S&C CS-1A User manual

November 13, 2023
© S&C Electric Company 1978-2023, all rights reserved Instruction Sheet 719-501
S&C Type CS-1A Switch Operator★
Outdoor Transmission
Operation
Table of Contents
Introduction � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 2
Qualified Persons � � � � � � � � � � � � � � � � � � � � � � � � � � � 2
Read this Instruction Sheet � � � � � � � � � � � � � � � � � � � 2
Retain this Instruction Sheet� � � � � � � � � � � � � � � � � � � 2
Proper Application � � � � � � � � � � � � � � � � � � � � � � � � � � 2
Warranty � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 3
Safety Information� � � � � � � � � � � � � � � � � � � � � � � � 4
Understanding Safety-Alert Messages� � � � � � � � � � � 4
Following Safety Instructions � � � � � � � � � � � � � � � � � � 4
Replacement Instructions andLabels � � � � � � � � � � � 4
Location of Safety Labels � � � � � � � � � � � � � � � � � � � � � 5
Safety Precautions � � � � � � � � � � � � � � � � � � � � � � � 6
Overview � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 7
Operation � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 10
Electrical Operation � � � � � � � � � � � � � � � � � � � � � � � � �11
Manual Operation � � � � � � � � � � � � � � � � � � � � � � � � � �12
Post Operating Inspection � � � � � � � � � � � � � � � � � � � �13
Restoring the Switch Operator and Circuit-
Switcher to Normal Operation � � � � � � � � � � � � � � �13
Using the Selector Handle (Coupling and
Decoupling) � � � � � � � � � � � � � � � � � � � � � � � � � � � � �14
Inspection and Maintenance � � � � � � � � � � � � � � 16
Elective Exercising � � � � � � � � � � � � � � � � � � � � � � � � � �16
Brake Inspection� � � � � � � � � � � � � � � � � � � � � � � � � � � �16
Recommended Exercising Procedure for
Superseded-Design Switch Operators � � � � � � � �19
★ For use with the Mark V Circuit-Switcher

2 S&C Instruction Sheet 719-500
WARNING
Only qualified persons who are knowledgeable in the installation, operation, and maintenance
of overhead and underground electric distribution and transmission equipment, along with
all associated hazards, may install, operate, and maintain the equipment covered by this
publication� A qualified person is someone who is trained and competent in:
• The skills and techniques necessary to distinguish exposed live parts from nonlive parts
of electrical equipment
• The skills and techniques necessary to determine the proper approach distances
corresponding to the voltages to which the qualified person will be exposed
• The proper use of special precautionary techniques, personal protective equipment, insulated
and shielding materials, and insulated tools for working on or near exposed energized parts
of electrical equipment
These instructions are intended only for such qualified persons� They are not intended to be a
substitute for adequate training and experience in safety procedures for this type ofequipment�
NOTICE
Thoroughly and carefully read this instruction sheet and all materials included in the product’s
instruction handbook before installing or operating the Type CS-1A Switch Operator� Become
familiar with the Safety Information and Safety Precautions on pages 3 through 5� The latest
version of this publication is available online in PDF format at https://www�sandc�com/en/
contact-us/product-literature/�
This instruction sheet is a permanent part of the Type CS-1A Switch Operator. Designate a location
where users can easily retrieve and refer to this publication.
WARNING
The equipment in this publication is only intended for power operation of the S&C Mark V
Circuit-Switcher� The application must be within the ratings furnished for the equipment� Ratings
and application information for the Type CS-1A Switch Operator are listed in the ratings table
in Specification Bulletin 719-31� The ratings are also on the nameplate affixed to the product�
Qualified
Persons
Read this
Instruction
Sheet
Retain this
Instruction
Sheet
Proper
Application
Introduction

S&C Instruction Sheet 719-500 3
Introduction
The warranty and/or obligations described in S&C’s Price Sheet 150, “Standard Conditions of
Sale–Immediate Purchasers in the United States,” (or Price Sheet 153, “Standard Conditions of
Sale–Immediate Purchasers Outside the United States”), plus any special warranty provisions, as
set forth in the applicable product-line specication bulletin, are exclusive. The remedies provided
in the former for breach of these warranties shall constitute the immediate purchaser’s or end
user’s exclusive remedy and a fulllment of the seller’s entire liability. In no event shall the seller’s
liability to the immediate purchaser or end user exceed the price of the specic product that gives
rise to the immediate purchaser’s or end user’s claim. All other warranties, whether express or
implied or arising by operation of law, course of dealing, usage of trade or otherwise, are excluded.
The only warranties are those stated in Price Sheet 150 (or Price Sheet 153), and THERE ARE NO
EXPRESS OR IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR
PURPOSE. ANY EXPRESS WARRANTY OR OTHER OBLIGATION PROVIDED IN PRICE SHEET
150 (OR PRICE SHEET 153) IS GRANTED ONLY TO THE IMMEDIATE PURCHASER AND END
USER, AS DEFINED THEREIN. OTHER THAN AN END USER, NO REMOTE PURCHASER
MAY RELY ON ANY AFFIRMATION OF FACT OR PROMISE THAT RELATES TO THE GOODS
DESCRIBED HEREIN, ANY DESCRIPTION THAT RELATES TO THE GOODS, OR ANY REMEDIAL
PROMISE INCLUDED IN PRICE SHEET 150 (OR PRICE SHEET 153).
Warranty

4 S&C Instruction Sheet 719-500
Safety InformationSafety Information
Several types of safety-alert messages may appear throughout this instruction sheet and on
labels and tags attached to the Type CS-1A Switch Operator. Become familiar with these types
of messages and the importance of these signal words:
DANGER
“DANGER” identifies the most serious and immediate hazards that will likely result in serious
personal injury or death if instructions, including recommended precautions, are not followed�
WARNING
“WARNING” identifies hazards or unsafe practices that can result in serious personal injury
or death if instructions, including recommended precautions, are not followed�
CAUTION
“CAUTION” identifies hazards or unsafe practices that can result in minor personal injury if
instructions, including recommended precautions, are not followed�
NOTICE
“NOTICE” identifies important procedures or requirements that can result in product or property
damage if instructions are not followed�
If any portion of this instruction sheet is unclear and assistance is needed, contact the nearest
S&C Sales Ofce or S&C Authorized Distributor. Their telephone numbers are listed on S&C’s
website sandc.com, or call the S&C Global Support and Monitoring Center at 1-888-762-1100.
NOTICE
Read this instruction sheet thoroughly and carefully before operating
the Type CS-1A Switch Operator�
If additional copies of this instruction sheet are required, contact the nearest S&C Sales Ofce,
S&C Authorized Distributor, S&C Headquarters, or S&C Electric Canada Ltd.
It is important that any missing, damaged, or faded labels on the equipment be replaced
immediately. Replacement labels are available by contacting the nearest S&C Sales Office, S&C
Authorized Distributor, S&C Headquarters, or S&C Electric Canada Ltd.
Understanding
Safety-Alert
Messages
Following
Safety
Instructions
Replacement
Instructions
andLabels

S&C Instruction Sheet 719-500 5
Safety Information
Reorder Information for Safety Labels
Location Safety Alert Message Description Part Number
ACAUTION Use pushbuttons to open or close the circuit-switcher���� G-4527R3
BNOTICE The S&C Instruction Sheet is a permanent part of your S&C Equipment���� G-3733R2
CNOTICE Auxiliary switch cams are individually adjustable� Check the auxiliary switch cams��� G-4746R2
DNOTICE This contactor or relay has been blocked to prevent damage during shipment� G-3684●
●One removable label per contactor or relay� Remove before operation�
Location of Safety Labels
A
D
C
B

6 S&C Instruction Sheet 719-501
Safety Precautions
DANGER
Mark V Circuit-Switchers operate at high voltage� Failure to observe the
precautions below will result in serious personal injury or death�
Some of these precautions may differ from company operating procedures and rules�
Where a discrepancy exists, follow your company’s operating procedures and rules�
1� QUALIFIED PERSONS� Access to Mark V Circuit-
Switchers must be restricted only to qualified
persons� See the “Qualified Persons” section on
page 2�
2� SAFETY PROCEDURES� Always follow safe
operating procedures and rules�
3� PERSONAL PROTECTIVE EQUIPMENT� Always
use suitable protective equipment, such as rubber
gloves, rubber mats, hard hats, safety glasses, and
flash clothing, in accordance with safe operating
procedures and rules�
4� SAFETY LABELS� Do not remove or obscure any of
the “DANGER,” “WARNING,” “CAUTION,” or
“NOTICE” labels�
5� OPERATING MECHANISM AND BASE� Mark V
Circuit-Switchers contain fast-moving parts that
can severely injure fingers� Do not remove or
disassemble operating mechanisms or remove
access panels unless directed by S&C Electric
Company�
6� ENERGIZED COMPONENTS� Always consider all
parts of the circuit-switcher live until de-energized,
tested, and grounded� Voltage levels can be as high
as the peak line-to-ground voltage last applied to
the unit� Units that have been energized or installed
near energized lines should be considered live until
tested and grounded�
7� GROUNDING� The Mark V Circuit-Switcher must
be connected to a suitable earth ground at the base
of the utility pole, or to a suitable building ground
for testing, before energizing the switch and at all
times when energized� The vertical operating shaft
above the Type CS-1A Switch Operator must also
be connected to a suitable earth ground�
The ground wire(s) must be bonded to the system
neutral, if present� If the system neutral is not
present, proper precautions must be taken to ensure
the local earth ground, or building ground, cannot
be severed or removed�
8� SWITCH POSITION� Always confirm the Open/
Close position of each switch�
• Switches and terminal pads may be energized
from either side�
• Switches and terminal pads may be energized
with the switches in any position�
9� MAINTAINING PROPER CLEARANCE� Always
maintain proper clearance from energized
components�

S&C Instruction Sheet 719-501 7
Overview
The Type CS-1A Switch Operator is a high-speed operator
having an operating time of 1.5 seconds maximum. It
is expressly designed for power operation of MarkV
Circuit-Switchers.
High-speed, high-torque power operation of Mark V
Circuit-Switchers, by means of the Type CS-1A Switch
Operator, is essential to attain the two-time duty-cycle
fault-closing ratings of 30,000 amperes RMS three-phase
symmetrical, 76,500 amperes peak for vertical-break
style and integer-style models; and two-time duty-cycle
fault-closing ratings of 40,000 amperes RMS three-phase
symmetrical, 102,000 amperes peak for center-break style
models.
Power operation also provides opening and closing
without hesitation under ¾-inch (19-mm) ice formation
for vertical-break style and integer-style models, 1½-inch
(38-mm) ice formation for center-break style models; close
interphase simultaneity; long life of fault-closing contacts
under normal operating duties; and avoidance of exces-
sive switching transients due to prolonged or unstable
prestrike arcing.
Because of its high-speed operation, the Type CS-1A
Switch Operator is not suitable for use with switches of
other manufacture.
Before operating the Type CS-1A Switch Operator,
become familiar with the parts of the switch operator
and Mark V Circuit-Switcher, as shown in Figures 1 and
2 on pages 7 and 8.

8 S&C Instruction Sheet 719-501
Overview
Circuit-switcher
position indicator
Manual operating
handle
Latch
knob Selector
handle
Door handle
Figure 1� A 69-kV integer-style Mark V Circuit-Switcher connected to a Type CS-1A Switch Operator�
Pushbutton
protective cover
Interrupter targets

S&C Instruction Sheet 719-501 9
Overview
Key interlock with switch
(catalog number suffix “-L”)
Operation counter
Position indexing
drums
Arrow plate
Motor circuit
fuseholder
Duplex receptacle and
lampholder with switch
Filter holder
Instruction book
holder
Space heater fuseholder
Shunt-trip
fuseholder
Door gasket
Figure 2� An interior view of a Type CS-1A Switch Operator with the door open�
Position indicating
lamps

10 S&C Instruction Sheet 719-501
Operation
The following operating instructions assume the
switch-operator output shaft has been connected to the
circuit-switcher power train, the electrical connections to
the control source have been completed, and the switch
operator has been correctly adjusted in accordance with
S&C Instruction Sheet 719-500, “S&C Type CS-1A Switch
Operators: Installation.” Figure 1 on page 7 illustrates a
Type CS-1A Switch Operator connected to an integer-style
Mark V Circuit-Switcher.
Do not assume the switch-operator position necessarily
indicates the Open or Closed position of the circuit-
switcher. Upon completion of an Opening or Closing
operation (electrical or manual), make sure the following
conditions exist:
• The switch-operator position indicator displays “Open”
or “Closed” to indicate the switch operator has moved
through a complete operation. See Figure 1 on page 7.
Also, if furnished, note the position-indicating lamps.
See Figure 2 on page 8.
• The circuit-switcher position indicator, located on the
switch-operator output shaft, is in agreement with the
switch-operator position indicator. See Figure 1. Both
indicators should show “Open” or “Closed.”
• The circuit-switcher disconnect blade on each pole-unit
is fully open or fully closed.
Then, tag and padlock the switch operator in accor-
dance with standard system operating procedures. In all
cases, make sure the switch operator is padlocked before
“walking away.”
Correct operation of the circuit-switcher depends on
charging and latching the stored-energy source within
each brain as the disconnect blades move to the fully Open
position and the interrupters close. The interrupter target
located on the side of each brain housing appears yellow
when the interrupter is open. The target appears gray
(normal) when the interrupter is closed.
Because the interrupters are closed as the circuit-
switcher blades move to the fully Open position, the target
appears yellow only briefly during the Opening operation.
The target should never appear yellow when the circuit-
switcher is in the fully Open or fully Closed position. See
Figure 1 on page 7 and Figure 3.
Figure 3� The interrupter target�
Yellow
(open)
Gray
(closed)

S&C Instruction Sheet 719-501 11
Operation
Electrical Operation
To open or close the circuit-switcher electrically:
STEP 1� Unlock and lift the external pushbutton protec-
tive cover. See Figure 4.
STEP 2� Press the appropriate pushbutton.
Note: The switch operator may be activated by operating
associated, remotely located control switches. (No instruc-
tions are included for activating the switch operator by
means of remotely located control switches because control
schemes vary with different installations. With any given
installation, however, it may be possible and desirable
to effect such operation. Instructions presented in this
document cover operation at the switch operator only.)
Note: For switch operators with an optional remote-control
blocking switch (sufx “-Y”), opening the pushbutton protec-
tive cover prevents remote operation of the switch operator.
Note: OPEN/CLOSE pushbuttons are not included on switch
operators specied with catalog number sufx “- J.”
Protective cover
Pushbuttons
Figure 4� The pushbutton protective cover and
pushbuttons�

12 S&C Instruction Sheet 719-501
Operation
Figure 5� Manual operation�
Manual Operation
To open the circuit-switcher manually, follow these steps:
WARNING
Manually closing an energized circuit-switcher is not
recommended because of the possibility of closing into
a fault� Manually opening an energized circuit-switcher
is permissible� When the opening operation has been
initiated, however, it should be completed quickly and
without hesitation� Cranking should continue until the
circuit-switcher is fully open, as indicated by resistance
felt as the circuit-switcher power train progresses to its
stops� As the circuit-switcher moves toward the Open
position, the interrupters will close and the stored-
energy source within the brains will charge and latch�
The circuit-switcher disconnect blades should never
be in the Closed position when the interrupters are
in the Open position� Manually closing the circuit-
switcher may cause arcing, equipment damage,
and personal injury�
STEP 1� Pull the latch knob on the hub of the manual
operating handle and pivot the handle forward
slightly from its Storage position.
STEP 2� Release the latch knob while continuing to pivot
the handle forward to lock it into the Cranking
position. See Figure 1 on page 7 and Figure 5. (As
the handle is pivoted forward, the motor brake is
mechanically released. Both leads of the control
source are automatically disconnected, and both
the “opening” and “closing” motor contactors
are mechanically blocked in the Open position.
However, when the shunt-trip device option is
provided, it remains operative unless the switch
operator is in the Open posit ion .)
STEP 3� Crank the handle in the direction shown on the
arrow plate for the Open position
If desired, during manual operation, the
switch operator may also be disconnected from
the control source by removing the motor-circuit
two-pole pull-out fuseholder, located on the right-
hand inside wall of the enclosure. See Figure 2
on page 8. Likewise, the shunt-trip device may be
rendered inoperative by removing the shunt-trip
circuit two-pole pull-out fuseholder, located on
the left-hand inside wall of the enclosure.
Latch
knob

S&C Instruction Sheet 719-501 13
Operation
STEP 4� To return the manual operating handle to its
Storage position, pull the latch knob and pivot
the handle approximately 90 degrees. The handle
will then be disengaged from the switch operator
and may be rotated freely in either direction to its
Storage position. Complete the handle storage
by pivoting the operating handle backward
approximately 90 degrees until it latches in the
Storage position.
Note: The manual operating handle may be disengaged
from the switch operator mechanism at any position of the
handle. However, if the switch operator and circuit-switcher
are at any position between the fully Open and fully Closed
position when the manual operating handle is placed in
the Storage position, and the motor circuit fuseholder is
inserted, the switch operator will automatically move to
the Open position (because the switch operator control
circuit is designed to allow an electrical closing only from
the fully Open position of circuit-switcher).
Note: The handle may be padlocked in its Storage position.
Post Operating Inspection
Do not assume the switch operator position necessarily indi-
cates the Open or Closed position of the circuit-switcher.
Upon completion of an Opening or Closing operation (elec-
trical or manual), make sure the following conditions exist:
• The switch-operator position indicator displays “Open”
or “Closed” to indicate the switch operator has moved
through a complete operation. See Figure 1 on page 7.
Also, if furnished, note the position-indicating lamps.
See Figure 2 on page 8.
• The circuit-switcher position indicator, located on the
switch-operator output shaft, is in agreement with the
switch-operator position indicator. See Figure 1. Both
indicators should show “Open” or “Closed.”
• The circuit-switcher disconnect blade on each pole-unit
is fully open or fully closed.
Then, tag and padlock the switch operator in accor-
dance with standard system operating procedures. In all
cases, make sure the switch operator is padlocked before
“walking away.”
Correct operation of the circuit-switcher depends on
charging and latching the stored-energy source within
each brain as the disconnect blades move to the fully Open
position and the interrupters close. The interrupter target
located on the side of each brain housing appears yellow
when the interrupter is open. The target appears gray
(normal) when the interrupter is closed.
Because the interrupters are closed as the circuit-
switcher blades move to the fully Open position, the target
appears yellow only briefly during the Opening operation.
The target should never appear yellow when the circuit-
switcher is in the fully Open or fully Closed position
Restoring the Switch Operator and Circuit-
Switcher to Normal Operation
To ensure the switch operator is ready for normal power
operation of the circuit-switcher by remote automatic or
supervisory control, make sure the following conditions
exist:
• The selector handle is in the Coupled position.
• The manual operating handle is in its Storage position.
• The two-pole pull-out fuseholders for the motor, space-
heater, and (if applicable) shunt-trip circuits are inserted.
• The pushbutton protective cover is closed.
• The switch operator is tagged and padlocked in accor-
dance with standard system operating procedures

14 S&C Instruction Sheet 719-501
Operation
Using the Selector Handle (Coupling and
Decoupling)
The integral external selector handle used to operate the
built-in internal decoupling mechanism is located on the
right-hand side of the switch operator enclosure. Become
familiar with the operation of the selector handle, as
described on the switch operator nameplate on the right-
hand side of the enclosure.
To decouple the switch operator from the circuit-
switcher:
STEP 1� Swing the selector handle upright and slowly
rotate it clockwise 50 degrees to the Decoupled
position. See Figure 6. This decouples the switch
operator mechanism from the switch operator
output shaft.
STEP 2� Lower the selector handle to engage the locking
tab. When thus decoupled, the switch operator
may be operated either manually or electrically
without operating the circuit-switcher.
When the selector handle is in the Decoupled
position, the shunt-trip device (when this option
is provided) is rendered inoperative.●Moreover,
in the Decoupled position, the switch opera-
tor’s output shaft is prevented from moving by
a mechanical locking device located within the
switch operator enclosure.
During the intermediate segment of the
selector handle travel, which includes the position
at which actual disengagement (or engagement)
of the internal decoupling mechanism occurs,
the motor-circuit source leads are momen-
tarily disconnected and both the “opening” and
“closing” motor contactors are mechanically
blocked in the Open position. Visual inspec-
tion through the observation window will verify
whether the internal decoupling mechanism is in
the Coupled or Decoupled position. See Figure 8
on page 17. The selector handle may be padlocked
in either position.
●Only the shunt-trip device is rendered inoperative� The switch opera-
tor can still be opened through the user’s protective-relay circuit� As
such, “elective” checkout of the system protective scheme is possible
at any time�
Figure 6� Selector handle operation�
50°
CoupledDecoupled

S&C Instruction Sheet 719-501 15
Operation
Internal decoupling mecha-
nism (coupled)
Figure 7� The internal decoupling mechanism viewed from the observation window�
Internal decoupling mecha-
nism (decoupled)
To couple the switch operator to the circuit-
switcher:
STEP 1� Manually operate the switch operator to bring
it to the same position (Open or Closed) as the
circuit-switcher. The switch operator position
indicator, seen through the observation window,
will show when the approximate Open or Closed
position has been attained.
STEP 2� Turn the manual operating handle slowly until
the position indexing drums are numerically
aligned to move the switch operator to the exact
position for coupling. See Figure 7.
STEP 3� Swing the selector handle upright and rotate
it counterclockwise to the Coupled position.
Lower the handle to engage the locking tab. The
selector handle is now in the Coupled position.
Position indexing drums
Switch operator position
indicators

16 S&C Instruction Sheet 719-501
Inspection and MaintenanceInspection and Maintenance
Elective Exercising
To ensure continued proper performance of the Type
CS-1ASwitch Operator and the associated circuit-
switcher, they should be inspected in accordance with
S&C’s recommended schedule and procedures contained
in S&C Instruction Sheet 711-590.
Electively doing a complete circuit-switcher installa-
tion, including the shunt-trip device, when this option is
furnished, may be accomplished without the need to open
the high-voltage circuit by equipping the circuit-switcher
with the optional stick-operated bypass accessory (catalog
number suffix “-B1” or “-B2”).
Even without the bypass accessory, the Type CS-1A
Switch Operator may be decoupled from the circuit-
switcher, thereby permitting elective exercising of the
operator at any time without requiring an outage or switch-
ing to an alternate source. When the switch operator is
in the Decoupled position, the shunt-trip device, when
furnished, is rendered inoperative, thereby enabling the
system protective scheme to be disabled.
Brake Inspection
As indicated in S&C Instruction Sheet 711-590, “S&C Mark V
Circuit-Switcher: Inspection Recommendations,” the brake
in the Type CS-1A Switch Operator should be inspected
every 2,500 operations or ve years, whichever occurs
more often. The inspection procedure is as follows. See
Figure 8 on page 17.
STEP 1� Place the selector handle in the Decoupled
position.
STEP 2� Remove the two-pole pull-out fuseholders for the
motor, space-heater, and (if applicable) shunt-
trip circuits.
STEP 3� Disconnect the linkage rod by removing the
¼–20 x 1¼-inch hex-head screw, lockwasher, at
washer, and spacer-bushing from the end of the
brake lever, as shown in Detail A in Figure 8 on
page 17. Be careful not to lose these parts. Then,
raise the brake lever and measure the vertical
free play, as shown in Detail B in Figure 8 on
page 17. This dimension should be ⅝-inch (16 mm)
to ¾-inch (19 mm). Should the measurement be
outside this range, brake-wear compensation is
required; proceed to Step 4. If the measurement
is within this range, reattach the linkage rod
and tighten the ¼–20 x 1¼-inch hex-head screw
securely, and proceed to Step 9.
STEP 4� Remove the four  –18 x 1¼-inch screws used to
attach the motor, withdraw the motor, and care-
fully rest its shaft on the oor of the enclosure.
Be careful not to lose the square key or tubular
spacer (if furnished), which may remain on the
motor shaft.
Note: 115-Vac and 230-Vac motors use a
¼–20 socket head-set screw on the side of the
brake disc hub, as shown in Detail C in Figure 8
on page 17. Loosen this set screw approximately
one-half turn using a ⅛-inch Allen wrench before
removing the motor.
STEP 5� Using a  -inch Allen wrench, loosen the pad
assembly socket head-set screw on the side of
the caliper assembly approximately one-half
turn. See Detail A in Figure 8 on page 17.
STEP 6� Using a -inch Allen wrench, rotate the pad
assembly clockwise until the free play at the end
of the brake lever is ⅝-inch (16 mm) to ¾-inch
(19 mm), as shown in Detail B in Figure 8 on
page 17. Now, tighten the  -inch pad assembly
socket-head set screw.
STEP 7� Insert the spacer-bushing through the angle
bracket and brake lever, and reattach the linkage
rod using the ¼–20 x 1¼-inch hex-head screw,
lockwasher, and at washer. Tighten the screw
securely.
STEP 8� Insert the square key in the keyway, as shown in
Detail A in Figure 8 on page 17. Slip the tubular
spacer (if furnished) over the motor shaft and
reinstall the motor. Position the motor so the
two weep holes on the side of the housing face
downward.
STEP 9� Replace the four  –18 x 1¼-inch screws used
to attach the motor and tighten them securely.
On 115-Vac and 230-Vac motors, retighten the
¼–20 socket-head set screw on the side of the
brake disc hub.

S&C Instruction Sheet 719-501 17
Inspection and Maintenance
STEP 10� Check the operation of the brake linkage as
follows:
(a) Pull the latch knob on the hub of the manual
operating handle and slowly pivot the handle
forward from its Storage position toward
its Cranking position until the brake disc
can be rotated by hand. Be careful not to
get grease on the brake disc.
(b) Measure the distance the end of the brake
lever travels from the point of initial
brake release to the bottom of its stroke.
(This occurs when the handle locks into
the Cranking position). This dimension
should be ⅛-inch (3 mm) to ¼-inch (6 mm).
See Detail D in Figure 8 on page 17. If the
measurement is outside this range, contact
the nearest S&C Sales Ofce.
STEP 11� Finally, to check the functioning of the brake,
decouple the operator and then open and close
the operator electrically. After each operation,
check the position of the indicator on the appro-
priate travel-limit disc. It should stop between
indicator plate numbers 2 and 8. See the switch-
operator travel-limit adjustment instructions on
enclosure door. If the indicator on the travel-limit
disc stop is outside this range, contact the nearest
S&C Sales Ofce.

18 S&C Instruction Sheet 719-501
Inspection and Maintenance
Figure 8� Brake inspection procedure�
Motor shaft square key
Brake
disc
 -inch socket-
head recess for
adjusting pad
assembly
Pad
assembly
Caliper assembly
Pad assembly socket-
head set screw
(-inch Allen wrench
required)
Brake
lever
Angle
bracket
 –20 x 1¼-inch
hex-head screw
Spacer bushing
Hub
¼–20-inch socket-head set screw
(⅛-inch Allen wrench required)
DETAIL A
Brake Assembly
DETAIL C
Location of Motor Shaft Set Screw (115
& 230 Vac Operator Only)
 –18 x 1¼-inch
screws
Motor
Operating linkage
disconnected from
brake lever
Brake lever
⅝-inch (16 mm) to ¾-inch
(19 mm) vertical free play
DETAIL B
Measuring Brake Lever Free Play
Operating linkage
connected to brake lever
Point of initial manual brake release
Brake lever
at bottom of its stroke (manual operating handle
in cranking position)
⅛-inch (3-mm) to ¼-inch (6-mm) travel
DETAIL D
Measuring Brake Lever Stroke

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.