1 - 13 1 - 13
MELSEC-Q
1 GENERAL SPECIFICATIONS AND PRECAUTIONS FOR USE
Circuit example Method for selecting elements Remarks
Capacitor +
Resistor
method (CR
method)
Refer to the following for
constants of the capacitor and
resistor. Note that the following
values may differ depending
on a nature of the load and a
variation of characteristics of it.
• Capacitor: 0.5 to 1 ( F)
against load current of 1A
• Resistor: 0.5 to 1(Ω) against
power supply voltage of 1V
Use a capacitor whose
withstand voltage is equal to or
more than the rated voltage.
Use a capacitor having no
polarity.
If a load is a relay or
solenoid, the recovery time
delays.
(d) Measures for connecting an inductive load (when installing a contact between
the load and the output terminal)
To install a contact (such as an interlock) between the load and the output
terminal, take measures to reduce noise as shown below.
Though measures (varistor method, capacitor + resistor method) are normally
taken to the load side, in some cases, it is more efficient to take the measures to
the module side considering the contact effect.
Circuit example Method for selecting elements Remarks
Varistor method • Measure taken to the load side
• Measure taken to the module side
Select a cut voltage (Vc) for
the varistor to meet the
following condition.
• Vc > Power supply voltage
1.5(V) √2
This method is not effective
when the Vc is too high.
The recovery time delays
slightly.
To Next Page
Loading...
Need help?
General
