TYPE HQS RELAY
.lc
and the filter are
shown in the
Carrier
Current Schematic for selective pole tripping
supplied with each terminal.
ADJUSTMENTS AND MAINTENANCE
The proper adjustments to insure correct
operation of this relay have been made at the
factory and should not be disturbed after re
ceipt by the customer.
If the adjustments
have been changed, the relay taken apart for
repairs, or if it is
desired to check the
adjustments
at regular maintenance periods,
the instructions below should be followed.
All contacts should be periodically cleaned
with a fine file. S#l002110 file is recom
mended for this purpose. The use of abrasive
material for cleaning contacts is not recom
mended,
because of the danger of embedding
small particles in the face of the soft silver
and thus impairing the contact.
Phase Selector Element
Check the free movement of each element with
the relay in a vertical position to see that
it
is free from friction and properly center
ed.
The
loop should assume a vertical po
sition with the contacts open when the element
is completely deenergized.
With the loop in the neutral position de
termined
by
gravity,
adjust both left-hand
stationary contacts (front view) so that there
is contact gap of .01011 between moving contact
bridge and the stationary contacts.
Adjust
the left hand back stop screws for .01011
con
tact deflection. Adjust the left stop which
strikes against the loop so that it makes con
tact against the loop at the same time the
moving contact deflects the stationary contact
against the two back screws.
Repeat these ad
justments for the right hand contacts
and
stops.
Connect terminals 25 and 24 together and
pass 1 ampere, 60 cycles, from terminals 26 to
23.
(This test is without the filter).
The
moving
should
contact of the bottom
element
move to the right and bridge
(sc)
the
stationary contacts.
Reverse the connections
to terminals 25
and 26. The left-hand con
tacts
should now remain firmly closed. Raise
the
current to 15 amperes and make sure
that
the
loop stop screws have the adjustment for
minimum
contact vibration.
This
current
should
be
passed only momentarily to prevent
overheating the fault detector coils.
Repeat the tests on the middle element (SB)
by connecting terminals 22 and 25 together and
passing current through terminals 21 and 26
and on the top element
(SA) by connecting
terminals 25 and 22 together and passing cur
rent through terminals 19 and 26.
Adjust the bearing screws of the moving loop
so that there is about .010 inch end play.
See that the loop does not bind or strike
against the iron or coil when pressed against
either end jewel.
Contactor Switch
Adjust the
a clearance
the
moving
picked up.
stationary c·ore of the switch for
between the stationary core and
core of 1/64" when the switch is
This can be done by turning the
relay up-side-down or by disconnecting
the
switch and turning it up-side-down.
Then
screw up the core screw until the moving core
starts rotating. Now, back off the core screw
until the moving core stops rotating. This
indicates the points where the play in the
assembly is taken up,
and where the moving
core just separates from the stationary core
screw.
Back off the core screw approximately
one turn and lock in place. This prevents the
moving core from striking and sticking to the
stationary core because of residual magnetism.
Adjust the contact clearance for 3/32"
by
means
of the two small nuts on either side of
the
Micarta disc.
The switch should pick up
at 4 amperes d-e.
Test for sticking after 30
amperes d-e have been passed through the coil.
The coil resistance is approximately .025 ohms.
Operation Indicator
Adjust the indicator to operate at 1.0
ampere d-e. gradually applied by loosening the
two screws on the under side of the assembly,
and moving the bracket forward or backward.
5
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