All contacts should be periodically cleaned . A
contact burnisher S#182 A836H01 is recommended
for this purpose. The use of abrasive material for
cleaning contacts is not recommended because of
the danger of embedding small particles in the face
of the soft silver and thus impairing the contact.
Cal ibratio.l
Use the following procedure for calibrating the
relay if the relay has been taken apart for repairs
or the adjustments have been disturbed.
This
procedure should not be used unless it is apparent
that the relay is not in proper working order. (See
" Acceptance Check").
Overvoltage Unit
(V)
1. The upper pin bearing should be screwed down
until there is approximately 1/64'' clearance
between it and the top of the shaft bearing. The
upper pin bearing should then be securely locked
in position with the lock nut. The lower bearing
position is fixed and cannot be adjusted.
2.
The contact gap adjustment for the overvoltage
unit is made with the moving contact in the
reset position, i.e., against the right side of
the bridge. Advance the tight hand stationary
contact until the contacts make. Then advance
the stationary contact and additional
Vi
turn.
Optimum adjustment occurs when the moving
contact arm comes to rest just away from the
molded bridge.
Now move in the left-hand stationary contact
until it just touches the moving contact. Then
back off the stationary contact 2/3 of one turn
for a contact gap of approximately . 020".
The
clamp
holding
the
stationary
contact
housing need not be loosened for the adjust
ment since the clamp utilizes a spring-type
action in holding the stationary contact in
position.
With the resistor shorted out, pass 15 volts a-c
through the relay terminals.
The sensitivity adjustment is made by varying
the tension of the spiral spring attached to the
moving element assembly. The spring is ad
justed by placing a screwdriver or similar tool
into one of the notches located on the periphery
of the spring adjuster and rotating it. The
spring adjuster is located on the underside of
I.L. 41-933.18
the bridge and is held in place by a spring
type clamp that does not have to be loosened
prior to making the necessary adjustments.
Adjust the spring until the moving contact just
makes with the left hand stationary contact. With
this adjustment, the dropout of the relay is
approximately 98% of the pickup value.
The adjustable clamp on the resistor can be
set for any pickup to 45 volts, for the 15 to 45
volt unit, or for the 108 to 132 volt unit, it can
be set for a voltage between
108
and 132 volts.
Indicating Contactor Switch (ICS)
Adjust the contact gap for approximately 5/64"
( -1/64"'
+
0).
Close the main relay contacts and check to see
that the relay picks up and the target drops between
1 and 1.2 amperes d-e.
R ENEWAL PARTS
Repair work can be done most satisfactorily at the
factory. However, interchangeable parts can be
furnished to the customers who are equipped for
doing repair work.
When ordering parts awlays
give the complete nameplate data.
RATINGS
(60
CYCLE)
RELAY
POWER
VOLTAGE APPLIED BURDEN
FACTOR
SETTING
VOLTAGE VOL T-AMPS ANGLE
LAGGING
15
15
.25
28
°
15-45
15
120
.20
4
8
°
Volt
Units
45
45
.75
go
45
120
5.4
100
108
108
2.23
3.
7
°
108-132
Volt
108
120
1.25
3.
7
°
Units
132
132
1.55
30
The type KV-1 overvoltage relay has a continuous
rating of 120 V.A.C., and
208
V..A.C. for 30 seconds.
3
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