2-9
TI545/TI555 System Manual
Pre-installation Guidelines
2.6
Correcting Noise Problems
When potential noise problem sources are identified, two general methods
are available to handle them. These methods are described in the following
sections.
•
Noise snubbing.
•
Noise isolation.
These methods are described in the following sections.
Noise snubbing reduces noise at its source. Applicable only to devices driven
by mechanical contacts, snubbing suppresses arcing at electrical contacts
caused by turnoff of inductive loads (e.g., relays, motors, motor starters,
solenoids, etc.).
Load snubbing (shown in Figure 2-5) reduces voltage transients at the load,
preventing them from traveling back to the contacts where they would
produce a showering arc and couple with adjacent wiring.
Discrete
input
Load
C
R
Discrete input
module protection
RC snubbing
Input Power
Discrete
input
Load
Discrete input
module protection
MOV snubbing
MOV
Input Power
Figure 2-5
Load Noise Snubbing
Noise Snubbing
