch for minute loads. The reliability of silver-plated contacts,
which are used by standard Switches, will be insufficient if the load
is a minute voltage or current load.
1. If the operating speed is extremely low, the switching of the
2. If the operating speed is extremely high, the Switch may break
movable contact will become unstable, thus resulting in
incorrect contact or contact weld.
due to shock. If the switching frequency is high, the switching
of the contacts cannot catch up with the switching frequency.
Make sure that the switching frequency is within the rated
switching frequency.
OF
Changes to opposite side
Changes to opposite side
Contact force
OTP
FP
Stroke
Stroke

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