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Reference:By the condition of load, CR circuit may be better to install in the contact side but
it is required to put in by checking the action of load.
ＳＫ : Surge absorption filter
−How to think alarm contacts against inductive load−
When use the inductive load for alarm contacts, the very high reverse electromotive
voltage may be generated and the following trouble tends to be produced.)
・Contact part of relay is melted adhesively and the contacts can no work.
・High voltage is put inside of indicator/alarm unit and then, electrical parts may be damaged.
・As it is big noise, the trouble action may be taken by the reckless drive of CPU.
※
As the inductive load, there are following samples.
・Patlight * External relay * Buzzer *Siren *Fan *Fluorescent lamp * Motor etc.
CAUTION
・
The inductive load shall not be used in principle(Do not use fluorescent lamp).
・
When use the inductive load, make the contact amplification outside, but the outside
relay coil belongs to the inductive load, use the relay driven by the low voltage(within
AC100V) and it is protected by an appropriate surge killer.
・
When control the light inductive load directly, protect the contacts by an appropriate surge
killer by all means.
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SK
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SK
C
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Power supply
Power supply
Relay
(Low pressure
relay)
Alarm contact
