Page 1
Operator’s
7000 Series 7A T B
Automatic T ransfer &
Manual
G design 1000 through 4000 amp. sizes
DANGER is used in this manual to warn of high
voltages capable of causin g shock, burns, or death.
WARNINGisusedinthismanualto
warn of possible personal injury.
CAUTIONisusedinthismanualto
warn of possible equipment damage.
Bypass–Isolation Switches
Refer to the outline and wiring drawings provided
with your 7000 Series ATB for all installation and
connection details and accessories.
Refer to Group 5 Controller User’s Guide 381333–126
for ATS status display messages, time delays, pickup
& dropout settings, and adjustments.
An experienced licensed electrician must install the
7ATB.
Rating Label
Each 7000 Series 7ATB contains a rating label to
define the loads and fault circuit withstand/closing
ratings. Refer to the label on the Transfer Switch for
specific values.
Do not exceed the values on the rating label.
Exceeding the rating can cause personal injury
or serious equipment damage.
4000 amp. size
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:
TABLE OF CONTENTS
section-page
INSTALLATION
Mounting 1-1.............................
Power Connections 1-2....................
Engine Starting & Auxiliary Circuits 1-2......
Functional Test 1-3, 1-4.....................
TESTING & SERVICE
Transfer Test 2-1..........................
Preventive Maintenance 2-1................
Disconnecting the Controller 2-1............
Manual Load Transfer 2-2..................
Trouble-Shooting 2-2......................
BYPASSING & ISOLATING
Bypassing the ATS 3-1....................
Isolating the ATS 3-2......................
Return to Service 3-3, 3-4...................
INDEX back cover.........................
50 Hanover Road, Florham Park, New Jersey 07932–1591 USA
For sales or service call 1 800 800–2726 (ASCO) www.ascopower.com
ASCO POWER TECHNOLOGIES CANADA PO Box 1238, 17 Airport Road, Brantford, Ontario, Canada N3T 5T3
381333–132 F
Page 2
Page 3
Catalog Number Identification
G7ATB C 3 4000 N 5 C
Typical 7000 Series ATB catalog no. for overlapping
neutral, 3 pole, 4000 amp., 480 V, in Type 1 enclosure:
Status
Lights
&
Engine
Control
Bypass
Handle
Neutral
A –solid
B – switching
C – overlapping
blank – none
Phase Poles
2 –singleØ
3 –threeØ
Amperes Voltage Controller Enclosure
1000
1200
1600
2000
2600
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
accessories
ordered
C –type1
F –type3R
G –type4
L –type12
blank – open type
Transfer Contr ol
&Lights
Isolation
Handle
Group 5 Controller
Transfer Switch
G7ATB 4000 A with the lower doors open (transfer switch shown)
Page 4
Page 5
SECTION 1 INSTALLATION
The ASCO 7000 Series Automatic Transfer &
Bypass–Isolation Switch (ATB) consi sts of an upper
bypass–isolation switch, a lower 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 Shipping Skid
Open the front lower door and remove the two front
lag screws securing the enclosure to t he wood skid.
Next remove the rear lower panel and remove the two
rear lag screws securing the enclosure to the wood skid.
Supporting Foundation
The supporting foundation for the enclosure must be
level and straight. Allow at least 35 inches in front of
the enclosure for draw out of the Transfer Switch.
Refer to the enclosure outline drawing included with
the ATB for all mounting details i ncluding door
opening space.
If bottom cable entry is used, the foundation must be
prepared so that the conduit stubs are located
correctly. Refer to the 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.
Remove Shipping Brackets / Angles
from the Transfer Switch
Open the lower front door(s). The Transfer Switch
carriage is secured to the frame for shipment. R em ov e
the three or four shipping brackets or L–angles (1 upper
left, 1 upper right, 1 lower right, or 2 lower on 4000 A).
To prevent serious damage, remove 3 shipping
angles from the transfer switch carriage. Do not
turn the Isolation Handle until they are removed!
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.
remove 3 or 4 shipping brackets ( L–angles)
Figure 1-1. On 1000–3000 A remove three shipping
L–angles.
remove 2 upper shipping brackets
remove 2 lower
shipping brackets
Figure 1-2. 4000 A remove four shipping L–angles.
1 --- 1
Page 6
INSTALLATION (continued)
Bus Connections
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 reason, 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 of the 7ATB switch.
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
providedaresuitableforusewiththecablesbeing
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.
If bus connection is used, use SAE grade 5 hardware to
connect bus to appropriate terminal p lates on bypass
switching device. Wipe off bus surfaces before they are
joined. If bus is dirty, gently clean surfaces with a
non-flammable solvent. Avoid touching cleaned
surfaces.
Do not breathe cleaning solvent vapors.
UseSAEgrade5hardwareandtightenthebolted
joints to the torque specified in Table 2-1.
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
Recommended
Tightening Torque
in foot pounds
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
Page 7
INSTALLATION
(continued)
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 1-2. 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:
– Bypass Handle should be in the NORMAL posit ion.
– Isolation Handle should be in the CONN position.
– TS transfer switch Normal contacts should be CLOSED
(Emergency contacts should be OPEN)
If handles are not in correct positions, follow inst ructions 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 nameplate on transfer switch; rated voltage
mustbethesameasnormalandemergencylinevoltages.
Useextremecautionwhenusingameter
to measure voltages. Do not touch power
terminals; shock, burns, or death could result !
Tra ns f er
Tes t
HOLD F OR
(
15 SECO NDS
)
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.
C
B
A
Perform steps 1–6 at the right. Observe the status lights.
See Figure 1–2.
Q Black square means light is on.
S 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 – Electrical Operation on next page.
1 --- 3
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.
Page 8
INSTALLATION (continued)
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 1-3. Standard controls and indicators.
2 – Electrical Operation
This procedure checks electrical operation of the ATS.
Be sure to close the enclosure door before
proceeding to prevent personal injury in
case of electrical system fault.
Transfer Test
The ATS should still be bypassed. Both normal and
emergency sources must be available and the emergency
source generator (if used) must be capable of being
started; put engine starting control in automa ti c position.
The Tra nsfer Switch Connected to Normal light and the
Normal Source Accepted light should be on.
1. Turn the Isolation Handle counterclockwise to the
TEST position.
NOTE: Theenginegeneratormaybesignalled
to start while turning the Isolation Handle. If
emergency source is available, the ATS may
operate to the emergency position. If it does,
operate Retransfer Delay Bypass switch.
2. Perform steps 1–5 at right. Observe the status lights.
Q Black square means light is on.
S White square means light is off.
3. Turn the Isolation Handle clockwise to the CONN
(connected) position.
4. Push in the Bypass Handle and turn it counterclockwise to the OPEN position.
Tra ns f er
Tes t
HOLD F OR
(
15 SECO NDS
)
operate
this switch
The Transfer Switch Connected
to Normal and Normal Source
1
Accepted lights should be on.
Turn an d hol d Tra n sfe r Co ntro 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 nsf 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.
This completes the Functional Test of the ATB.
1 --- 4
Page 9
SECTION 2 TESTING & SERVICE
TRANSFER TEST
Test the Automatic Transf er Switch portion of the 7000
Series ATB at 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 pages 3–1 and 3–2 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 1–4.
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’ national service organization. ASI
can be contacted at 1–800–800–2726 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 t ransfer switch
nameplate. For service call ASCO Services at
1–800–800–2726.
DISCONNECTING THE CONTROLLER
The harness disconnect plugs are furnished for repair
purposes only and should not have to be unplugged. If
the controller 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 lat ches. 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 with the sockets and press
straight in until the latches click.
3. Close the enclosure doors.
4. F ollow Return to Service instructions on page 3–3.
Hazardous voltage capable of causing
shock, burns, or death is used in this switch.
Deenergize both Normal – Emergency power
sources before performing inspections!
S Clean the A TB enclosure. Brush and vacuum
away any excessive dust accumulation. Remove
anymoisturewithacleancloth.
S 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.
S Maintain transfer switch lubrication.Ifswitchis
subjected to severe dust or abnormal operating
conditions, renew factory lubrication on all movements and linkages. Relubricate solenoid operator
if TS coil is replac e d . Don’t use oil; order lubrica-
tion kit 75-100.
S Check all cable connections & retighten them.
.Remove
2 --- 1
Page 10
TESTING & SERVICE
TROUBLE-SHOOTING
(continued)
Note any optional accessories that may be furnishe d 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
ofthebypassswitchortransferswitch!
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’s 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 the United States, call 1–800–800–2726. Furnish the Serial No., Catalog No., and Bill of
Material (BOM) No. from the transfer switch nameplate.
MANUAL LOAD TRANSFER
MAINTENANCE HANDLE
This procedure manually transfers load to other source if
the Transfer Switch or Controller are out of service.
Bypass and isolate the Transfer Switch
before using the maintenance handle! See
Close enclosure doors to prevent personal
injury in case of electrical system fault.
1. Be sure that the Bypass Handleis CLOSED on either
Emergency or Normal (see page 3–1).
2. Be sure that the Isolation Handle is in the TEST or
ISOLATE position (see page 3–2).
3. TurntheBypassHandlecounterclockwisetoOPEN
the Bypass Switch. Then Bypass to the other source
(see page 3–1).
pages 3–1 and 3–2. Remove the maintenance
handle after using it and store it on the frame.
Tu rn counterclockwise
to Emergency.
Turn cloc k wi s e
to Normal.
Grasp
handle
firmly
slide hub
onto shaft
insert
handle
into hole
2 --- 2
Page 11
SECTION 3 BYPASSING & ISOLATING
BYPAS SING THE ATS*
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 Handle must be in the OPEN position (green
indicator) and the Isolation Handle must be i n the
CLOSED position (window). See Figures 3–1, 3–2, and
3–3.
Indicator shows:
green
ATS is not
To By p as s No r m a l push in handle
all the way & turn it clockwise.*
OPEN when the
O
bypassed.
Figure 3–1. Bypass Handle and position indicators.
To B y p a s s N o r m a l S o u r ce *
You can only bypass to the same source
that the T ransfer Switch is connected.
Solenoid interlock prevents incorrect operation.
1. Observe which Transfer Switch Connected To light is
on (Normal or Emergency) on the door. This is the
position of the automatic transfer switch.
2. Bypasstothesamesourceasconnectedto
switch
as follows (select Normal or Emergency).
Indicator shows:
yellow
when ATS is bypassed to Emergency
or
yellow
ATS is bypassed to Normal Source.
To By p as s Em er g e n cy pull out handlealltheway&turnitclockwise.*
EMERGENCY CLOSED
O
NORMAL CLOSED when
O
transfer
To Bypass Emergency Source*
(Load connected to Normal Source)
The Transfer Switch Connected To Normal light is on
and Transfer Switch Conn ected To Emergency light is off.
Push in* the Bypass Handle all the way, then turn it
clockwise until Bypass Switch Position shows CLOSED
on NORMAL (yellow indicator). The red light Unit
Not In Automatic will flash.
Push in
Bypass Switch
E
Bypass
Handle
&
turn it
clockwise.
L
N
ATS
(Load connected to Emergency Source)
The Transfer Switch Connected To Emergency light is on
and Transfer Switch Connected To Normal light is off.
Pull out* the Bypass Handle all the way, then turn it
clockwise until Bypass Switch Position shows CLOSED
on EMERGENCY (yellow indicator). The red light
Unit Not In Automatic will flash.
Pull out
Bypass Switch
E
Bypass
Handle
&
turn it
clockwise.
L
N
ATS
Figure 3–2. Bypass to Normal.
The automatic transfer switch can now be put in the TEST or OPEN position. See ISOLATING on page 3–2.
*NOTE: When Accessory 66A (reversed Normal & Emergency connections) is specified,
the handle push–pull operation is reversed. Follow instructions on the door.
3 --- 1
Figure 3–3. Bypass to Emergency.
Page 12
BYPASSING & ISOLATING
ISOLATING THE ATS
Isolating is required before any service work can be
performed on the automatic transfer switch (ATS).
Refer to Figures 3–4, 3–5, 3–6, and 3–7.
1. Bypass the closed
See BYPASSING on page 3–1.
Align position indicator. Do not leave
thehandleinanintermediateposition.
2. Turn the Isolation Handle counterclockwise
(approx. 16 turns, approx. 12 turns for 4000 A)
until window shows TEST.TheATScanbetested
now without load interruption (see page 2–1).
automatic transfer switch contacts.
Bypass Switch
E
(continued)
CONN
TEST
ISOLATE
counterclockwise – draws out transfer switch
Figure 3–6. Isolation Handle.
NOTE: In the TEST position the transfer
switching device solenoid operator circuit is
energized through secondary disconnects.
position
window
unfold
crank
Turn crank
counterclockwise
L
until
window
shows
TEST.
N
Automatic Transfer Switch
Figure 3–4. CONNECTED to TEST position.
3. Continue turning Isolation Handle counterclock-
wise (approx. 7 turns, approx. 8 turns for 4000 A)
until the window shows ISOLATE.
Bypass Switch
E
Turn crank
counterclockwise
L
until
window
shows
ISOLATE.
N
Automatic Transfer Switch
Figure 3–5. TEST to ISOLATE position.
4. Open the lower enclosure door(s). Pull out the
side rail carriage. On 4000 A extend two support
legs; see Figure 3–7b. Then roll out the transfer
switch. It can be safely inspected in this position.
The transfer switch can also be removed for easier
maintenance operations.
Hazardous voltage capable of causing
electrical shock, burns, or death; do not
touch any control circuit terminals.
Figure 3–7a. 1000–3000 A transfer sw itch
isolated and pulled out for inspection.
See page 2–2 for maintenance handle use. For
1000–3000 A lifting yoke kit 607064 is available to
facilitate lifting by using an overhead crane or similar
equipment. For 4000 A use lifting yoke 835745–001.
1000–3000 A switches weighs 350–450 lbs; use
lifting yoke 607064. 4000 A switches weigh
approx. 600 lb; use lifting y o ke 835745-- 001 or
other device capable of lifting this weight to
avoid personal injury or equipment damage.
To avoid personal injury and equipment
damage on 4000 A switches, two support legs
must be extended as shown in Figure 3–7b.
Substantial initial force is required to pull out
the transfer switch (there are detents on rails).
3 --- 2
Page 13
grasp two handles
BYPASSING & ISOLATING
(continued)
locking pin
with clevis pin
rail support
left support leg
adjust length to touch floor
Drawout procedure
1. Bypass and Isolate the ATS, then open both lower doors.
2. Pull out the rail support carriage all the way.
3. Remove left & right clevis and locking pins, drop two support legs, reinstall locking
and clevis pins (to lock in place), and adjust both leg lengths to extend to the floor.
4. Stand directly in front of transfer switch. Grasp both handles, and pull straight out
(detentsontherailsrequirehighinitialforcetoovercomeresistance).
Figure 3–7b. 4000 amp transfer switch isolated and pulled out for inspection.
carriage
adjust length to touch floor
locking pin
with clevis pin
right support leg
To avoid personal injury and equipment
damage on 4000 A switches, two support legs
must be extended as shown in Figure 3–8.
Substantial initial force is required to pull out
the transfer switch (there are detents on rails).
The 4000 A transfer switch weighs 600 lb.
Use lifting yoke 835745–001 or other device
capable of lifting this weight to avoid personal
injury or equipment damage.
3 --- 3
Page 14
BYPASSING & ISOLATING
RETURN TO SERVICE
(continued)
This procedure explains how to return the automatic
transfer switch (ATS) to service after inspection and
maintenance. Observe the Bypass Switch Position
indicator and lights). Refer to Figures 3–7a, 3–7b, 3–8,
3–9, and 3–10.
1. Slide the transfer switch (ATS) into the enclosure
(isolation contacts facing inward) until its crank pins
engage the latch plates on both sides. On 4000 A
substantial force is required to overcome detents on
the rails. Next push in side rail carriage. On 4000 A
first retract the two legs and lock them in place. See
Figure 3–7b. Then close enclosure door.
Close the enclosure door to prevent personal
injury in case of electrical system fault.
Align position indicator. Do not leave
thehandleinanintermediateposition.
position
CONN
TEST
ISOLATE
window
Solenoid interlock prevents you from closing
the isolation contacts until the ATS is in the
same
position as the Bypass Switch.
3. Observe which Bypass Switch Position indicator is
black (NORMAL or EMERGENCY)attheBypass
Switch Handle. This indicates the source
connected to the load.
4. Observe which Transfer Switch Connected To light is
on (Normal or Emergency) on the door. This is the
position of the Transfer Switch. If it is not in the
same position as the Bypass Handle change the
position of the Transfer Switch as follows:
To change the position of transfer switch
Operate to NORMAL OperatetoEMERGENCY
Turn Tra n sfe r Co n tro l
switch to Retransfer
Delay Bypass.
Connected To Normal
light should come on.
* If Feature 2B time delay is used, there will be a delay
before transfer to Emergency.
NOTE: With Normal available, the
automatic transfer switch will not stay in the
emergency position unless Feature 3A time
delay is used (at least 30 seconds).
Turn Tra n sfe r Co n tro l
switch to Transfer Test
(hold 15 seconds).*
Connected To Emergency
light should comes on.
unfold
crank
clockwise – draws in the Transfer Switch
Figure 3–8. Isolation Handle.
2. Turn the Isolation Handle clockwise (approx. 7
turns, approx. 8 turns for 4000 A) until the window
shows TEST. The ATS can be tested now without
load interruption (see page 2–1).
Bypass Switch
E
Turn crank
clockwise
L
until
window
shows
TEST.
N
Do not close the isolation contacts unless
the Transfer Switch (ATS) and Bypass
Switch are in the same position!
5. When the transfer switch is i n the same
the Bypass Switch handle, continue turning the
Isolation Handle clockwise (approx. 16 turns,
approx. 12 turns for 4000 A) until the window
shows CONN (connected).
Bypass Switch
Turn crank
clockwise
until window
shows
CONN
(connected).
ATS
position as
E
L
N
ATS
Figure 3–9. ISOLATE to TEST position.
Figure 3–10. TEST to CONNECTED position.
Now continue to the next page for instructions on how to
return the Bypass Handle to the OPEN postition.
3 --- 4
Page 15
BYPASSING & ISOLATING
RETURN TO SERVICE continued*
(continued)
This procedure explains how to return the Bypass
Switch Handle to the OPEN position. The Bypass
Handle must be in the CLOSED position (yellow
indicator on NORMAL or EMERGENCY)andthe
Isolation Handle must be i n the TEST position
(window). If the handles are not in these positions,
refer to Return to Service on page 3–3. See Figures
3–11, 3–12, and 3–13.
Indicator shows:
green
ATS is not
To un–Bypass Normal push in handle
all the way & turn it counterclockwise.*
OPEN when the
O
bypassed.
Figure 3–11. Bypass Handle and position indicators.
You can only bypass to the same source
that the ATS is connected. Solenoid
interlock prevents incorrect operation.
1 Observe which Bypass Switch Position indicator is
yellow (NORMAL or EMERGENCY)attheBypass
Switch Handle. This indicates the source
connected to the load.
2 Un–Bypass to same source as the Bypass
Position
as follows (select Normal or Emergency).
Indicator shows:
yellow
when ATS is bypassed to Emergency
or
yellow
bypassed to Normal Source.
EMERGENCY CLOSED
O
NORMAL when ATS is
O
To un–Bypass Emergency pull out
handle all the way & turn it
counterclockwise.*
Switch
To Un–Bypass Normal Source*
(Load connected to Normal Source)
The Transfer Switch Connected To Normal light is on
and Transfer Switch Conn ected To Emergency light is off.
Push in* the Bypass Handle then turn it counterclockwise until Bypass Switch Position shows OPEN (green
indicator). The Unit Not in Automatic light should be
off.
Push in
Bypass Switch
E
Bypass
Handle
&
turn it
counter-
L
clockwise.
N
ATS
To Un–Bypass Emergency Source*
(Load connected to Emergency Source)
The Transfer Switch Connected To Emergency light is on
and Transfer Switch Connected To Normal light is off.
Pull out* the Bypass Handle then turn it counterclockwise until Bypass Switch Position shows OPEN (green
indicator). The Unit Not in Automatic light should be
off.
Pull out
Bypass Switch
E
Bypass
Handle
&
turn it
counter-
L
clockwise.
N
ATS
Figure 3–12. Un–Bypass Normal.
The Automatic Transfer & Bypass–Isolation Switch should be left in this position.
*NOTE: When Accessory 66A (reversed Normal & Emergency connections) is specified,
the handle push–pull operation is reversed. Follow instructions on the door.
3 --- 5
Figure 3–13. Un–Bypass Emergency.
Page 16
INDEX
A
auxiliary circuits, 1–2
B
bus connections, 1–2
bypassing the ATS, 3–1
C
catalog number, inside cover
cleaning, 2–1
connections
power, 1–2
controller
disconnecting, 2–1
see Controller User’s Guide
D
drawout, transfer switch, 3–2, 3–3
E
electrical operation, 1–4
Emergency Source Accepted light,
1–3
Engine Control selector switch
Auto position, 2–1
engine starting contacts, 1–2
F
foundation, 1–1
frequency, generator, 2–2
functional test, 1–3, 1–4
H
harness, 1–2
disconnect plugs, 2–1
HELP
customercare@asco.com
800–800–ASCO
I
inspection, 3–1
installation, 1–1
isolating the ATS, 3–2
L
lights, 1–3, 1–4
load connected to emergency, 1–4
load connected to normal, 1–4
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, 1–3
O
operation
electrical, 1–4
manual, 2–2
warning, 2–2
P
parts, 2–1
phase rotation check, 1–3
preventive maintenance, 2–1
problem, 2–2
R
rating label, cover
removal of shipping angles, 1–1
removal of shipping skid, 1–1
replacement parts, 2–1
return to service, 3–4, 3–5
S
service
ASCOServices,Inc.(ASI),2–1
settings
see Controller User’s Guide
shipping angles, 1–1
warning, 1–1
shipping skid, 1–1
support legs on 4000 A, 3–3
T
test, functional, 1–3, 1–4
testing power cables, 1–2
time delays, 2–1
see Controller User’s Guide
Transfer Control selector switch
Retransfer Delay Bypass, 1–4
Transfer Test, 1–4
Transfer Switch Connected To
Emergency light, 1–4
Transfer Switch Connected To
Normal light, 1–4
transfer test, 1–3, 2–1
transfer to emergency, 1–4, 2–1
transfer to normal, 1–4, 2–1
troubleshooting, 2–2
V
voltage checks, 1–3
voltage, pickup and dropout settings
see Controller User’s Guide
Printed in U.S.A.
E ASCO Power Technologies, L.P. 2009
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