ATQ20122SLZ datasheet(18/22 Pages) PANASONIC

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Panasonic Industry Co., Ltd. Electromechanical Control Business Division

industrial.panasonic.com/ac/e/

ASCTB414E 202210

Panasonic Industry Co., Ltd. 2022

GUIDELINES FOR SIGNAL RELAYS USAGE

■ Long term current carrying

A circuit that will be carrying a current continuously for

long periods without relay switching operation. ( circuits for

emergency lamps, alarm devices and error inspection that,

for example, revert only during malfunction and output

warnings with form B contacts )

Continuous,long-term current to the coil will facilitate

deterioration of coil insulation and characteristics due to

heating of the coil itself. For circuits such as these, please

use a magnetic-hold type latching relay. If you need to use

a single stable relay, use a sealed type relay that is not easily

aﬀected by ambient conditions and make a failsafe circuit

design that considers the possibility of contact failure or

disconnection.

■ DC Coil operating power

Steady state DC current should be applied to the coil.

The wave form should be rectangular. If it includes ripple,

the ripple factor should be less than 5 %. However,

please check with the actual circuit since the electrical

characteristics may vary.

The rated coil voltage should be applied to the coil and the

set/reset pulse time of latching type relay diﬀers for each

relays, please refer to the relay's individual speciﬁcations.

■ Coil connection

When connecting coils of polarized relays, please check coil

polarity ( ＋, − ) at the internal connection diagram

( Schematic ).

If any wrong connection is made, it may cause unexpected

malfunction, like abnormal heat, ﬁre and so on, and circuit

do not work.

Avoid impressing voltages to the set coil and reset coil at the

same time.

■ Maximum allowable voltage and temperature rise

Proper usage requires that the rated coil voltage be

impressed on the coil.

Note, however, that if a voltage greater than or equal to the

maximum continuous voltage is impressed on the coil, the

coil may burn or its layers short due to the temperature rise.

Furthermore, do not exceed the usable ambient temperature

range listed in the catalog.

● Operate voltage change due to coil temperature rise

( hot start )

In DC relays, after continuous passage of current in the

coil, if the current is turned OFF, then immediately turned

ON again, due to the temperature rise in the coil, the

operate voltage will become somewhat higher. Also,

it will be the same as using it in a higher temperature

atmosphere.

The resistance/temperature relationship for copper wire is

about 0.4 % for 1 ℃, and with this ratio the coil resistance

increases.

That is, in order to operate of the relay, it is necessary

that the voltage be higher than the operate voltage and

the operate voltage rises in accordance with the increase

in the resistance value.

However, for some polarized relays, this rate of change is

considerably smaller.

PRECAUTIONS FOR COIL INPUT

■ For cautions for use, please read " GUIDELINES FOR RELAY USAGE ".

https://industrial.panasonic.com/ac/e/control/relay/cautions_use/index.jsp

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