1. System Installation Requirements
1-24
TI 32P01J10-01EN
Examples of Spark-killer and Diode Installation
The following shows how to install a spark-killer and a diode as a countermeasure against
inductive
load-caused noise:
Power supply
F010503.ai
Example
R: 120 ohms
C: 0.1 to 0.3 μF
Example
R: 120 ohms
C: 0.1 μF
Spark
killer
100 V AC
Fluorescent
lamp or fan
The spark killer prevents noise-
caused equipment failure when
a fluorescent lamp or fan is
turned on or off.
The spark killer protects relay
contacts from noise occurring when
inductive loads working under AC
operation are turned off.
Relay contact for N-IO
ProSafe-RS
Relay
Output
Module
24 V DC
Spark
killer
Controller
control signal
Tr
Diode (*1)
Relay
*1: The diode protects the output transistor from noise occurring during
on-to-off transition of the relay.
*2: S2MMM843 or S2MDV843 of style S2 or later has a built-in diode,
so this diode is not required.
Example
R: 120 ohms
C: 0.1 to 0.3 μF
The spark killer protects relay
contacts from noise occurring when
inductive loads working under AC
operation are turned off.
Relay contact
for FIO
Relay
Output
Module
24 V DC
Spark
killer
Controller
control signal
Tr
Diode (*1)
Relay
*1: The diode, which protects the output transistor from noise occurring during
on-to-off transition of the relay, is incorporated in the output module except SDV526.
(*2)
Figure Examples of Spark-killer Installation
Mar. 29, 2019-00