DEFINITION AND APPLICATION OF ELECTROMECHANICAL RELAY (EMR)
Electromechanical
relays (EMR) are magnetic switches that are driven by electromechanical energy,
NO NC, contacts, DPDT, controls, normally open, normally close.
Many
industrial control applications require relays as control components that are
used as circuit interfaces. Electromechanical relays (EMR) are magnetic
switches that are driven by electromechanical energy. The relay connects the
load circuit ON (closes) or OFF (opens) contacts on electrical and electronic
circuits. Relays generally have one coil (coil) but can have several contacts.
Coils on the relay will become a magnet if electrified.
Contacts
contained in the relay consist of silent (static) contacts and moving contacts.
From the initial position (without electricity) between the silent contact and
the moving contact, there are two contact conditions, namely normally open (NO)
and normally close (NC). Normally open is the condition between silent contact
and moving contact when it is not electrified in an open state (not connected).
Whereas normally close is the situation between the silent contact and the
moving contact when it is not electrified in a closed state (connected). If the
relay is electrified, the contact state will change otherwise, ie NO will be
closed and NC will open.
One
of the most common EMR found on the market is the Omron MK2P-I relay. This
relay has NO 2 contacts (1-3 and 8-6) and 2 NC contacts (1-4 and 8-5). Omron
220V relay diagrams are shown in the figure below.
From
the type of electricity source to activate the coil / coil, the relay is
divided into two namely AC relay (alternating current) and DC relay (direct
current). Omron MK2P-I Relay including DPDT type (Double Pole Double Throw
From
the description above it can be concluded that the relay can be used as an On /
Off circuit or can also be used to change the flow of electric current. The
relay application to turn on the lights alternately is shown in the circuit
below.
When
the button is Off, the EMR does not get electricity so the NO contact opens so
that Lamp1 does not turn on and NC contacts are closed so that the Lamp2 lights
up. When the button is On, the EMR gets electricity so that the NO contact is
closed so that Lamp1 lights up and NC contacts open so that Lamp2 does not turn
on.
The
advantage of using a relay on a circuit is that it can control loads that have
large power by using small power. This small power is only used to activate the
relay coil. In addition, control operators will be safer than large electrical
power due to controls with separate contacts. For the use of loads greater than
the capacity of the relay, you can use Magnetic Contactor.
Hopefully
this article can be useful.
"Don't blame those
who disappoint you, but blame yourself for hoping more for them"
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