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6
Suppression of RF noise
1070 080 067-101 (2001.03) GB
PSI 6XXX.350 L1
Means of noise suppression are required to prevent radiation of radio frequency noise.
Such noise is caused by transients peaks, which are transmitted by the power supply line.
Noise should be neutralized at the source. If this is not practical, the noise suppression
devices must be placed as close as possible to the source.
All inductive devices such as valves, solenoids and other switching elements (or their
connecting wires), which are situated in the vicinity of the timer require noise suppres-
sion.
Because of inherent vibrations of the machine, the mounting of all noise suppression de-
vices must be resistant to fracture.
DIODE
+
Diode, suitable for small DC relays
DIODE AND ZENER DIODE
+
DI-ZD attenuation element for large DC
contactors and defined drop-out times
Figure 6: Examples of noise suppression
Voltage
24 VDC
48 VDC
110 VAC
220 VAC
440 VAC
This table serves only as an example. The actual component values depend on the spe-
cific load conditions.
GND
GND
Resistor
Capacitor
-
-
220 Ω/1 W
0.5 µF 400/600 V
220 Ω/5 W
0.1 µF 500 V
220 Ω/5 W
0.1 µF 1000 V
Suppression of RF noise
RC ELEMENT
∼
RC element for AC relays and AC
motors
RC ELEMENT
RC element for spark quenching of in-
ductive loads
-
1 N 5060/ZL 12
-
1 N 5060/ZL 22
MP
Diode
6-1
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