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Nanoline
30
PHOENIX CONTACT
2338_en_O
If sized correctly, these circuit types do not differ greatly in their effectiveness. In principle,
safety equipment should intervene directly at the source of the interference. The following
benefits are provided when a load protective circuit is used:
–
when the contact is open, the load is electrically isolated from the operating voltage.
–
it is not possible for the load to be activated due to undesired operating currents, e.g.,
from RC elements.
–
shutdown voltage peaks cannot be coupled in control lines that run in parallel.
Table 2-1 highlights the advantages and disadvantages of typical relay circuits.
Table 2-1
Circuit versions
Protecting the load
Additional
delay
Defined
induced
voltage
limitation
Bipolar
effective
attenuation
Advantages/disadvantages
Diode Long
Yes
(U
D
)
No
Advantages:
Easy implementation
Cost-effective
Reliable
Non-critical sizing
Low induced voltage
Disadvantages:
Attenuation only via load resistor
Long delay
Series connection diode/Zener
diode
Medium to
short
Yes (U
D
)
No
Advantages:
Non-critical sizing
Disadvantages:
Attenuation only above U
ZD
Suppressor diode
Medium to
short
Yes (U
D
)
Yes
Advantages:
Cost-effective
Non-critical sizing
Limits positive peaks
Suitable for AC voltage
Disadvantages:
Attenuation only above U
ZD
Load
Load
Load
Содержание Nanoline NLC-035-024D-04I-02QRD-05A
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