Winco ASCO-300-E User Manual
Operator’s
Automatic Transfer Switches
Manual
E design, 260 and 400 amp. sizes
DANGER is used in this manual to warn of high
voltages capable of causing shock, burns, or death.
!
WARNINGisusedinthismanualto
warn of possible personal injury.
!
Series 300
Refer to the outline and wiring drawings provided with
your ASCO Series 300 ATS for all installation details.
ASCO Series 300 Automatic Transfer Switches (ATSs) are
Listed under Underwriters Laboratories UL 1008 Standard
for Safety for Automatic Transfer Switches. ASCO Series
300s are also Listed under CSA C22.2 No. 178 Standard for
Automatic Transfer Switches. All control features are UL
Component Recog nized, which assures that ASCO automatic
transfer switches meet OSHA Safety Requ irem ents and will
be acceptable to electrical inspectors.
CAUTIONisusedinthismanualtowarn
of possible equipment damage.
An experienced licensed electrician must install the ATS.
ASCO Series 300 Automatic Transfer Switches are suitable
for emergency and standby system applications. They meet
emergency system rating requirements as defined in
National Electrical Code (NEC) Article 700 and UL 1008.
Also, they are suitable for the requirements of NEC Article
517 – Health Care Facilities, NEC Article 701 – L egally
Required Standby Systems, NEC Article 702 – Optional
Standby Systems, NFPA 99 Health Care Facilities, and
NFPA 110 Emergency and Standby Power Systems.
Rating Label
Each automatic trans fer switch con tains 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.
TABLE OF CONTENTS
section
INSTALLATION 1..........................
SEQUENCE OF OPERATION 2.............
TESTING & SERVICE 3....................
ADJUSTMENTS 4.........................
CONTROL FEATURES 5...................
INDEX back cover.........................
260 & 400 amp sizes
50 Hanover Road, Florham Park, New Jersey 07932–1591 USA
1 800 937–2726 (ASCO), for service call 1 800 800–2726 (ASCO) www.asco.com
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
381333–067 F
Nameplate and Catalog Number Identification
The Transfer Switch nameplate includes data for each specific ASCO Series 300 ATS. Use the ATS only within the
limits shown on this nameplate. A typical Catalog Number is shown below with its elements explained.
The example is for a Series 300 ATS with switched neutral, 3 pole, 400 amp., 480 V, in a Type 1 enclosure:
E 300 C 3 400 N 1 C
transfer switch
prefix letter
Neutral
C – overlapping
blank – solid
load power
connections
emergency power
connections
Phase Poles
2 –singleØ
3 –threeØ
Amperes Voltage Controller Enclosure
260
400
A 115
B 120
C 208
D 220
E 230
F 240
H 380
K 415
L 440
M 460
N 480
P 550
Q 575
R 600
1 –standard
1X –if
accessories
ordered
C –type1
F –type3R
G –type4
L –type12
blank – open type
J 400
membrane
controls
terminals for
engine start
contacts
Transfer
Switch
terminals for
switch position
contacts
normal power
connections
400 amp. size in typical enclosure with location of customer connections
Controller
SECTION 1 INSTALLATION
Series 300 Automatic Transfer Switches are factory wired
and tested. Installation requires skid removal then securing the enclosure to the supporting foundation.
Supporting Foundation
The supporting foundation for the enclosure must be level
and straight. Refer to the applicable enclosure outline
drawing included with the Series 300 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 enclosure outline drawing for specified area
and location. Provide cable bendingspace and clearanceto
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.
!
Be sure that the insulator piece is behind
260 and 400 ampere transfer switches.
insulator
backing
piece
Mounting
Refer to the applicable enclosure outline drawing furnished with this switch and mount the Series 300 according
to details and instructions shown on diagram.
!
Protect the switch from construction grit
and metal chips to prevent malfunction or
shortened life of the automatic switch switch.
Mount the ASCO ATS vertically to a rigid supporting
structure. Level all mounting points by using flat washers
behind the holes to avoid distortion of the switch.
Transfer switches rated 260 and 400 amp. are mounted on
an insulator backing piece (installed behind the transfer
switch). If the transfer switch is removed from the cabinet
and then reinstalled, this insulator piece must be placed
behind the transfer switch. See Figure 1–1.
Line Connections
Refer to the Wiring Diagram provided with your Series 300
ATS. All wiring must be made in accordance with the
National Electrical Code and local codes.
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.
It is not necessary to remove the barriers from the transfer
switches to install cables.
Figure 1-1. Insulator for 260 and 400 amp. E–design
transfer switches.
The controller is mounted on the cabinet door. Anadd-on
DIN rail is provided for some optional accessories and is
mounted below the controller on the door.
Testing Power Conductors
Do not connect the power conductors to the ASCO Series
300 transfer switch 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
should be tested to verify that they are not defective or
have been damaged during installation.
they are connected, they
Connecting Power Conductors
After the power cables have been tested, connect them to
the appropriate terminal lugs on the transfer switch as
shown on the wiring diagram provided with this Series 300.
Make sure the lugs provided are suitable f or 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 Series 300. Be careful when
stripping insulation from the cables; avoid nicking or
ringing the conductor. Remove surface oxides from cables
by cleaning with a wire brush. When aluminum cable is
used, apply joint compound to conductors. Tighten cable
lugs to the torque specified on rating label.
Do not run cables behind the switch. Cables can be
bundled on the right side of the switch. Maintain proper
electrical clearance between the live metal parts and
grounded metal: ½ inch minimum.
1--1
INSTALLATION (continued)
Engine Starting Contacts
Controller Ground
The engine control contact connections are located on the
transfer switch. Connect signal wires to appropriate term–
inals as specified in T able A, shown in Figure 1–2.
Table A. Engine start connections.
When normal source
fails
contact closes TB14 and TB15
contact opens TB14 and TB16
Transfer Switch
Terminals on transfer
switch
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.
Harnesses
The transfer switch is connected to the left side of the
controller by a plug–in harness (two plugs).
Auxiliary Circuits
Connect auxiliary circuit wires to appropriate terminalson
transfer switch. Note the control f eatures that are furnished on this switch. Make the necessary auxiliary
connections by referring to Section 5, Control Features.
Figure 1-2. Engine starting contact label and location
for 260 and 400 amp. E–des ign transfer switches.
Connections to Controller for other Control Features (located on bottom of Controller):
Load Disconnect
Feature
Connections
(see Wiring Diagram
& refer to page 5–5
for DIP switch settings)
Programmable
Engine Exerciser
connection,
if provided
(refer to
page 5–2)
Remote Control Features Connections
(refer to the Wiring Diagram &
page 5–5 for DIP switch settings)
Each control contact must be suitable
for a 5 V DC low energy circuit.
for factory
use only
Figure 1-3. Input / output label on the Controller showing possible connections to the lower terminal block.
1--2
INSTALLATION (continued)
Functional Test
The Functional Test consists of three checks: manual
operation, voltage checks, and electrical operation.
!
Do these checks in the order presented to
avoid damaging the automatic transfer switch.
Read all instructions on the Wiring Diagram and labels
affixed to the automatic transfer switch. Note the control
features that are provided and review their operation
before proceeding.
1 – Manual Operation Te st
A detach ab l e manual operator handle is provided on the
Transfer Switch for maintenance purposes only
operation of the transfer switch should be checked before
it is energized (operated electrically).
!
Do not manually operate the transfer switch
until both power sources are disconnected:
open both circuit breakers.
1. Insert the maintenance handle into the hole in the
shaft, left side of the operator.
2. Move the maintenance handle as shown to manuall y
operate the transfer switch. The switch should operate
smoothly without any binding. If it does not, check for
shipping damage or construction debris.
.Manual
maintenance
hole
handle
shaft
Figure 1-4. Removable maintenance handle on
260 and 400 amp. E–design transfer switches.
3. Return the transfer switch to the N (normal) position.
4. R emove the maintenance handle and store it on the
transfer switch in the place provided.
!
Verify that the maintenance handle has
been removed before proceeding!
Now continue to 2–VoltageCheckson next page.
1--3
INSTALLATION (continued)
TRANSFER SWITCH TEST BYPASS TIME DELAY SET ENGINE EXERCISER
observe these lights
Press for 15 Seconds
Figure 1–5. Standard controls and indicators.
2–VoltageChecks
First check nameplate on transfer switch; rated voltage
mustbethesameasnormalandemergencylinevoltages.
!
Verify that the feeders have been
connected to the proper lugs.
Use extreme caution when using a meter
to measure voltages in the following
steps. Do not touch power terminals;
shock, burns, or death could result !
Perform steps 1 through 6 at the right. Observe the status
lights. See Figure 1–5.
● Black circle means light is on.
❍ White circle means light is off.
* If necessary, adjust voltage regulator on the generator
according to the manufacturer’s recommendations. The
Automatic Transfer Switch will respond only to the rated
voltage specified on the Transfer Switch nameplate.
Press until light FLASHES
Close the normal source circuit
breaker. The Transfer Switch
Connected To Normal and the
1
Normal Source Available 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
and the Emergency Source
Available 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
1--4
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.
Now continue to 3 – Electrical Operation on next page.
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