7000 Series 7ACTB
Operator’s
Manual
Automatic Closed–T ransition Transfer
& Bypass–Isolation Switches
G design 1000 through 3000 amp. sizes
DANGER is used in this manual to warn of high
voltages capable of causin g shock, burns, or death.
WARNINGisusedinthismanualtowarn
of possible personal injury.
CAUTIONisusedinthismanualtowarn
of possible equipment damage.
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 & Preventive Maintenance 2-1..
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.........................
Refer to the outline and wiring drawings provided
with your 7000 Series ACTB for all installation and
connection details and accessories.
Refer t o Group 5 Controller User’s Guide 381333–126
for ATS stat us display messages, time delays, pickup
& dropout settings, and adjustments.
An experienced licensed electrician must install the
7ACTB.
Rating Label
Each 7000 Series 7ACTB contains a rating label to
define the load and fault circuit withstand /c losin g
ratings. R efer 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.
Nameplate
The Transfer Switch nameplate includes data for each
specific 7000 Series 7ACTB 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 ACTB catalog no. for overlapping
neutral, 3 pole, 1200 amp., 480 V, in Type 1 enclosure:
G7ACTB C 3 1200 N 5 C
Neutral
A –solid
B – switching
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
For sales or service call 1 800 800–2726 (ASCO) www.ascopower.com
Amperes Voltage Controller Enclosure
1000
1200
1600
2000
3000
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
381333–136 C
SECTION 1 INSTALLATION
The ASCO 7000 Series Automatic Closed–Tra nsition
Transfer & Bypass–Isolation Switch (ACTB) consists of
an upper bypass–isolation switch, a transfer switch, a
monitoring and transfer controller, and door–mounted
controls. The ACTB 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 the wood skid. Next
remove the rear lower panel and remove the two rear lag
screws securing the enclosure to the wood skid.
Supporting foundation and mounting
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 7000
Series ACTB for all mounting details including door
opening space.
If bottom cable entry is used, the foundation must be
prepared so that the conduit stubs are located correctly.
Refer t o the appropriate enclosure outline drawing for
specified cable entrance area and location. Providecable
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.
Mounting
Figure 1-1. Typical enclosure,
Refer to the enclosure outline drawing furnishe d with
this switch and mount the 7000 Series ACTB according to
the details and instructions shown on the drawing.
Remove three Shipping Angles
from the Transfer Switch
Open the lower front door. The Transfer Switch carriage
is secured to the frame for shipment. Remove the three
shipping angle (1 upper left, 1 upper right, 1 lower right).
To prevent serious damage, remove three
shipping angles from the Transfer Switch
carriage. Do not turn the Isolation Handle
until they are removed!
Figure 1-2. Remove three shipping L–angles.
1 --- 1
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 t o the ACTB 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 ACTB switch.
Connecting Power Conductors
A Wiring Diagram is furnished with the ACTB. Allwiring
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 ACTB. 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 ACTB. 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 plates on bypass
switching device. Wipe off bus surfaces before they are
joined. If bus is dirty, gently clean surfaces with a
non-flammablesolvent. Avoid touching 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
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.
Controller Ground
A grounding wire must be connected to the controller’s
lower left mounting stud. Because the controller is
mounted on the enclosure door, a conductive strap must
be used between the enclosure and the door. This
connection provides proper grounding which does not
rely upon the door hinges.
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 ACTB.
Connect the signal wires to the appropriate terminals.
1 --- 2
INSTALLATION
(continued)
GREEN
RED
observe
these lights
GREEN
RED
Figure 1-3. Standard controls and indicators.
Functional Test
Read all i nstructions on the Wiring Diagrams and labels
affixed to t he ACTB. Note the control features that are
provided and review their operation before proceeding.
After installing the ACTB check the following:
– Bypass Handle should be in the OPEN position.
– Isolation Handle should be in the CLOSED position.
– CN transfer switch should be CLOSED.
– CE transfer switch should be OPEN.
If handles are not in correct positions, follow instructions
for Bypassing and Isolating t he 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 !
Perform steps 1–6 at the right. Observe the status lights.
See Figure 1–3.
■ 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 ACTB will respond only
to rated voltage specified on the nameplate.
Now continue to 2 – Electrical Operation on next page.
1 --- 3
RED RED RED
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. Turn the Engine
Control switch to Run to start
the generator. 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.
Turn Engine Control switch to
Auto to stop the generator. The
Emergency Source Accepted
light should go off. Then put the
6
starting control selector switch
(on generator set) in automatic
position. Close enclosure door.
C
B
A
INSTALLATION (continued)
GREEN
RED
observe
these lights
GREEN
RED
Figure 1-4. 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 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 starting control in automatic
position. The Transfer Switch Connected to Normal light
and the Normal Source Accepted light should be on.
1. Turn the Isolation Handle clockwise (approximately
7 turns) until the window shows 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 1–4 at right. Observe the status lights.
■ Black square means light is on.
❐ White square means light is off.
3. Turn the Isolation Handle clockwise (approximately
16 turns) to the CONN (connected) position.
4. Push in the Bypass Handle and turn it counterclockwise until the OPEN indicator shows green.
RED RED RED
operate
this switch
Turn an d h o l d Tra n sfe r Co n tro l
switch clockwise to Transfer
Test until the engine starts
1
and runs (within 15 sec.). The
Emergency Source Accepted
light should come on.
Transfer switch CE closes and
then Transfer Switch CN opens
(closed–transition overlap). The
Transfer Switch Connected to
2
Emergency light should come
on and the Transfer Switch Con-
nected to Normal light should
go off (you might see a nd hear
the brief overlap transfer).
Transfer switch will operate
back to Normal position after
Feature3Atimedelay.Forimmediate retransfer turn Tr a nsf e r
Control counterclockwise to
3
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-
4
down). The Emergency Source
Accepted light should go off.
Load
Disconnect
Active
Load
Disconnect
Active
Load
Disconnect
Active
Load
Disconnect
Active
This completes the Functional Test of the ACTB.
1 --- 4
SECTION 2 TESTING & SERVICE
TRANSFER TEST
Test the Automatic Closed–Transition Transfer Switch
portion of the 7000 Series ACTB at least once a month.
This procedure checks the electrical operation of t he
Transfer Switchand Control Panel. Turn the EngineCon-
trol switch to Auto and put the engine–generatorstarting
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 four–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 ACTB.
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.
REPLACEMENT PARTS
Replacement parts are available in kit form. When ordering parts provide the Serial No., Bill of Mate rial No.
(BOM), and Catalog No. from the transfer switch nameplate. For service call ASCOServices at 1–800–800–2726;
you will be put in contact with your local ASI office.
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 bypa ssed 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.
3. Close the enclosure doors.
Checklist for Yearly Inspection
Hazardous voltage capable of causing shock,
burns, or death is used in this switch.
Deenergize both Normal – Emergency power
sources before performing inspections!
❐ Clean the ATS enclosure. Brush and vacuum away
any excessive dust accumulation. Remove any moisture with a clean cloth.
❐ 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.
❐ Maintain transfer switch lubrication.Ifswitchis
subjected to severe dust or abnormal operating conditions, renew factory lubrication on all movements
and linkages. Relubr ic ate solenoid operator if TS
coil is repl aced. Don’t use oil; order lubrication kit
75-100.
❐ Check all cable connections & retighten them.
.Remove
4. Follow Return to Service instructions on page 3–3.
2--1
TESTING & SERVICE
PROBLEM
TROUBLE-SHOOTING
Note any optional accessories that may be furnished on
the ACTB and review their operation. Refer to any separate drawings and/or instructions that may be packed
with the ACTB.
Table 2-1. Trouble-Shooting Checks.
1OPERATION 2 GEN-SET 3VOLTAGE
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.
Gen. does not stop after load
retransfer to normal source.
Failure to Synchronize
light comes on.
Extended Parallel Time
light comes on.
TS Locked Out
light comes on.
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.
Conditions of Normal or Emergency Sources not suitable for closed transition transfer.
Recheck voltage and frequency of both sources. Press Alarm Reset pushbutton.
CN and CE contacts are closed longer than setting in the Control Panel. Open the discon-
nected source circuit breaker, then call your nearest ASCO Service Center for assistance.
Transfer lockout operation has occured; transfer switch is disabled from automatic operation.
Open the disconnected source circuit breaker, then call your nearest ASI for assistance.
(continued)
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
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
terminals EA and EC (or EL1
and EL2 for 2 pole switches)*
Voltmeter should read at least
90% of nominal phase to
phase voltage between
terminals NB and NC, NC and
NA, and NA and NB (or NL1
and NL2 for 2 pole switches).
–
–
* These are factory settings. Refer t o Controller User’s Guide.
If the problem is isolated to circuits on the control l er or the transfer switch, call your local ASCO Power Technologies sales
office or ASI at 1–800–800–2726. Furnish the Serial No. and Catalog No. from the transfer switch nameplate.
MANUAL LOAD TRANSFER
MAINTENANCE HANDLE
This procedure manually transfers load to other source if
the Transfer Switch or Control Panel are out of service.
Bypass and isolate the Transfer Switch before
using the maintenance handle! See pages 3–1
Close enclosure doors to prevent personal
injury in case of electrical system fault.
and 3–2. Remove the hub and handle after
using them and store on frame.
Turn counterclockwise
1. Be sure that the Bypass Handle is 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
to OPEN contacts.
Turn clo c kwi s e to
CLOSE contacts.
slide hub
onto shaft
&insertpin
insert
handle
into hole
Grasp
handle
firmly
(see page 3–1).
Pull out shaft to operate
Emergency contacts.
Push in
Normal contacts.
shaft to operate
2--2
SECTION 3 BYPASSING & ISOLATING
BYPAS SING THE ATS*
This procedure explains how to Bypass the closed
automatictransfer 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 in the CLOSED
position (window). See Figures 3–1, 3–2, and 3–3.
Indicator shows:
green
ATS is not
To B y p a s s N or ma l push in handle
all the way & turn it clockwise.*
OPEN when the
●
bypassed.
Figure 3–1. Bypass Handle and position indicators.
To B y p a s s No r m a l S o u r c e *
You can only bypass to the same source
that the Transfer 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. Bypass to the same source as connected to
as follows (select Normal or Emergency).
switch
Indicator shows:
yellow
when ATS is bypassed to Emergency
or
yellow
ATS is bypassed to Normal Source.
To B y p a s s E me rg en c y pull out handlealltheway&turnitclockwise.*
EMERGENCY CLOSED
●
NORMAL CLOSED when
●
transfer
To Bypass Emergency Source*
(Load connected to Normal Source)
The Transfer Switch Connected To Normal light is on
and Transfer Switch Connected To Emergency light is off.
Push in
clockwiseuntil Bypass Switch Position shows CLOSED on
NORMAL (yellow indicator). The red light Unit Not In
Automatic will flash.
Push in
* the Bypass Handle all the way, then turn it
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
clockwiseuntil Bypass Switch Position shows CLOSED on
EMERGENCY (yellow indicator). The red light Unit
Not In Automatic will flash.
* the Bypass Handle all the way, then turn it
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.
BYPASSING & ISOLATING
ISOLATING THE ATS
(continued)
Isolating is required before any service work can be
performedon 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) until window shows TEST.TheATScanbe
tested now wi thout load interruption (see page 2–1).
automatic transfer switch contacts.
Bypass Switch
E
Turn c ra nk
counterclockwise
L
until
window
shows
TEST.
N
CONN
TEST
ISOLATE
counterclockwise – draws out
transfer switching device
Figure 3–6. Isolation Handle.
NOTE: In the TEST position the transfer
switching device solenoid operator circuit is
energized through secondary disconnects.
Hazardous voltage capable of causing
electrical shock, burns, or death;
do not touch any control circuit terminals.
position
window
unfold
crank
Automatic Transfer Switch
Figure 3–4. CONNECTED to TEST position.
3. Continue turning Isolation Handlecounterclockwise
(approx. 7 turns) until the window shows ISOLATE.
Bypass Switch
E
Turn c ra nk
counterclockwise
L
until
window
shows
ISOLATE.
N
Automatic Transfer Switch
Figure 3–5. TEST to ISOLATE position.
4. Open the lower enclosure door. Pull out the side rail
carriage 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.
Figure 3–7.Transfer switching device isolated
and pulled out for inspection.
See page 2–2 for mai ntenance handle use. A lifting yoke
kit 607064 is available to facilitate lifting by using an
overhead crane or similar equipment.
Transfer Switch weighs 350–450 lbs.
Use lifting device 607064 or other device
capable of lifting this weight to avoid
personal injury or equipment damage.
3 --- 2
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 BypassSwitch Position indica-
tor and lights). Refer to Figures 3–7, 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. Next push in
side rail carriage. 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
clockwise – draws in the Transfer Switch
Figure 3–8. Isolation Handle.
2. Turn the Isolation Handle clockwise (approx. 7
turns) until the window showsTEST.TheATScanbe
tested now wi thout load interruption (see page 2–1).
window
unfold
crank
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 TransferSwitch. 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).
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 in the same
the Bypass Switch handle, continue turning the
Isolation Handle clockwise (about 16 turns) until the
window shows CONN (connected).
Turn Tra n sfe r Co n tro l
switch to Transfer Test
(hold 15 seconds).*
Connected To Emergency
light should comes on.
position as
Bypass Switch
E
Bypass Switch
Turn c ra nk
clockwise
until
window
shows
TEST.
ATS
Figure 3–9. ISOLATE to TEST position.
N
E
L
L
Turn c ra nk
clockwise
until window
shows
N
CONN
(connected).
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 --- 3
ATS
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 NOR-
MAL or EMERGENCY) and the Isolation Handle must
be in the TEST position (window). If the handles are not
in these positions, referto 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
●
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 sa me 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
●
NORMAL when ATS is
●
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 Connected To Emergency light is off.
Push in
until Bypass Switch Position shows OPEN (green indicator). The Unit Not in Automatic light should be off.
* the Bypass Handlethen turn it counterclockwise
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
wise until Bypass Switch Position shows OPEN (green
indicator). The Unit Not in Automatic light should be off.
* the Bypass Handle then turn it counterclock-
Pull out
Bypass Switch
E
Bypass
Handle
&
turn it
counter-
L
clockwise.
N
ATS
Figure 3–12. Un–Bypass Normal.
The Automatic Closed–Transition 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 --- 4
Figure 3–13. Un–Bypass Emergency.
INDEX
A
Alarm Reset pushbutt on, 1–4, 2–2
auxiliary circuits, 1–2
B
bus connections, 1–2
bypassing the ATS, 3–1
C
catalog number, cover
cleaning, 2–1
closed–transition transfer, 1–4
connections
line, 1–1
controller
disconnecting, 2–1
see Controller User’s Guide
E
electrical operation, 1–4
Emergency Source Accepted light,
1–3
Engine Control selector switch
Auto position, 2–1
engine starting contacts, 1–2
Extended Parallel Time light, 2–2
F
Failure to Synchronize light, 2–2
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
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, 3–3
S
service
ASCOServices,Inc.(ASI),2–1
settings
see Controller User’s Guide
shipping angles, 1–1
warning, 1–1
shipping skid, 1–1
T
test, functional, 1–3, 1–4
testing power cables, 1–2
time delays, 2–1
see Controller User’s Guide
TS Locked Out light, 2–2
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, 1–4, 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. Copyright ASCO Power Technologies, L.P. 2007
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