QL datasheet(15/21 Pages) PANASONIC

15 / 21 page

1. The ON/OFF circuit for the guidance

load may suffer contact damage due to

surges or inrushes when the power is

turned either ON or OFF.

Consequently, insertion of a protective

circuit as per the following diagram is

recommended, in order to protect the

contacts.

2. Do not connect either irregular poles

or power sources to a switch contact.

Power connection examples (irregular

pole connection)

3. Avoid circuits where power may find

a way between the contact points (as

this may cause welding.)

PROTECTION CIRCUIT

Circuit

Cautions for use

(1) r must be a minimum

of 10

Ω;

(2) When using AC power:

Q Impossible when R

impedance is large.

W Possible when c, r

impedance is suffi-

ciently small com-

pared with R imped-

ance.

Can be used with both

AC and DC as appro-

priate.

r ~ R

C: 0.1

µF

Limit switch contact

(1) Dedicated DC use.

(2) AC is impossible

Limit switch contact

Can be used with both

AC and DC as appro-

priate.

Limit switch contact

Diode

Varistor

ZNR

Example of unsuitable power connec-

tion (abnormal power connection)

NO GOOD

Load

Load connected to same pole

GOOD

Load

Risk of AC and DC being mixed.

NO GOOD

Load

4. Using electronic switch circuits (low

power, low current)

1) Bouncing and chattering are gener-

ated due to collision between the con-

tacts when the limit switch is switching

between them, and this sometimes

causes such problems as white noises

and error pulses in both the electronic

circuit and the reverberation equip-

ment.

2) If the generation of bouncing and

chattering becomes a problem, it is

necessary to consider installing a CR

circuit or other absorption circuit given

the circuit design.

3) This is particularly necessary when

high contact reliability is needed, and

is unsuitable for silver contact switch-

es. Switches with gold contacts pos-

sess excellent performance.

100V

200V

NO GOOD

CAUTIONS FOR USE

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