RKI Instruments GD-K71D - Manual (Page 17)

PT2E-1052
16
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
C L
SK O SK O
I R
L D
Ｖ Ｖ
Alarm contact
Power supply Relayed relay Power supply
ＧＤ−Ｋ７１Ｄ (Low voltage relay)
−How to think alarm contacts against inductive load−
The spec for alarm contact of GD-K71D is described by the conditions of resistive 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 not work.
・High voltage is put inside of detector 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.
・Irrespective of inductive load, there is the possibility of unforeseeable noise instruction for
contact.
Above trouble may be generated
* 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,
motor, etc.).
・When use the inductive load, make the contact amplification outside, but the
outside relay coil belong, use the relay driven by the low voltage (within AC100V)
and it is protected by an appropriate surge killer.