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MG-6 Multi-Contact Auxiliary Relay
5.0 INstALLAtION
MG-6 relays should be mounted on switchboard
panels or their equivalent in locations free from dirt,
dust, moisture, excessive vibration and heat. Relays
should be mounted vertically by means of their
respective mounting hardware, as shown in Figures
7 to 11.
The electrical connections may be made directly to
the relay terminals by means of screws provided.
Relay grounding can be accomplished by using a
mounting screw, or in the case of the front connected
with cover (Figure 10), a lug is provided adjacent to
the upper mounting hole for device grounding.
6.0 ADjustMeNts & MAINteNANCe
The proper adjustments to insure correct operation
of the relay have been made at the factory and the
relay should not require adjustment after receipt
by the customer. If any of the adjustments or the
contact configuration has been changed or the relay
is disassembled, the instructions below should be
followed.
The relay should be mounted in a normal vertical
operating position for all of these checks. Refer to
Figures 1 & 2, and Section 2.0 CONSTRUCTION
& OPERATION, for part identification and contact
information.
6.1 ACCeptANCe CheCK
The following checks are recommended to ensure
that the relay is in proper working order.
Pickup
– 80% of rating
Make contacts – Operate simultaneously
Break contacts – Operate simultaneously
6.2 ARMAtuRe
6.2.1 Armature stop Adjustment Nut
The armature stop adjustment nut should be set to
3/8" with the armature held against the electromagnet.
For those relays having a coil cutoff contact, the
measurement should be 7/16". The flat on the nut
should be parallel with the armature. The hole in the
armature must not touch the stop nut stud for either
the extreme right or the extreme left position of the
armature in its bearings. Adjust the position of the coil
should the stud be touching either side.
ABB
6.2.2 Armature spring
preliminary Adjustments
When adjusting the armature spring tension, the
locking screw for the spring adjusting screw is
loosened and this adjusting screw is turned (inward
to reduce spring tension) until the spring barely holds
the armature against the stop nut. The relay must be
in its normal vertical position when this adjustment is
made with all contacts assembled as circuit closing.
The armature spring should then be tightened by
turning the adjusting screw 4 turns counterclockwise
for ac relays or 2 turns for dc relays, and the locking
screws should be tightened.
6.2.3 Armature spring
Final Adjustments
If the relay is ac operated and has less than 6 break
contacts, turn the spring adjuster counterclockwise
4 turns. If the relay is dc operated and has less
than 4 break contacts, turn the spring adjuster
counterclockwise 2 turns. For dc relays with 4 or more
break contacts or ac relays with 6 break contacts, turn
the spring adjuster counterclockwise only enough
for the armature to hit the stop nut. Tighten locking
screw on non-latching relays. See section 6.5 LATCH
ASSEMBLIES, for information on latching relays.
6.3 MOVING CONtACt FINGeRs
When a moving contact finger has been removed
from its guide pin and is to be reassembled, the coil
springs on either side of the finger must be replaced
correctly. Select the stronger spring and place it on
the closing side of the contact finger. The stronger
spring can be determined by placing the two springs
on a flat surface and compressing them. Pick the
stronger of the two.
6.4 CONtACts
6.4.1 Contact Follow
The follow of the moving contact fingers should be
3/32" for the make contacts and 1/16" for the break
contacts, measured at the contacts. This can be
checked more conveniently by measuring the travel
of the lower edge of the armature after the contacts
touch. This should be approximately 1/8" for the make
contacts and 3/32" for the break contacts. In case
moving contact fingers have been removed from
their guide pins, it is important that the coil springs
on the two sides of the fingers be replaced correctly.
The springs which are compressed by circuit-closing
IL 41-753.1 N
7
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