Operator`s manual | Emerson 7ATB Power Supply User Manual

Operator’s
Manual
7000 Series 7ATB
Automatic Transfer &
Bypass–Isolation Switches
G design 1000 through 4000 amp. sizes
DANGER is used in this manual to warn of high
voltages capable of causing shock, burns, or death.
WARNING is used in this manual to
warn of possible personal injury.
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
CAUTION is used in this manual to
warn of possible equipment damage.
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.
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 . . . . . . . . . . . . . . . . . . . . . . . . . .
Preventive Maintenance . . . . . . . . . . . . . . . .
Disconnecting the Controller . . . . . . . . . . . .
Manual Load Transfer . . . . . . . . . . . . . . . . . .
Trouble-Shooting . . . . . . . . . . . . . . . . . . . . . .
4000 amp. size
2-1
2-1
2-1
2-2
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
Catalog Number Identification
G7ATB
Neutral
A – solid
B – switching
C – overlapping
blank – none
C
Phase Poles
2 – single Ø
3 – three Ø
Typical 7000 Series ATB catalog no. for overlapping
neutral, 3 pole, 4000 amp., 480 V, in Type 1 enclosure:
3
4000
Amperes
1000
1200
1600
2000
2600
3000
4000
N
5
Voltage
A 115
B 120
C 208
D 220
E 230
F 240
G 277
H 380
Status
Lights
&
Engine
Control
J 400
K 415
L 440
M 460
N 480
P 550
Q 575
R 600
C
Controller
5 – standard
5X – if
accessories
ordered
Enclosure
C – type 1
F – type 3R
G – type 4
L – type 12
blank – open type
Transfer Control
& Lights
Bypass
Handle
Group 5 Controller
Isolation
Handle
Transfer Switch
G7ATB 4000 A with the lower doors open (transfer switch shown)
SECTION 1 INSTALLATION
Remove Shipping Brackets / Angles
from the Transfer Switch
The ASCO 7000 Series Automatic Transfer &
Bypass–Isolation Switch (ATB) consists 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.
Open the lower front door(s). The Transfer Switch
carriage is secured to the frame for shipment. Remove
the three or four shipping brackets or L–angles (1 upper
left, 1 upper right, 1 lower right, or 2 lower on 4000 A).
Remove the Shipping Skid
To prevent serious damage, remove 3 shipping
angles from the transfer switch carriage. Do not
turn the Isolation Handle until they are removed!
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
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 including 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 3 or 4 shipping brackets ( L–angles)
Mounting
Figure 1-1. On 1000–3000 A remove three shipping
L–angles.
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 2 upper shipping brackets
remove 2 lower
shipping brackets
Figure 1-2. 4000 A remove four shipping L–angles.
1---1
INSTALLATION (continued)
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-flammable solvent. Avoid touching cleaned
surfaces.
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.
Do not breathe cleaning solvent vapors.
Use SAE grade 5 hardware and tighten the bolted
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
Recommended
(Grade 5 hardware)
Tightening Torque
in inches
in foot pounds
5/16
12
3/8
20
1/2
50
5/8
95
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
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.
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
shown on the Wiring Diagram provided with the ATB.
Connect the signal wires to the appropriate terminals.
Be sure that the Normal and Emergency power
connections are in proper phase rotation.
1---2
INSTALLATION (continued)
Transfer Switch
Connected
To
Normal
observe
these lights
Transfer
Control
Transfer Switch
Connected Retransfer Transfer
Test
To
Delay
HOLD FOR
Bypass (15 SECONDS )
Emergency
GREEN
RED
Normal
Source
Accepted
Emergency
Source
Accepted
GREEN
RED
Figure 1-2. Standard controls and indicators.
Close the normal source circuit
breaker. The Transfer Switch
1 Connected To Normal and the
Normal Source Accepted lights
should come on.
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.
Use an accurate voltmeter to
check phase to phase and
2 phase to neutral voltages present at the transfer switch normal
source terminals.
After installing the ATB check the following:
– Bypass Handle should be in the NORMAL position.
– Isolation Handle should be in the CONN position.
– TS transfer switch Normal contacts should be CLOSED
(Emergency contacts should be OPEN)
Close the emergency source
circuit breaker. (Start generator,
if necessary.) The Transfer
3
Switch Connected To Normal &
Emergency Source Accepted
lights should come on.
If handles are 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.
Use an accurate voltmeter to
check phase to phase and
4 phase to neutral voltages present at the transfer switch emergency source terminals.*
1 – Voltage Checks
First check nameplate on transfer switch; rated voltage
must be the same as normal and emergency line voltages.
Use a phase rotation meter to
check phase rotation of emer5
gency source; it must be the
same as the normal source.
Use extreme caution when using a meter
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 1–2.
Q Black square means light is on.
S White square means light is off.
Shut down the engine–generator, if applicable. The Emergency Source Accepted light should
6 go off. Then put the starting
control selector switch (on the
generator set) in the automatic
position. Close enclosure door.
* 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
A B C
INSTALLATION (continued)
Transfer Switch
Connected
To
Normal
observe
these lights
Transfer
Control
Transfer Switch
Connected Retransfer Transfer
Test
To
Delay
HOLD FOR
Bypass (15 SECONDS )
Emergency
GREEN
RED
Normal
Source
Accepted
Emergency
Source
Accepted
GREEN
RED
operate
this switch
Figure 1-3. Standard controls and indicators.
2 – Electrical Operation
The Transfer Switch Connected
1 to Normal and Normal Source
Accepted lights should be on.
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.
Turn and hold Transfer Control
switch clockwise to Transfer
Test until the engine starts
2
and runs (within 15 sec.). The
Emergency Source Accepted
light should come on.
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 automatic position.
The Transfer Switch Connected to Normal light and the
Normal Source Accepted light should be on.
1.
Transfer switch will operate to
the Emergency position after
Feature 2B time delay. The
3 Transfer Switch Connected To
Emergency light should come
on and Load Connected to
Normal light goes off.
Transfer switch will operate
back to Normal position after
Feature 3A time delay. For immediate retransfer turn Transfer
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.
Turn the Isolation Handle counterclockwise to the
TEST position.
NOTE: The engine generator may be signalled
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.
The engine–generator will stop
after the Feature 2E time delay
5 (unloaded running engine cooldown). The Emergency Source
Accepted light should go off.
This completes the Functional Test of the ATB.
1---4
SECTION 2
TESTING & SERVICE
TRANSFER TEST
REPLACEMENT PARTS
Test the Automatic Transfer 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.
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. 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!
Be sure to close the enclosure door before
proceeding to prevent personal injury in
case of electrical system fault.
Disconnecting the Plugs
1. Bypass and Isolate the Automatic Transfer Switch.
Perform the five–step Electrical Operation – Transfer
Test procedure on page 1–4.
2. Open the upper enclosure door.
3. Separate the two quick disconnect plugs by squeezing the latches. Do not pull on the harness wires.
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.
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.
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.
3. Close the enclosure doors.
4. Follow Return to Service instructions on page 3–3.
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!
S Clean the ATB enclosure. Brush and vacuum
away any excessive dust accumulation. Remove
any moisture with a clean cloth.
S Check the transfer switch contacts. Remove
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. If switch is
subjected 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.
S Check all cable connections & retighten them.
2---1
TESTING & SERVICE (continued)
TROUBLE-SHOOTING
Hazardous voltage capable of causing
shock, burns, or death is used in this switch.
Do not touch the power or load terminals
of the bypass switch or transfer switch!
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 Transfer
Control switch is turned and
held in Transfer Test position
or when normal source fails.
CHECK IN NUMERICAL SEQUENCE
1
2
OPERATION
GEN-SET
Hold Transfer Test switch 15
Starting control must be in the
seconds or the outage must
automatic position. Batteries
be long enough to allow for
must be charged and
Feature 1C time delay plus
connected. Check wiring to
engine cranking and starting. engine starting contacts.
3
VOLTAGE
–
Transfer switch does not
transfer the load to the
emergency source after the
engine–generator set starts.
Wait for Feature 2B time delay Generator output circuit
breaker must be closed.
to time out.
Generator frequency must be
at least 95% of nominal (57 Hz
for a 60 Hz system.) *
Voltmeter should read at least
90% of nominal phase to
phase voltage between
transfer switch terminals EA &
EC (or EL1 & EL2 for 2 pole)*
Transfer switch does not
transfer the load to normal
source when normal returns
or when the Transfer Control
switch is released.
Wait for Feature 3A time delay
to time out.
Voltmeter should read at least
90% of nominal phase to
phase voltage between
transfer switch terminals NB &
NC, NC & NA, & NA & NB (or
NL1 & NL2 for 2 pole).
Engine–generator-set does
not stop after load retransfer
to the normal source.
Wait for Feature 2E time delay Starting control must be in the
to time out.
automatic position.
–
–
* 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
pages 3–1 and 3–2. Remove the maintenance
handle after using it and store it on the frame.
Close enclosure doors to prevent personal
injury in case of electrical system fault.
1. Be sure that the Bypass Handle is CLOSED on either
Emergency or Normal (see page 3–1).
Turn counterclockwise
to Emergency.
2. Be sure that the Isolation Handle is in the TEST or
ISOLATE position (see page 3–2).
Turn clockwise
to Normal.
3. Turn the Bypass Handle counterclockwise to OPEN
the Bypass Switch. Then Bypass to the other source
(see page 3–1).
slide hub
onto shaft
2---2
Grasp
handle
firmly
insert
handle
into hole
SECTION 3 BYPASSING & ISOLATING
BYPASSING 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 in the
CLOSED position (window). See Figures 3–1, 3–2, and
3–3.
You can only bypass to the same source
that the Transfer Switch is connected.
Solenoid interlock prevents incorrect operation.
1.
2.
Observe which Transfer Switch Connected To light is
on (Normal or Emergency) on the door. This is the
position of the automatic transfer switch.
Bypass to the same source as connected to transfer
switch as follows (select Normal or Emergency).
Indicator shows:
Indicator shows:
yellow O EMERGENCY CLOSED
when ATS is bypassed to Emergency
or
green O OPEN when the
ATS is not bypassed.
yellow O NORMAL CLOSED when
ATS is bypassed to Normal Source.
To Bypass Normal push in handle
all the way & turn it clockwise.*
To Bypass Emergency pull out handle all the way & turn it clockwise.*
Figure 3–1. Bypass Handle and position indicators.
To Bypass Normal Source*
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.
(Load connected to Emergency Source)
The Transfer Switch Connected To Emergency light is on
and Transfer Switch Connected To Normal 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.
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.
Push in
Bypass
Handle
&
turn it
clockwise.
Bypass Switch
Pull out
Bypass
Handle
&
turn it
clockwise.
E
L
Bypass Switch
E
L
N
N
ATS
ATS
Figure 3–2. Bypass to Normal.
Figure 3–3. Bypass to Emergency.
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
BYPASSING & ISOLATING (continued)
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.
CONN
TEST
ISOLATE
position
window
1. Bypass the closed automatic transfer switch contacts.
See BYPASSING on page 3–1.
unfold
crank
Align position indicator. Do not leave
the handle in an intermediate position.
2. Turn the Isolation Handle counterclockwise
(approx. 16 turns, approx. 12 turns for 4000 A)
until window shows TEST. The ATS can be tested
now without load interruption (see page 2–1).
Bypass Switch
Turn crank
counterclockwise
until
window
shows
TEST.
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.
E
Hazardous voltage capable of causing
electrical shock, burns, or death; do not
touch any control circuit terminals.
L
N
Automatic Transfer Switch
Figure 3–4. CONNECTED to TEST position.
3. Continue turning Isolation Handle counterclockwise (approx. 7 turns, approx. 8 turns for 4000 A)
until the window shows ISOLATE.
Bypass Switch
Turn crank
counterclockwise
until
window
shows
ISOLATE.
E
Figure 3–7a. 1000–3000 A transfer switch
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.
L
1000–3000 A switches weighs 350–450 lbs; use
lifting yoke 607064. 4000 A switches weigh
approx. 600 lb; use lifting yoke 835745 -- 001 or
other device capable of lifting this weight to
avoid personal injury or equipment damage.
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.
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
BYPASSING & ISOLATING (continued)
grasp two handles
locking pin
with clevis pin
rail support
carriage
left support leg
locking pin
with clevis pin
adjust length to touch floor
right support leg
Drawout procedure
adjust length to touch floor
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
(detents on the rails require high initial force to overcome resistance).
Figure 3–7b. 4000 amp transfer switch isolated and pulled out for inspection.
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
BYPASSING & ISOLATING (continued)
RETURN TO SERVICE
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.
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) at the Bypass
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:
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.
To change the position of transfer switch
Close the enclosure door to prevent personal
injury in case of electrical system fault.
Operate to NORMAL
Turn Transfer Control
switch to Retransfer
Delay Bypass.
OperatetoEMERGENCY
Turn Transfer Control
switch to Transfer Test
(hold 15 seconds).*
Align position indicator. Do not leave
the handle in an intermediate position.
Connected To Normal
light should come on.
Connected To Emergency
light should comes on.
position
window
CONN
TEST
ISOLATE
* 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).
unfold
crank
Do not close the isolation contacts unless
the Transfer Switch (ATS) and Bypass
Switch are in the same position!
clockwise – draws in the Transfer Switch
5. When the transfer switch is in the same position as
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).
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
Turn crank
clockwise
until
window
shows
TEST.
Bypass Switch
E
E
L
L
Turn crank
clockwise
until window
shows
CONN
(connected).
N
ATS
N
ATS
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.
Figure 3–9. ISOLATE to TEST position.
3---4
BYPASSING & ISOLATING (continued)
RETURN TO SERVICE 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) and the
Isolation Handle must be in 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.
You can only bypass to the same source
that the ATS is connected. Solenoid
interlock prevents incorrect operation.
1
2
Observe which Bypass Switch Position indicator is
yellow (NORMAL or EMERGENCY) at the Bypass
Switch Handle. This indicates the source
connected to the load.
Un–Bypass to same source as the Bypass Switch
Position as follows (select Normal or Emergency).
Indicator shows:
yellow O EMERGENCY CLOSED
when ATS is bypassed to Emergency
or
Indicator shows:
yellow O NORMAL when ATS is
bypassed to Normal Source.
green O OPEN when the
ATS is not bypassed.
To un–Bypass Emergency pull out
handle all the way & turn it
counterclockwise.*
To un–Bypass Normal push in handle
all the way & turn it counterclockwise.*
Figure 3–11. Bypass Handle and position indicators.
To Un–Bypass Normal Source*
To Un–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.
(Load connected to Emergency Source)
The Transfer Switch Connected To Emergency light is on
and Transfer Switch Connected To Normal 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.
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.
Push in
Bypass
Handle
&
turn it
counterclockwise.
Bypass Switch
Pull out
Bypass
Handle
&
turn it
counterclockwise.
E
L
Bypass Switch
E
L
N
N
ATS
ATS
Figure 3–12. Un–Bypass Normal.
Figure 3–13. Un–Bypass Emergency.
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
INDEX
A
auxiliary circuits, 1–2
B
bus connections, 1–2
bypassing the ATS, 3–1
C
I
inspection, 3–1
installation, 1–1
isolating the ATS, 3–2
L
lights, 1–3, 1–4
catalog number, inside cover
load connected to emergency, 1–4
cleaning, 2–1
load connected to normal, 1–4
connections
power, 1–2
lubrication, 2–1
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
Printed in U.S.A.
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
ASCO Services, 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
E ASCO Power Technologies, L.P. 2009
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