S&C CS-1A Manual

S&C Instruction Sheet 719-501 19
Inspection and Maintenance
Recommended Exercising Procedure for
Superseded-Design Switch Operators
(catalog numbers 38846 through 38846R3, equipped
with optional shunt-trip solenoid switch and redun-
dant relay [catalog number sufx “-HP”])
With these superseded-design switch operators, a
shunt-trip solenoid switch (94) and redundant relay (62)
are used to minimize control-current inrush by energiz-
ing the shunt-trip device and switch-operator motor in
sequence. The redundant relay provides a backup function,
ensuring circuit-switcher actuation independent of shunt-
trip operation.
To verify their proper functioning, S&C recommends
the shunt-trip solenoid switch and redundant relay each
be exercised separately (preferably through the protective-
relay circuit to check out the external control wiring as
well) while the other component is temporarily disabled.
The following annual exercising procedure is
recommended.
Note: The wire and terminal designations referenced apply
to the standard wiring diagrams for superseded models
CDR-3116R3-1 and CDR-3116R3-2 and may differ on special
wiring diagrams.
To exercise the shunt-trip solenoid (94) switch:
STEP 1� Open the control-source disconnect switch
and then place the switch-operator selector
handle in the Decoupled position. (When the
switch operator is thus decoupled, the shunt-trip
solenoids at the circuit-switcher pole-units are
rendered inoperative.)
STEP 2� Disable the opening contactor (OC) by removing
wires numbered 8C and 8D from the OC coil
terminal C7. This will allow the Opening opera-
tion of the switch operator to be totally controlled
by the contacts of the solenoid (94) switch.
STEP 3� Close the control-source disconnect switch
and energize the solenoid (94) switch (to move
the switch operator to the Open position) by a
simulated Shunt Trip operation. Return the
switch operator to the Closed position using
the pushbutton control. Repeat four times for
exercising purposes.
STEP 4� Open the control-source disconnect switch and
reconnect wires numbered 8C and 8D to the OC
coil terminal C7.
To exercise the redundant (62) relay:
STEP 1� Make sure the control-source disconnect switch
is opened and the switch-operator selector
handle is in the Decoupled position.
STEP 2� Disable the solenoid (94) switch by removing wire
number 2I from terminal L1 on the redundant
(62) relay. This will allow an Opening opera-
tion of the switch operator to be initiated by the
contacts of the redundant (62) relay.
STEP 3� Close the control-source disconnect switch and
energize the redundant (62) relay (to move the
switch operator to the Open position) by a simu-
lated Shunt Trip operation. Energization should
be for a duration of more than ¼-second to allow
time for closing of the (62) relay contact. Return
the switch operator to the Closed position using
the pushbutton control. Repeat four times for
exercising purposes.
STEP 4� Open the control-source disconnect switch and
reconnect wire number 2I to the redundant (62)
relay terminal L1.
STEP 5� To return the switch operator to service, bring
the switch operator to the same position as the
circuit-switcher. Place the selector handle in the
Coupled position and close the control-source
disconnect switch.

S&C CS-1A Specifications

General

Brand	S&C
Model	CS-1A
Category	Switch
Language	English