CS1D-DPL02D Omron, CS1D-DPL02D Datasheet - Page 533

• Manufacturer Part Number: CS1D-DPL02D
• Description: CS1D Dual IO Exp
• Manufacturer: Omron

Specifications of CS1D-DPL02D

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Arc killer circuit examples are listed in the following table.
Note Do not connect a capacitor as an arc killer in parallel with an inductive load as shown in the following dia-
498
Specifications of Basic I/O Units and High-density I/O Units
Using a CR
Using a
diode
Using a
varistor
gram. This arc killer is very effective for preventing spark discharge at the moment when the circuit is
opened. However when the contacts are closed, the contacts may be welded due to the current charged
in the capacitor.
DC inductive loads can be more difficult to switch than resistive loads. If appropriate arc killers are used,
however, DC inductive loads will be as easy to switch as resistive loads.
Circuit
C
R
Yes Yes If the load is a relay or solenoid,
No
Yes Yes The varistor method prevents the
AC DC
Current
Yes The diode connected in parallel with
there is a time lag between the
moment the circuit is opened and
the moment the load is reset.
If the supply voltage is 24 or 48 V,
insert the arc killer in parallel with
the load. If the supply voltage is 100
to 200 V, insert the arc killer
between the contacts.
the load changes energy accumu-
lated by the coil into a current,
which then flows into the coil so that
the current will be converted into
Joule heat by the resistance of the
inductive load. This time lag,
between the moment the circuit is
opened and the moment the load is
reset, caused by this method is
longer than that caused by the CR
method.
imposition of high voltage between
the contacts by using the constant
voltage characteristic of the varistor.
There is time lag between the
moment the circuit is opened and
the moment the load is reset.
If the supply voltage is 24 or 48 V,
insert the varistor in parallel with the
load. If the supply voltage is 100 to
200 V, insert the varistor between
the contacts.
Power
supply
Characteristic
C
The capacitance of the capacitor
must be 1 to 0.5 F per contact cur-
rent of 1 A and resistance of the
resistor must be 0.5 to 1
tact voltage of 1 V. These values,
however, vary with the load and the
characteristics of the relay. Decide
these values from experiments, and
take into consideration that the
capacitance suppresses spark dis-
charge when the contacts are sepa-
rated and the resistance limits the
current that flows into the load when
the circuit is closed again.
The dielectric strength of the capac-
itor must be 200 to 300 V. If the cir-
cuit is an AC circuit, use a capacitor
with no polarity.
The reversed dielectric strength
value of the diode must be at least
10 times as large as the circuit volt-
age value. The forward current of
the diode must be the same as or
larger than the load current.
The reversed dielectric strength
value of the diode may be two to
three times larger than the supply
voltage if the arc killer is applied to
electronic circuits with low circuit
voltages.
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Required element
Appendix A
per con-