F39-EU1E Omron, F39-EU1E Datasheet - Page 103
![F3S-B OPTIONAL PROGRAMMING KIT](/photos/19/83/198337/3762551_sml.jpg)
F39-EU1E
Manufacturer Part Number
F39-EU1E
Description
F3S-B OPTIONAL PROGRAMMING KIT
Manufacturer
Omron
Datasheet
1.F39-EU1E.pdf
(865 pages)
Specifications of F39-EU1E
Leaded Process Compatible
No
Peak Reflow Compatible (260 C)
No
Light Curtain Type
Safety
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
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➌-➀-4 Contact Protection Circuits
Using a contact protection circuit is effective in increasing contact
durability and minimizing the production of carbides and nitric acid.
The following table shows typical examples of contact protection
circuits. Use them as guidelines for circuit design.
Typical Examples of Contact Protection Circuits
Do not use the following types of contact protection circuit.
Note: Although it is thought that switching a DC inductive load is more difficult than a resistive load, an appropriate contact protection circuit can
➌-➀-5 Countermeasures for Surge from External Circuits
Install contact protection circuits, such as surge absorbers, at
locations where there is a possibility of surges exceeding the Relay
withstand voltage due to factors such as lightning. If a voltage
exceeding the Relay withstand voltage value is applied, it will cause
line and insulation deterioration between coils and contacts and
between contacts of the same polarity.
CR
Diode
Diode +
Zener diode
Varistor
Power
supply
achieve almost the same characteristics.
C
Circuit example
Load
*
*
http://www.ia.omron.com/
Power
supply
Power
supply
This circuit arrangement is very effective for diminishing
arcing at the contacts when breaking the circuit. However,
since electrical energy is stored in C (capacitor) when the
contacts are open, the current from C flows into the
contacts when they close. This may lead to contact
welding.
Power
supply
Power
supply
Power
supply
C
R
C
R
Inductive
Inductive
load
load
Inductive
Inductive
Inductive
load
load
load
(Yes)
Yes
Yes
Applicable
AC
No
No
*
current
Yes
Yes
Yes
Yes
Yes
DC
* Load impedance must be much smaller
The release time of the contacts will be
increased if the load is a Relay or
solenoid.
The electromagnetic energy stored in the
inductive load reaches the inductive load
as current via the diode connected in
parallel, and is dissipated as Joule heat
by the resistance of the inductive load.
This type of circuit increases the release
time more than the CR type.
This circuit effectively shortens the
release time in applications where the
release time of a diode circuit is too slow.
This circuit prevents a high voltage from
being applied across the contacts by
using the constant-voltage characteristic
of a varistor. This circuit also somewhat
increases the release time.
Connecting the varistor across the load is
effective when the supply voltage is 24 to
48 V, and across the contacts when the
supply voltage is 100 to 200 V.
than the CR circuit impedance when
using the Relay for an AC voltage.
When the contacts are open, current
flows to the inductive load via CR.
Features and remarks
1. Depending on factors such as the nature of the load and the Relay
2. When a contact protection circuit is used, it may cause the release
Power
supply
characteristics, the effects may not occur at all or adverse effects
may result. Therefore be sure to check operation under the actual
load conditions.
time (breaking time) to be increased. Therefore be sure to check
operation under the actual load conditions.
C
(c)Copyright OMRON Corporation 2007 All Rights Reserved.
Load
This circuit arrangement is very useful for diminishing
arcing at the contacts when breaking the circuit. However,
since the charging current to C flows into the contacts
when they are closed, contact welding may occur.
Use the following as guides for C and R
values:
C: 0.5 to 1 μF per 1 A of contact current (A)
R: 0.5 to 1
These values depend on various factors,
including the load characteristics and
variations in characteristics. Confirm
optimum values experimentally.
Capacitor C suppresses the discharge
when the contacts are opened, while the
resistor R limits the current applied when
the contacts are closed the next time.
Generally, use a capacitor with a
dielectric strength of 200 to 300 V. For
applications in an AC circuit, use an AC
capacitor (with no polarity).
If there is any question about the ability to
cut off arcing of the contacts in
applications with high DC voltages, it may
be more effective to connect the capacitor
and resistor across the contacts, rather
than across the load. Perform testing with
the actual equipment to determine this.
Use a diode having a reverse breakdown
voltage of more than 10 times the circuit
voltage, and a forward current rating
greater than the load current. A diode
having a reverse breakdown voltage two
or three times that of the supply voltage
can be used in an electronic circuit where
the circuit voltage is not particularly high.
The breakdown voltage of the Zener
diode should be about the same as the
supply voltage.
The cutoff voltage Vc must satisfy the
following conditions. For AC, it must be
multiplied by
If Vc is set too high, its effectiveness will
be reduced because it will fail to cut off
high voltages.
Vc > (Supply voltage
Precautions for All Relays
Element selection
per 1 V of contact voltage (V)
2
.
1.5)
C-6
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