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IL 41-753.1 N
Before putting relays into service, remove all
blocking materials which may have been inserted
for the purpose of securing the parts during
shipment. Make sure all moving parts operate
freely. Inspect contacts to see they are clean and
close properly. Operate the relay to check the
settings and electrical connections.
1.0 AppLICAtION
The type MG-6 relay is designed for applications
where several independent circuits may be energized
or de-energized upon operation of a single primary
relay contact or where the capacity of the primary
relay contact is inadequate for the energy required. In
certain applications these relays may be used directly
as primary relays. The stationary contacts can be
reversed so that either circuit opening or circuit closing
service is readily attained. Although recommended, it
is not necessary to predetermine the relay's contact
arrangement. If the relay has a dc operating coil, a
small increase in spring tension may be required. This
will be covered under section 6.0 ADJUSTMENTS &
MAINTENANCE.
In the usual application of the relay, the armature
resets when the operating coil is de-energized.
However, the relays can be supplied with a latching
mechanism that holds the armature in the operate
position until the latch is tripped, either by hand or
electrically.
An operating coil cutoff contact can be supplied with
the electric reset type of relay, where an intermittent
duty coil is required for faster than normal operation
but where the operating coil circuit will be energized
continuously. An operating coil rated at 19% of supply
rating may be applied with a maximum duty of 10,000
operations (ex. 24 volt coil on a 125 volt dc circuit).
2.0 CONstRuCtION & OpeRAtION
MG-6 relays are available in several different case
and cover configurations, providing users a variety of
All possible contingencies which may arise during installation, operation, or maintenance; and all details and
variations of this equipment do not purport to be covered by these instructions. If further information is desired
by purchaser regarding their particular installation or operation and maintenance of the equipment, the local
ABB representative should be contacted.
2
MG-6 Multi-Contact Auxiliary Relay
mounting options as well as a choice of front or rear
terminal connections. All bases and covers are made
of a molded thermo-plastic material, which provides
a tough, insulated enclosure for the relay. MG-6 are
available as follows:
•
Molded Case, semi-flush mount, rear connected.
Smart Style No's MGA...
•
Molded Case, projection mount, rear connected.
Smart Style No's MGB...
•
Molded Case, surface mount, front connected
without cover. Smart Style No's MGC...
•
Molded Case, surface mount, front connected with
cover. Smart Style No's MGF...
•
Flexitest Type FT-22 Case, semi-flush mount, rear
connected. Smart Style No's MGD...
The MG-6 relay is an electromagnetic type solenoid
device with six independent contacts. When the coil is
energized, the armature is attracted to the lamination
stack thereby operating the moving contacts.
Operation is single mode with a make or break
function that can be supplied with either a self or a
latching reset. The duty cycle may be from extremely
intermittent to continuous energization.
MG-6 relays consist of five major assemblies:
1.
Operating electromagnet.
2.
Armature and moving contacts.
3.
Base and stationary contacts.
4.
Latch (optional).
5.
Coil cutoff contact (optional).
2.1 Operating electromagnet
The operating electromagnet located at the lower end
of the relay (as shown in Figure 1) is comprised of
the operate coil (Figure 1, Item 8) and a U-shaped
lamination stack. The coil utilizes one leg of the stack
as its core. This leg is slotted at the outer end to
receive the copper lag loops used to obtain quiet ac
operation. For a dc operated coil, an iron plate, rather
than lag loops, is used to improve performance. The
inner end of the other leg of the stack is shaped so
the armature restraining spring can be attached.
ABB
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