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NR-HLD-42 Datasheet(PDF) 7 Page - Nais(Matsushita Electric Works) |
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NR-HLD-42 Datasheet(HTML) 7 Page - Nais(Matsushita Electric Works) |
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7 / 8 page  NR 118 AC operation of latching relays When using circuits such as those at the right, avoid continued or extended latch- ing or resetting power input. Latching switch 1 coil bistable type Reset switch Latching switch 2 coil bistable type Reset switch 2 5 3 6 Capacitor discharge operation of latching types When operating latching types by dis- charge of a capacitor, more reliable oper- ation can be expected if the time to reach pick-up voltage is greater than 2 ms at 5 to 10 µF: (24 V type). NR relay coil Specified Pick - up voltage more than 2 ms t (V) SW C Flicker circuit NR relay contact CC 5 6 2 3 Automatic coil circuit interruption Misoperation may occur in self-operated cutoff circuits such as shown at right. This can be avoided by adding a resistor and capacitor and increasing the pick-up volt- age to above that specified. In a timer circuit, step-pulse voltage from PUT (Programmable Unijunction Transis- tor) or SBS (Silicon Bilateral Switch) is recommended. NR relay contact NR relay coil SW NR relay coil Coil voltage wave form V T (Time) Residual voltage When single side stable types or latching types are driven by transistor or UJT, re- sidual voltage is sometimes applied to the coils and decreases contact pressure at N.O. side even if the transistor or UJT are in OFF condition. As a result, characteris- tics of relays may be harmed. Design your circuits in principle to make such residual voltage zero. Short circuit prevention between N.C. and N.O. The separation of loads or insertion of a resistor for circuit protection are recom- mended for the circuits where large cur- rent flows due to arcing. (See Fig. 1). Fig. 1 COM N.C. N.O. Load COM N.C. N.O. Load Load separation Load |
Similar Part No. - NR-HLD-42 |
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Similar Description - NR-HLD-42 |
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