Operator’s
Manual
Bypass–Isolation Switches
F–design, 3000 and 4000 amp. sizes
TABLE OF CONTENTS
section-page
INSTALLATION 1-1........................
Mounting 1-1.............................
Power Connections 1-2....................
Engine Starting & Auxiliary Circuits 1-2......
Functional Test 1-5, 1-6, 1–7................
TESTING & SERVICE 2-1..................
Transfer Test 2-1..........................
Preventive Maintenance 2-1................
Disconnecting the Controller 2-1............
Manual Load Transfer 2-2..................
Trouble-Shooting 2-2......................
BYPASSING & ISOLATING 3-1..............
Bypassing the ATS 3-1....................
Isolating the ATS 3-1......................
Return to Service 3-3......................
INDEX back cover.........................
AnexperiencedlicensedelectricianmustinstallATB
7000 Series A T B
Automatic Transfer &
Refer to the outline and wiring drawings provided
with your 7000 Series ATB for all installation and
connection details and accessories.
Refer t o Group 5 Controller User’s Guide 381333–126
for ATS status display messages, time delays, pickup
& dropout settings, and adjustments.
Rating Label
Each 7000 Series ATB contains a rating label to define the
loads and fault circuit withstand/cl o sin g ratings. Refer to the
label on the T ransfer Switch for specific values.
!
Do not exceed the values on the rating label.
Exceeding the rating can cause personal injury
or serious equipment damage.
Nameplate
The Transfer Switch nameplate includes data for each
specific 7000 Series ATB. Use the switch only within the
limits shown on this nameplate. A typical Catalog Number
is shown below with its elements explained:
Catalog Number Identification
Typical 7000 Series ATB catalog no. for overlapping neutral, 3 pole, 4000 amp, 480 V, in Type 1 enclosure:
7ATB C 3 4000 N 5 C
Neutral
A –solid
C – overlapping
blank --- none
ASCO POWER TECHNOLOGIES CANADA PO Box 1238, 17 Airport Road, Brantford, Ontario, Canada N3T 5T3
telephone 519 758–8450, fax 519 758–0876, for service call 1 888 234–2726 (ASCO) www.asco.ca
Phase Poles
2 –singleØ
3 –threeØ
50 Hanover Road, Florham Park, New Jersey 07932–1591 USA
1 800 937–2726 (ASCO), for service call 1 800 800–2726 (ASCO) www.asco.com
Amperes Voltage Controller Enclosure
3000
4000
A 115
B 120
C 208
D 220
E 230
F 240
G 277
H 380
J 400
K 415
L 440
M 460
N 480
P 550
Q 575
R 600
5 –standard
5X – if accesso-
ries ordered
C –type1
F –type3R
G –type4
L –type12
blank – open type
381333–133 A
SECTION 1 INSTALLATION
The ASCO 7000 Series Automatic Transfer & Bypass–
Isolation Switch (ATB) consists of an upper bypass–isolation switch, a transfer switch, a monitoring and transfer
controller, and door–mounted controls. The ATB is
factory wired and tested. Installation requires removal of
the shipping skid then securing the enclosure to the
supporting foundation.
Remove the Transfer Switch
The Transfer Switch is shi pped inside the enclosure (ATS
side) in the fully engaged position. Before installing the
enclosure remove the Transfer Switch as follows:
1. Open the enclosure doors and install the two ramps
(stored on right side).
2. Remove the Isolation Handle which is stored on the
lower right front of the Transfer Switch carriage
frame. Install the Isolation Handle onto the
protruding shaft and turn it counterclockwise
(approximately 10 turns) until it stops
3. Unplug J2 and J5 harness plugs, and roll out the
Transfer Switch. Cover i t to keep it clean.
.
Supporting Foundation
The supporting foundation and adjacent area must be
level and straight, otherwise the Transfer Switch and
enclosure may not align causing door problems. The
floor under the enclosure must be flat and level. This is
very important! The structure of the enclosure must be
straightand square. Allowat least 36 inches for roll out of
Transfer Switch. Refer to the enclosure drawing for
required door opening space.
Mounting
Refer to the enclosure outline drawing furnished with
this switch and mount the 7000 Series ATB according to
the details and instructions shown on the drawing.
Bolt the cubiclesections together so that they are linedup
on the f ront faces. See Figure 1–1.
De–energize the conductors before making any
line or auxiliary circuitry connections. Be sure
that Normal and Emergency line connections
are in proper phase rotation. Place engine generator starting control in the OFF position. Make
sure engine generator is not in operation.
Testing Power Conductors
Do not connect the power conductors to the ATB until
they are tested. Installing power cables in conduit, cable
troughs, and ceiling-suspended hangers often requires
considerable force. The pulling of cables can damage
insulation and stretch or break the conductor’s strands.
For this rea son, after the cables are pulled into position,
and before they are connected they should be tested to
verify that they are not defective or have been damaged
during installation.
!
Protect the switch from construction grit
and metal chips to prevent malfunction or
shortened life for the ATB switch.
If bottom cable entry is used, the foundation must be prepared so that conduit stubs are located correctly. Refer to
appropriate enclosure outline drawing for specified cable
entrance area and location. Provide cable bending space
and clearance to live metal parts.When a concrete floor is
poured, use interlocking conduit spacer caps or a wood or
metal template to maintain proper conduit alignment.
1--1
INSTALLATION (continued)
Connecting Power Conductors
A Wiring Diagram is furnished with the ATB. All wiring
must be made in accordance with the local codes. After
the power cables have been tested, connect them to the
appropriate terminal lugs on the Bypass Switch as shown
on the wiring diagram provided with this ATB. Make
sure that the lugs provided are suitable for use with the
cables being installed. Standard terminal lugs are
solderless screw type and will accept the wire sizes listed
on the drawings provided with the ATB. Be careful when
stripping insulation from conductors; avoid nicking or
ringing the conductor. Remove surface oxides from
conductors by cleaning with a wire brush. Follow
conductor manufacturer’s instructions when aluminum
conductor is used. Apply joint compound to conductor,
then carefully wipe away excess compound. Tighten the
cable lugs to the torque specified on the rating label.
!
Be sure that the Normal and Emergency power
connections are in proper phase rotation.
Bus Connections
If bus connection is used, use SAE grade 5 hardware to
connect bus to appropriate terminal plates on bypass
switching device. Wipe off bus surfaces before they are
joined. If bus is dirty, gently clean surfaces with a
non-flammablesolvent. Avoidtouching cleaned surfaces.
!
Do not breathe cleaning solvent vapors.
UseSAEgrade5hardwareandtightentheboltedjoints
tothetorquespecifiedinTable2-1.
!
The reliability of the connection depends
on how clean and how tight the joint is.
Table 2-1. Tightening torque values for bolted joints.
Bolt Diameter
(Grade 5 hardware)
in inches
5/16 12
3/8 20
1/2 50
5/8 95
3/4 155
Recommended
Tightening Torque
in foot pounds
Figure 1–1. Bus tie plates (top view).
!
See job specific drawings supplied with ATB.
Harnesses
All internal connections are made at the factory. The
bypass switch, transfer switch, and control panel are
joined together by an interconnecting wire harness. The
disconnect plugs are already engaged on enclosed
switches. For open–type switches, the plugs must be
engaged after installation is completed. Align harness
plugs with sockets in the control and push them together
until they are secure.
Engine Starting Contacts
and Auxiliary Circuits
The engine control contact signal connections and
auxiliary circuits are located on terminal block TB as
shownontheWiring Diagram provided with the ATB.
Connect the signal wires to the appropriate terminals.
1--2
INSTALLATION (continued)
Install the Transfer Switch
After the enclosure is installed and power cables or bus
connected to the Bypass Switch, the Transfer Switch
carriagecanberolledin. Thefloorofthecabinetmustbe
free of debris and clean. If necessary, use a vacuumcleaner.
Make a thorough inspection to be sure no tools are left
inside. The Bypass Handle must be in the BYPASS POS
position (closed on normal). The Isolation Handle (drawoutcrank)mustbefullycounterclockwiseagainststop.
Do not apply any electrical power to the ATB yet.
It is not necessary to remove the barriers from the bypass
switch and transfer switch. If you do remove them,
however, reinstall them carefully.
NOTE: Be sure to roll the correct Transfer
Switch into the enclosure. If more than one is
supplied, each will be labeled above the
solenoid operator.
The Transfer Switch NORMAL contacts must be closed.
If not, use the manual operator handle (maintenance
handle stored on lower carriage) to manually operate the
switch. See Figure 1–10. Check that all arc chutes and
interphase barriers are in place on the Transfer Switch.
Then grasp the Transfer Switch carriage frame and roll it
into the cabinet (isolation contacts facing inward). Align
the rollersbetween the floor guides and push the carriage
in until its crank pins engage the latch plates on both
sides. Then follow the procedure below:
Remove interference tag
after making inspection
on page 1-4.
SL1
solenoid
lock
handle
carriage
frame
Figure1–2. Solenoid latch interference tag.
Isolation
Handle shaft
Turn the draw-out
crank while checking
alignment of the
isolation contacts.
Figure 1–3. Isolation Handle.
NOTE: Solenoid lock SL1 on the Isolation
shaft inhibits operation of the drawout(Isolation contacts) unless the Transfer Switch and
Bypass Switch are in compatible positions.
This solenoid must energize to unlock. Because all power sources are de-energized, the
interference tag defeats the solenoid in the
following inspections.
Do the three inspections on page 1-4 without any
electrical power connected. The inspections will verify
that the isolation contacts are in proper alignment. If
necessary, add shims under the floor. It may be helpful to
remove the the right side of the enclosure to expose the
isolation contacts during the inspections.
!
Do not apply any power to the Bypass Switch.
Be sure that the Normal and Emergency source
circuit breakers are OPEN before proceeding.
Tran s f e r S w itch
NOMINAL CONTACT GAP 1/8” WHEN OPEN.
Figure 1–4. Switched neutral interlock.
1--3
INSTALLATION (continued)
Inspection 1
!
Do not force the Isolation Handle. Be sure that
the sensing lead isolation contacts do not hit the
male stabs head on, but rather slide on them.
IS
stab
Figure 1–5. Isolation contacts in TEST position.
sensing lead contact
isolation contacts
Move ATS from DISCONNECTED To TEST Position
(without electrical power)
Action T urn the Isolation Handle (Figure 1–3) clockwise approximately 7 or 8 turns.
Observe
The Transfer Switch should be pulled inward; the sensing lead isolation
contacts should make with the male stabs as shown in Figure 1–5.
Inspection 2
!
Do not force the Isolation Handle. Be sure that
the isolation contact fingers make with the male
stabs on both sides
in the CONNECTED position.
IS TS
Figure 1–6. Isolation contacts CONNECTED
(CLO SED).
TS
Move ATS From TEST To CONNECTED Position
(without electrical power)
With solenoid latch interference tag in place (Figure 1–2), continue slowly
Action
turning the Isolation Handle clockwise until it stops (approximately 6 or 7
turns). Now remove the interference tag from the solenoid latch.
The Transfer Switch should be pulled inward; the isolation contact fingers
Observe
should make with the male stabs as shown in Figure 1–6. Also check that
the Bypass Switch switched neutral contacts have opened (Figure 1–4).
Inspection 3
!
Be sure that the isolation contacts disconnect
in the TEST position; the sensing lead contacts
should still touch the male stabs.
Move ATS From CONNECTED Back To TEST Position
(without electrical power)
Action
Observe
Turn the Isolation Handle (Figure 1–3) back counterclockwise until the
isolation contacts separate (approximately 6 or 7 turns).
The Transfer Switch should be pushed outward; the isolation contacts
should disconnect, but the sensing lead contacts should remain touching
asshowninFigure1–7.
IS TS
Figure 1–7. Isolation contacts back in TEST position.
If all inspections are satisfactory connect harness plugs J2 and J5. Proceed to the Function Test.
1--4
INSTALLATION (continued)
Automatic Transfer
& Bypass–Isolation Switch
Tra n sf e r
Control
Retransfer
Delay
Bypass
observe
these lights
Tra n sf e r Sw i t ch
Connected
To
Normal
GREEN
Normal
Source
Accepted
GREEN
Tra n sf e r Sw i t ch
Connected
To
Emergency
RED
Emergency
Source
Accepted
RED
Figure 1-8. Standard controls and indicators.
Functional Test
Read all instructions on the Wiring Diagrams and labels
affixed to the ATB. Note the control features that are
provided and review their operation before proceeding.
After installing the ATB check the following:
S Bypass Handle should be in the BYPASS POS
position (closed on normal)
S Isolation contacts should be in the TEST position
(see pages 1-3 and 1-4).
S Automatic Transfer Switch should be in the N
(normal) position
If handles a re not in correct positions, follow instructions
for Bypassing and Isolating the automatic transfer switch
in Section 3. Do not force the handles. Electrical
interlocks prevent a wrong sequence of operation.
1–VoltageChecks
First check nameplat e on transfer switch; rated voltage
mustbethesameasnormalandemergencylinevoltages.
Useextremecautionwhenusingameterto
measure voltages. Do not touch power termi-
nals; shock, burns, or death could result !
Perform steps 1–6 at the right. Observe the status lights.
See Figures 1–8 and 1–11.
■ Black square means light is on.
❐ White square means light is off.
* If necessary, adjust voltage regulator on generator per the
manufacturer’s recommendations. The ATB will respond only to
rated voltage specified on the nameplate.
Now continue to 2–ManualOperationTest, next page.
Tra ns f er
Tes t
HOLD F OR
(
15 SEC ONDS
)
Close the normal source circuit
breaker. The Transfer Switch
Connected To Normal and the
1
Normal Source Accepted lights
should come on.
Use an accurate voltmeter to
check phase to phase and
phase to neutral voltages pres -
2
entatthetransferswitchnormal
source terminals.
Close the emergency source
circuit breaker. (Start generator,
if necessary.) The Transfer
3
Switch Connected To Normal &
Emergency Source Accepted
lights should come on.
Use an accurate voltmeter to
check phase to phase and
phase to neutral voltages pres -
4
ent at the transfer switch emergency source terminals.*
Useaphaserotationmeterto
check phase rotation of emer-
5
gency source; it must be the
same
as the normal source.
Shut down the engine–generator , if applicable. The Emergen-
cy Source Accepted light should
go off. Then put the starting
6
control selector switch (on the
generator set) in the automatic
position. Close enclosure door.
1--5
C
B
A
INSTALLATION (continued)
2 – Manual Operation Test
This procedure will check the manual operation of the
Bypass Switch, Isolation Switch, and Transfer Switch.
Observe the lights on the Status Indicator panel. The
Bypass Switch CLOSED ON NORMAL and the TEST
lights should be on. See Figure 1–11.
1. Isolate the Automatic Transfer Switch:
Installthe Isolation Handle and turn it counterclockwise until it stops
Automatic Transfer Switch is now in the Disconnected positi on (See Figure 1–9.).
The DISCONNECTED light should come on.
(approximately 7 or 8 turns). The
Turn draw-out crank
counterclockwise
approximately 7 or 8
turns until it stops.
Figure 1–9. Open (disconnect) isolation contacts.
2. A detachable manual operator handleis provided on
the Transfer Switch for maintenance purposes only.
!
Do not manually operate the Transfer Switch
unless the Isolation Handle is in the OPEN
position and the DISCONNECTED light is on.
rotating
weight
handle
Figure 1–11. Status Indicator Panel.
Insert the manual ha ndle into the hole in the rotating
weight as shown in Figure 1–10. Move the installed
handle up and down to manually operate the
Transfer Switch. The Switch should operate
smoothly without binding. Return the Transfer
Switch to the NORMAL position. Remove manual
operator handle and store it on the Transfer Switch in
the place provide d. Now go to page 1–7.
Turn dra w-o u t
crank clockwise
approximately 7 or 8
turns until TEST light
comes on.
Figure 1–10. Transfer Switch manual operator handle.
Figure 1–12. Move ATS to TEST position.
1--6
INSTALLATION (continued)
Automatic Transfer
& Bypass–Isolation Switch
Tra n sf e r
Control
Retransfer
Delay
Bypass
observe
these lights
Tra n sf e r Sw i t ch
Connected
To
Normal
GREEN
Normal
Source
Accepted
GREEN
Tra n sf e r Sw i t ch
Connected
To
Emergency
RED
Emergency
Source
Accepted
RED
Figure 1-13. Standard controls and indicators.
3 – Electrical Operation
This procedure checks electrical operation of the ATS.
!
Be sure to close all enclosure doors
before proceeding to prevent personal injury
in case of electrical system fault.
Transfer Test
The ATS should still be bypassed and isolated. Both
normal and emergency sources must be available and the
emergency source generator (if used) must be capable of
being started; put engine sta rting control in automatic
position. The Transfer Switch Connected to Normal light
and the Normal Source Accepted light should be on.
1. T urn Isolation Handle clockw is e about 7–8 turns until
TEST light comes on, DISCONNECTED light off.
2. Perform steps 1–5 at right. Observe the status lights.
■ Black square means light is on.
❐ White square means light is off.
3. Turn the Isolation Handle clockwise until it stops
(about 6 or 7 turns). The CONNECTED light should
come on, TEST light off. Remove the Isolation
Handle and store it inside the enclosure on the
carriage frame on the right side.
4. Turn the Bypass Handle clockwise to the AUTO-
MATIC POS position. The Bypass Switch CLOSED
ON NORMAL light should go off.
This completes the Functional Test of the A TB. The generator’s starting control should be left in autom a ti c position.
Tra ns f er
Tes t
HOLD F OR
(
15 SEC ONDS
)
operate
this switch
The Transfer Switch Connected
to Normal and Normal Source
1
Accepted lights should be on.
Turn and ho ld Tr ans f er Co ntr o l
switch clockwise to Transfer
Test until the engine starts
2
and runs (within 15 sec.). The
Emergency Source Accepted
light should come on.
Transfer switch will operate to
the Emergency position after
Feature2Btimedelay.The
Transfer Switch Connected To
3
Emergency light should come
on and Load Connected to
Normal light goes off.
Transfer switch will operate
back to Normal position after
Feature3Atimedelay.Forimmediate retransfer turn Tr a ns f er
Control counterclockwise to
4
Retransfer Delay Bypass.The
Transfer Switch Connected To
Normal light should come on;
Transfer Switch Connected to
Emergency light should go off.
The engine–generator will stop
after the Feature 2E time delay
(unloaded running engine cool-
5
down). The Emergency Source
Accepted light should go off.
1--7
SECTION 2 TESTING & SERVICE
TRANSFER TEST
Test the Automatic Transfer Switch portion of the 7000
Series ATBat least once a month. This procedure checks
the electrical operation of the Transfer Switch and
Controller. Put the engine–generator starting control (at
the engine–generator set) in automatic mode.
In the following test the generator will start, the load will
be transferred to the Emergency source, then back to the
Normal source. An interruption to the load will occur,
unless the the Transfer Switch contacts are bypassed before the test. See page 3–1 for bypassing & isolating instructions if no interruption of load is required.
!
Be sure to close the enclosure door
before proceeding to prevent personal injury
in case of electrical system fault.
Perform the five–step Electrical Operation --- Transfer
Tes t procedure on page 1–7.
PREVENTIVE MAINTENANCE
Reasonable care in preventive maintenance will insure
high reliability and long life for the 7000 Series ATB. An
annual preventive maintenance program is recommended.
ASCO Services, Inc. (ASI) is ASCO Power
Technologies’s national service organization. ASI
can be contacted at 1-800-800-2726 (ASCO) for information on preventive maintenance agreements.
Checklist for Yearly Inspection
REPLACEMENT PARTS
Replacement parts are available in kit form. When ordering parts provide the Serial No., Bill of Material No.
(BOM), and Catalog No. from the transfer switch nameplate. Contact your local ASCO Power Technolgies sales
office or ASI.
In the United States call 1--800--800--ASCO (2726)
In Canada call 1--888--234--ASCO (2726)
DISCONNECTING THE CONTROLLER
The harness disconnect plugs are furnished for repair
purposes only and should not have to be unplugged. If
the control panel must be isolated, follow these steps:
Bypass-- Isolation Switch is energized!
Do not touch isolation contact fingers;
shock, burns, or death could result!
Disconnecting the Plugs
1. Bypass and Isolate the Automatic Transfer Switch.
2. Open the upper enclosure door.
3. Separate the two quick disconnect plugs by squeezing the latches. Do not pull on the harness wires.
Reconnecting the Plugs
1. The ATS should be still bypassed and isolated.
2. The two harness plugs and sockets are keyed. Carefully align the plugs wi th the sockets and press
straight in until the latches click.
Hazardous voltage capable of causing shock,
burns, or death is used in this switch.
Deenergize both Normal -- Emergency power
sources before performing inspections!
j Clean the ATS enclosure. Brush and vacuum away
any excessive dust accumulation. Remove any moisture with a clean cloth.
j Check the transfer switch contacts
transfer switch barriers and check the condition of
the contacts. Replace contacts when pitted or worn
excessively. Reinstall the barriers carefully.
j Maintain transfer switch lubrication.Ifswitchissub-
jected to severe dust or abnormal operating conditions,
renew factory lubrication on all movements and linkages. Relubricate solenoid operator if TS coil is replaced. Don’t use oil; order lubrication kit 75-100.
j Check all cable connections & retighten them.
.Remove
3. Close the enclosure doors.
4. Follow Return to Service instructions on page 3–3.
2--1
TESTING & SERVICE
TROUBLE-SHOOTING
(continued)
Note any optional accessories that may be furnished on
the ATB and review their operation. Refer to any separate drawings and/or instructions that may be packed
with the ATB.
Table 2-1. Trouble-Shooting Checks.
PROBLEM
Engine–generator set does
not start when the Tra nsfer
Control switch is turned and
held
in Transfer Test position
or when normal source fails.
T ransfer switch does not
transfer the load to the
emergency source after the
engine–generator set starts.
T ransfer switch does not
transfer the load to normal
source when normal returns
or when the Transfer Control
switch is released.
Engine–generator-set does
not stop after load retransfer
to the normal source.
Hold Transfer Test switch 15
seconds or the outage must
be long enough to allow for
Feature1Ctimedelayplus
engine cranking and starting.
Wait for Feature 2B time delay
to time out.
Wait for Feature 3A time delay
to time out.
Wait for Feature 2E time delay
to time out.
1
OPERATION
Hazardous voltage capable of causing shock,
burns, or death is used in this switch.
Do not touch the power or load terminals
of the transfer switch!
CHECK IN NUMERICAL SEQUENCE
2
GEN-SET
Starting control must be in the
automatic position. Batteries
must be charged and
connected. Check wiring to
engine starting contacts.
Generator output circuit
breaker must be closed.
Generator frequency must be
at least 95% of nominal (57
Hz for a 60 Hz system.) *
---
Starting control must be in the
automatic position.
Voltmeter should read at
least 90% of nominal phase to
phase voltage between
transfer switch terminals EA &
EC (or EL1 & EL2 for 2 pole)*
Voltmeter should read at least
90% of nominal phase to
phase voltage between
transfer switch terminals NB &
NC, NC & NA, & NA & NB (or
NL1&NL2for2pole).
3
VOLTAGE
---
---
* These are factory settings. Refer to Controller User’s Guide.
If the problem is isolated to circuits on the controller or the transfer switch, call your local ASCO Power Technologies
sales office or ASI. In t he United States, call 1–800–800–2726. In Canada, call 1–888–234–2726. Furnish the Serial No.,
Bill of Material (BOM) No., and Catalog No. from the transfer switch nameplate.
MANUAL LOAD TRANSFER
This procedure manually transfers load to other source if
the Transfer Switch or Control Panel are out of service.
!
Close all enclosure doors to prevent personal
injury in case of electrical system fault.
1. Be sure that the Bypass Handle is in the BYPASS
POS (position) (see page 3–1).
2. Be sure that the Isolation Handle is in the TEST or
DISCONNECTED position (see page 3–2).
3. Turn the Bypass Handle clockwise to AUTOMATIC
POS (position).
4. Then pull–out or push–in the Bypass Handle and
turnit back to BYPASS POS (select opposite source):
- Emergency Source - pull out the handle
- Normal Source - push in the handle
Figure 2–1. Bypass Handle.
2--2
SECTION 3 BYPASSING & ISOLATING
BYPAS SING
This procedure explains how to Bypass the closed
Automatic Transfer Switch contacts. Bypassing is required before the ATS can be tested or isolated. The
Bypass Switch must be in the AUTOMATIC POS (position) and the Isolation Handle must be in the connected
position (turned clockwise until it stops). The CON-
NECTED light should be on.
1. Observe which Automatic Transfer Switch CLOSED
ON light is on (NORMAL or EMERGENCY) on the
STATUS INDICATOR panel. This light indicates the
source connected to the load.
2. Bypass to the same source connected to the load as
follows (selec t direction). See Figure 3-1, Figure 3-2,
and Figure 3-3.
ISOLATING
This procedure explains how to isolate the Automatic
Transfer Switch. Isolating is required before any service
work can be performed on the ATS. Observe the ATS
POSITION lights on the STATUS INDICATOR panel.
1. Bypass the closed Automatic Transfer Switch
contacts. See BYPASSING.
2. Isolate the Automatic Transfer Switch as follows.
Refer to Figure 3-4 and Figure 3-5.
Isolation Handle
installed through
enclosure door
Figure 3-4. Isolation Handle.
Figure 3-1. Bypass Handle.
To B y p a s s N o r m a l S o u r c e
Push in the Bypass
Handle then turn it
counterclockwise to
BYPASS POS.TheBypass Switch CLOSED
ON NORMAL light
should come on. *
Figure 3-2. Bypass to Normal.
To B y p a s s E m e r g e n c y S o u r c e
Pull out the Bypass
Handle then turn it
counterclockwise to
BYPASS POS.TheBypass Switch CLOSED
ON EMERGENCY
light should come on. *
Bypass–Isolation Switch is energized.
Do not touch isolation contact fingers;
shock, burns, or death could result.
To Isolate the Automatic Transfer Switch
a. Open the enclosure door and remove the Isolation
Handle stored on the right side of the carriage
frame. Close the door. Insert the Isolation Handle
into the shaft (through the door).
b. Turn Isolation Handle counterclockwise (about 6
or 7 turns) until the TEST light comes on.
c. Continue turning IsolationHandlecounterclock-
wise (approximately 10 or 11 turns) until it stops
and DISCONNECTED light comes on, TEST
light off.
d. Remove Iso lation Handle and store it inside the
enclosure on the right side of the carriage frame.
Figure 3-3. Bypass to Emergency.
The Automatic Transfer Switch can now be put in the
TEST or OPEN position. See ISOLATING.
*NOTE: When Acc. 66A is specified, the
handle operation is reversed. Follow
instruction on the door.
Figure 3-5. Isolated (DISCONNECTED) ATS.
The Transfer Switch can now be removed for inspection
and maintenance. See page 3–2.
3--1
BYPASSING & ISOLATING
(continued)
TRANSFER SWITCH REMOVAL
This procedure explains how to remove the Transfer
Switch for inspection and maintenance.
1. Bypass and Isolate the Automatic Transfer Switch by
carefully following directions on page 3–1. Be sure
that the ATS POSITION DISCONNECTED light is
on. Then remove the Isolation Handle.
Hazardous voltage capable of causing
electrical shock, burns, or death.
Do not touch isolation contact fingers.
2. Open the ATS cabinet doors all the way. Remove the
bottom louvered enclosure pan.
3. Separate the in–line disconnect plugs (P2 and P5) by
grasping and squeezing the plugs. Do not pull on the
harness wires.
4. Remove the Transfer Switch from the enclosure:
The enclosure tracks and floor in front must be free of
debris. Grasp the Transfer Switch carriage frame and
roll it out of the enclosure. See Figure 3-6.
TRANSFER SWITCH REINSTALLATION
This procedure explains how to install the Transfer Switch
after inspection and maintenance.
Hazardous voltage capable of causing
electrical shock, burns, or death.
Do not touch isolation contact fingers.
1. Open the ATS cabinet doors all the way. Remove the
bottom louvered enclosure pan (if not already
removed).
!
All arc chutes and interphase barriers must be in
place on the Transfer Switch. The enclosure
tracks and floor in front must be free of debris.
!
The Transfer Switch contacts must be closed
onthesamesourcethatisfeedingtheload
(use the maintenance handle – see page 1–6).
NOTE: BesuretoinstallthecorrectTransfer
Switch into the enclosure. If more than one is
supplied, each will be labeled.
2. Install the Transfer Switch into the enclosure:
Grasp the Transfer Switch carriage frame and
roll it into the enclosure (isolation contacts
facing inward). Align the rollers between the
floor guides and push the carriage in until its
crank pins engage the latch plates on both
sides.
3. Reconnect the in--- line disconnect plugs by grasping
and pressing them together. Be sure to connect the
correct plugs.
4. Close the cabinet door and install the enclosure pan.
5. Install the Isolation Handle. Carefully follow
directions on page 3–3 to put the Isolation Handle in
the TEST posi tion, then the CLOSED position.
Finally, follow directions on page 3–3 to put the
Bypass Handle in the AUTOMATIC POS (position).
Figure 3-6 Transfer Switch removed.
5. Close the cabinet doors.
3--2
BYPASSING & ISOLATING
RETURN TO SERVICE
This procedure explains how to return the Automatic
Transfer Switch to service after inspection and
maintenance. Observe the ATS POSITION lights o n the
STATUS INDICATOR panel.
1. Install the Transfer Switch into the enclosure.
Carefully follow directions on page 3–2.
!
Close enclosure door to prevent personal
injury in case of electrical system fault.
2.. Install the Isolation Handle (through the door) and
turn it clockwise (approximately 7 or 8 turns) until the
TEST light comes on, DISCONNECTED light off.
NOTE: If the emergency source is available, the
Au tom atic T r ans fer Switch may operate to the
emergen cy position. If it does, operate the door–
mounted RESET TO NORMAL toggle switch.
Electrical Operation Test: This procedure will check the
electrical operation of the Automatic Transfer Switch
without interrupting the load. It still should be Bypassed
and in the TEST position. The engine starting control
should be in the automatic position.
Transfer Test
(continued)
Perform the 5–step Transfer Test procedure on page 1–7.
The isolating contacts cannot be closed until the Transfer
Switch is in the same position as the Bypass Switch.
3. Observe which Bypass Switch CLOSED ON light is on
(NORMAL or EMERGENCY)ontheSTATUS
INDICATOR panel as shown in Figure 3-7. This light
indicates the source connected to the load.
4. Observe which Transfer Switch CLOSED ON light is
on (NORMAL or EMERGENCY). This light
indicates the position of the Transfer Switch. If it is
not in the same position as the Bypass Switch, change
the Transfer Switch position as follows.
To change the position of transfer switch
Operate to NORMAL Operate to EMERGENCY
Tur n Transfer Control
switch counterclockwise
to Retransfer Delay By-
pass.
Tra nsfer Switc h Connected to Normal light
should come on.
* If Feature 2B time delay is used, there will be a delay
before transfer to Emergency.
NOTE: WithNormalavailable,the Automatic
Transfer Switch will not stay in the emergency
position unless Fea ture 3A time delay is used
(at least 30 seconds).
Tur n Transfer Control
switch clockwise to Transfer
Test and hold
Transfer Switch Connected
to Emergency light should
come on.
.*
Figure 3-7 . Status Indicator Panel
!
Do not close the isola ting contacts unless
the transfer switch and bypass switch
are in the same
postion.
5. Turn the Isolation Handle and turn it clockwise until
it stops
(approximately 6 or 7 turns). The
CONNECTED light should come on, TEST light off.
6. Remove the Isolation Handle and store it inside the
enclosure on the right side.
7. Turn Bypass Handle
clockwise as shown in
Figure 3-8 to AUTO-
MATIC POS. The Bypass Switch CLOSED
ON NORMAL or
EMERGENCY light
should go off.
Figure 3-8 Turn Bypass Handle to AUTOMATIC.
The Automatic Transfer & Bypass Isolation Switchshould
be left in this position.
3--3
INDEX
A
auxiliary circuits, 1–2
B
bus connections, 1–2
bypassing the ATS, 3–1
C
catalog number, cover
cleaning, 2–1
connections
power, 1–2
controller
disconnecting, 2–1
see Controller User’s Guide
E
electrical operation, 1–7
Emergency Source Accepted light,
1–5
engine starting contacts, 1–2
F
frequency, generator, 2–2
functional test, 1–5, 1–6, 1–7
H
harness, 1–2
disconnect plugs, 2–1
I
inspection, 1–4, 3–1
installation, 1–1, 1–3
isolating the ATS, 3–1
L
lights, 1–5, 1–6
load connected to emergency, 1–5
load connected to normal, 1–5
lubrication, 2–1
M
maintenance, preventive, 2–1
maintenance handle, 2–2
warning, 2–2
manual load transfer, 2–2
warning, 2–2
N
nameplate, cover
Normal Source Accepted light, 1–5
O
operation
electrical, 1–7
manual, 1–6
warning, 1–6
P
parts, 2–1
phase rotation check, 1–2
preventive maintenance, 2–1
problem, 2–2
R
rating label, cover
replacement parts, 2–1
return to service, 3–3
S
service
ASCOServices,Inc.(ASI),2–1
settings
see Controller User’s Guide
T
test, functional, 1–5, 1–6, 1–7
testing power cables, 1–1
time delays, 2–1
see Controller User’s Guide
Transfer Control selector switch
Retransfer Delay Bypass, 1–7
Transfer Test, 1–7
Transfer Switch Connected To
Emergency light, 1–7
Transfer Switch Connected To
Normal light, 1–7
transfer test, 1–7, 2–1
transfer to emergency, 1–7, 2–1
transfer to normal, 1–7, 2–1
troubleshooting, 2–2
V
voltage checks, 1–5
voltage, pickup and dropout settings
see Controller User’s Guide
Printed in U.S.A.
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