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GEI-74676
Fault Detector Relay Type CHC
c. Advance the stationary contact assembly
until it just touches the moving contact. A
neon lamp connected across terminals 1 and
12 is best suited for this purpose.
d. Tighten the clamping screw so that the
stationary contact is secure.
e. Back off the stop screw until the measured
gap is 0.020 inch between the stationary
and moving contacts.
(It should be noted
that 0.020 inch corresponds to approximately
two-thirds of a turn on the stop screw).
f.
Tighten the locking screw of the moving
contact assembly stop screw in this posi-
tion.
Care should be taken so as not to
disturb the contact adjustment and it should
be noted that the locking screw bears on the
moving contact stop assembly support.
With the connections of Fig. 6 of this supple-
ment, set the current of the cup unit at the mini-
mum pickup value and adjust the control spring as
described
under
SETTINGS,
in
the attached
,. GEK-12 53 to obtain pickup. Replace the rear ball
stop assembly and advance it slightly, making sure
that the moving contact arm does not touch the rear
ball stop assembly when
it
is pushed by hand to close
and wipe in on the stationary contact. Now, change
the current to 1.5 times the minimumjlickup current.
By means of switch S (Fig. 6), apply current suddenly
and observe whether the cup unit contacts bounce
open.
A neon light connected across terminals 1
and 12 is best suited for this purpose.
If
there is
no visible contact bounce, tighten the clamping
screw
to
hold the ball stop assembly in position.
If
the ..
~C'.,tacts
bounce, advance the rear ball stop
PHASE SE()Ut.NCt.
1-2-3 OR 3-2-1
--~-------1
--+--1~-----2
---+--1--........ - - - - 3
assembly carefully until there is no contact bounce
when current is suddenly applied.
Be sure not to
advance the assembly excessively, as it will change
the cup unit pickup.
(The moving contact arm
should touch the rear ball stop assembly after the
front contact closes and wipes in at least 0.005 inch),
To make sure the rear ball stop assembly is not
advanced excessively, reduce the current through
the relay to the minimum pick up value. The relay
should operate to close its contacts at that value.
The pickup of the cup unit may be changed in
the manner described under SETTINGS of PFD in
attached GEK-12 53.
With the
connections of Fig. 6, the
clutch
should be adjusted to slip at approximately 20
amperes. The clutch sUpping point may be changed
by turning the clutch adjusting screw. Turning the
3~rew
clockwise will cause the clutch to slip at a
hlgh~r
value of current.
Be sure to tighten the
lockmg nut, but be careful not to disturb the clutch.
SEAL-IN UNIT AND TARGET UNIT
1.
Mechanical Adjustments Seal-In Unit
a. There should be at least 1/32 inch clearance
between the armature and the pole piece.
b. The normally open contacts should have a
gap of 0.015 inch and the normally closed
contacts should have at least 15 grams
pressure as measured at the contact tip.
The normally open contacts should close
with at least 0.005 inch wipe. The normally
closed contacts should open to a gap of
0.015 inch.
!lQ
2Q
1 3 r P i 6
191
SI
1
I
I.
I
TO
I
1
ONE OR I
I
THREE
DISTANCIi: I
I,
RELAY~
OOTTED
CONN'S.
ARE REQUIRED
FOR PJC31 ,
OPTIONAL
FOR CHC12.
50-FAULT
DETECTOR
TYPE CHe
52-CIRCUIT BREAKER
SI-SEAL-IN
UNIT
Fig. 2 (C)l(:5A6887-(J;
r:rpical External Connections For The
CHC~2A
Relay
4
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