Omron D4N Series Manual page 32

Typical Problems, Probable Causes, and Remedies
Problem
1. The Actuator does not
operate.
2. The Actuator does not return.
3. The Actuator has been
deformed.
4. The Actuator is worn.
5. The Actuator has been
damaged.
Mechanical
failure
There is a large deviation in
operating position
(with malfunctioning involved).
The terminal part wobbles (The
mold part has been deformed).
Contact chattering.
Oil or water penetration.
Failures
related to
chemical or
physical
characteristics
Deterioration of the rubber part.
Corrosion (rusting or cracks).
Failures
No actuation.
related to
No current breakage.
electric
Contact welding.
characteristics
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Probable cause
The shape of the dog or cam is incorrect.
The contacting surface of the dog or cam is rough.
The Actuator in use is not suitable.
The operating direction of the Actuator is not
correct.
The operation speed is excessively high.
Excessive stroke.
The rubber or grease hardened due to low
temperature.
The accumulation of sludge, dust, or cuttings.
Dissolution, expansion, or swelling damage to the
rubber parts of the driving mechanism.
Damage to and wear and tear of the internal
movable spring.
Wear and tear of the internal mechanism.
The loosening of the mounting screws causing
the position to be unstable.
Overheating due to a long soldering time.
The Switch has been connected to and pulled by
thick lead wires with excessive force.
High temperature or thermal shock resulted.
Vibration or shock is beyond the rated value.
Shock has been generated from a device other
than the Switch.
Too-slow operating speed.
The sealing part has not been tightened
sufficiently.
The wrong connector has been selected and does
not conform to the cable.
The wrong Switch has been selected.
The terminal part is not molded.
The Switch has been burnt or carbonated due to
the penetration of dust or oil.
The expansion and dissolution of the rubber
caused by solvent or lubricating oil.
Cracks due to direct sunlight or ozone.
Damage to the rubber caused by scattered or
heated cuttings.
The oxidation of metal parts resulted due to
corrosive solvent or lubricating oil.
The Switch has been operated in a corrosive
environment, near the sea, or on board a ship.
The electrical deterioration of metal parts of the
Switch resulted due to the ionization of cooling
water or lubricating oil.
The cracking of alloyed copper due to rapid
changes in temperature.
Inductive interference in the DC circuit.
Carbon generated on the surface of the contacts
due to switching operations.
A short-circuit or contact welding due to contact
migration.
Contact welding due to an incorrectly connected
power source.
Foreign materials or oil penetrated into the
contact area.
(c)Copyright OMRON Corporation 2007 All Rights Reserved.
Precautions for All Switches
Remedy
Change the design of the dog or cam
and smooth the contacting surface of
the cam.
Scrutinize the suitability of the
Actuator.
(Make sure that the Actuator does not
bounce.)
Attach a decelerating device or change
the mounting position of the Switch.
Change the stroke.
Use a cold-resistive Switch.
Use a drip-proof model or one with high
degree of protection.
Use a protection cover and change the
solvent and materials.
Regularly inspect the Switch.
Use a better quality Switch.
Tighten the mounting screws securely.
Use a mounting board.
Solder the Switch quickly.
Change the lead wire according to the
carry current and ratings.
Use a temperature-resistive Switch or
change mounting positions.
Attach an anti-vibration mechanism.
Attach a rubber circuit to the solenoid.
Increase the operating speed (with an
accelerating mechanism).
Use a drip-proof or waterproof Switch.
Use the correct connector and cable.
Use an oil-resistant rubber or Teflon
bellows.
Use a weather-resistant rubber or
protective cover.
Use a Switch with a metal bellows
protective cover.
Change the lubricating oil or change
mounting positions.
Use a crack-resistant material.
Add an erasing circuit.
Use a Switch with a special alloy
contact or use a sealed Switch.
Reduce the switching frequency or use
a Switch with a large switching
capacity.
Change the circuit design.
Use a protective box.
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