QL datasheet(11/21 Pages) PANASONIC

11 / 21 page

Standard glossary

• Fixed rating values

The values that guarantee the stan-

dards for the limit switch characteris-

tics and functions. For example, the

rated current and rated voltage,

which are preset conditions (load

type, current, voltage, frequency,

etc.)

• Operating object

The mechanism and mountings that

operate the limit switch actuator.

Used for mechanical operators

such as cams and dogs.

• Detective object

The unit other than mechanical

mountings that operate the limit

switch. Products, parts, jigs, etc.

• Reaction spring (movable spring)

The mechanical part that switches

the limit switch contact is called

either the reaction spring or the

moveable spring.

• Contact

When the counter-spring revolves,

power is switched on and off through

the contact between metal parts

• Contact gap

The effective clearance between the

fixed contact and the moveable con-

tact. Also called breaking distance.

• Contact arrangement

The construction of the electrical

input/output circuit depending on

use. For example, the following two

applications:

• Contact type

Used in opposition to a semiconduc-

tor switch that has switching charac-

teristics. Fulfills switch functions

through a mechanical ON/OFF con-

tact.

• Terminal mold

After wiring, the connecting part is

molding by epoxy resin for water-

proof, oil-resistant and dust-proof

capabilities.

CONSTRUCTION

• Actuator

This part directly detects movement

of the dog, cam, and so forth in the

operating unit, and transmits external

force to the changeover mechanism,

thereby engaging the moveable con-

tact and operating the switch.

• Headblock

An independent part of the actuator

mechanism of the Limit Switch.

• Wiring vent (cord vent)

The seal on the wiring at the mouth

of the wiring vent. Also called the

conduit vent for the screw hole used

in the wiring.

• Terminals

The part of the wiring work in the

wiring that forms the circuit for elec-

trical input and output.

OPERATING CHAR-

ACTERISTICS

• Operating Force (O.F.)

The force required to cause contact

snap-action. It is expressed in terms

of force applied to the actuator.

• Release Force (R.F.)

The force to be applied to the actua-

tor, at the moment contact snaps

back from the operated position to

unoperated position.

• Pretravel (P.T.)

Distance of the actuator movement

from free position to operating posi-

tion.

• Overtravel (O.T.)

The distance which the actuator is

permitted to travel after actuation

without any damage to the switching

mechanism.

• Total Travel (T.T.)

The distance which the actuator is

permitted to travel from free position

without any damage to the switching

mechanism.

• Movement Differential (M.D.)

The distance from operating to

release position of the actuator.

• Operating Position (O.P.)

The position of the actuator when the

traveling contact snaps to the fixed

contact.

• Release Position (R.P.)

The position of the actuator when the

traveling contact snaps back from

the operating position to its original

position.

• Free Position (F.P.)

Position of the actuator when no

force is applied to it.

TECHNICAL INFORMATION

[1 Form C(Single Pole Double Throw)]

[1 Form Z(Double Break Double Make)]

COM

N.O.

N.C.

N.O.

Cord vent

Front view

Reset spring

Pushbutton

Roller

Cam

Reset spring

Plunger

Roller

Arm

Head block

Pushbutton

Cam

Roller

Actuator

VL limit switch

R.T.

O.F.

F.P.

O.T.T.F.

M.D.

Standard position

O.P.

P.T.

R.P.

T.T.

R.P.

O.T.

M.D.

O. P. Operating position

R.P.

R.F.

O. P. Operating position

P.T. P.T.

Free position

O.T.

M.D.

Note: F.P., O.P., and R.P. are expressed as distances

from the standard position.

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