Generac Power Systems, Inc.

Owner’s Manual
For
Automatic Transfer Switch
300 - 400 Amp, Service Entrance/Non-Service Entrance
Model Numbers
RTSW300A3
RTSW400A3
RTSC400A3
MODEL NUMBER: _________________________
SERIAL NUMBER: _________________________
DATE PURCHASED:________________________
WWW.GENERAC.COM
888-436-3722
Para español , visita: http://www.generac.com/service-support/product-support-lookup
Pour le français, visiter : http://www.generac.com/service-support/product-support-lookup
SAVE THIS MANUAL FOR FUTURE REFERENCE
WARNING
California Proposition 65. This product contains or
emits chemicals known to the state of California to
cause cancer, birth defects, and other reproductive
harm.
(000005)
ii
Automatic Transfer Switch Owner’s Manual
Table of Contents
Table of Contents
Section 1 Safety
Section 4 Operation
1.1 General ........................................................... 1
4.1 Functional Tests and Adjustments ........... 11
1.2 General Hazards ............................................ 1
4.2 Manual Operation ........................................ 11
4.2.1 Close to Normal Source Side ........................... 11
Section 2 General Information
2.1 Introduction ................................................... 3
2.2 Unpacking ...................................................... 3
4.2.2 Close to Standby Source Side ......................... 11
4.2.3 Return to Normal Source Side ......................... 11
4.3 Voltage Checks ........................................... 12
4.3.1 Utility Voltage Checks ...................................... 12
2.3 Equipment Description ................................. 3
4.3.2 Generator Voltage Checks ............................... 12
2.3.1 Transfer Switch Mechanism ............................... 3
4.4 Generator Tests Under Load ..................... 13
2.3.2 Utility Service Circuit Breaker (if equipped) ........ 4
2.4 Transfer Switch Data Decal .......................... 4
2.5 Transfer Switch Enclosure ........................... 4
2.6 Safe Use of Transfer Switch ......................... 4
2.7 Load Management Options .......................... 4
2.7.1 Smart A/C Module .............................................. 4
4.5 Checking Automatic Operation ................. 13
4.6 Installation Summary .................................. 13
4.7 Shutting Generator Down While Under Load 13
4.8 Testing The Smart A/C Module .................. 14
4.9 Testing The Smart Management Module .. 14
2.7.2 Smart Management Module (Optional) .............. 5
2.7.3 Load Management Analysis ............................... 5
Section 5 Drawings and Diagrams
5.1 Installation Drawing .................................... 15
Section 3 Installation
3.1 Introduction to Installation ........................... 7
5.1.1 No. 0K2436-A
300-400A Non-Service Entrance Rated ........... 15
3.2 Mounting ........................................................ 7
5.1.2 No. 0K2438-A
300-400A Service Entrance Rated ................... 16
3.3 Connecting Power Source and Load Lines 7
5.2 Interconnection Drawing ............................ 18
3.4 Connecting Start Circuit Wires .................... 7
5.2.1 No. 0L3239-A (Part 1 of 4)
Liquid-cooled Generator ................................... 18
3.5 Connecting Smart A/C Module ..................... 8
3.5.1 Control of Air Conditioner Load .......................... 8
3.6 Auxiliary Contacts ......................................... 9
5.2.2 No. 0L3239-A (Part 2 of 4)
Liquid-cooled Generator ................................... 19
5.2.3 No. 0L3239-A (Part 3 of 4)
Air-cooled Generator ........................................ 20
5.2.4 No. 0L3239-A (Part 4 of 4)
Air-cooled Generator ........................................ 21
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iii
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Automatic Transfer Switch Owner’s Manual
Safety
Section 1
Safety
1.1 — General
Read the following information carefully before
attempting to install, operate or service this
equipment. Also read the instructions and
information on tags, decals, and labels that may be
affixed to the transfer switch. Replace any decal or
label that is no longer legible.
These safety warnings cannot eliminate the hazards
that they indicate. Common sense and strict
compliance with the special instructions while
performing the action or service are essential to
preventing accidents.
1.2 — General Hazards
• Any AC generator that is used for backup power if
WARNING
Consult Manual. Read and understand manual
completely before using product. Failure to
completely understand manual and product
could result in death or serious injury. (000100a)
The manufacturer cannot anticipate every possible
circumstance that might involve a hazard. The
warnings in this manual, and on tags and decals
affixed to the unit are not all-inclusive. If using a
procedure, work method or operating technique the
manufacturer does not specifically recommend,
ensure that it is safe. Also make sure the procedure,
work method or operating technique used does not
render the transfer switch unsafe.
Throughout this publication, and on tags and decals
affixed to the generator, DANGER, WARNING,
CAUTION and NOTE blocks are used to alert
personnel to special instructions about a particular
operation that may be hazardous if performed
incorrectly or carelessly. Observe them carefully.
Their definitions are as follows:
DANGER
a NORMAL (UTILITY) power source failure occurs,
must be isolated from the NORMAL (UTILITY)
power source by means of an approved transfer
switch. Failure to properly isolate the NORMAL
and STANDBY power sources from each other
may result in injury or death to electric utility
workers, due to backfeed of electrical energy.
• Improper or unauthorized installation, operation,
service or repair of the equipment is extremely
dangerous and may result in death, serious
personal injury, or damage to equipment and/or
personal property.
• Extremely high power and dangerous voltages are
present inside an installed transfer switch. Any
contact with high voltage terminals, contacts or
wires can result in LETHAL electric shock, while
arc flash can cause blindness and severe burns.
DO NOT WORK ON THE TRANSFER SWITCH
UNTIL ALL POWER SUPPLIES TO THE SWITCH
HAVE BEEN POSITIVELY TURNED OFF.
• Competent, qualified personnel should install,
Indicates a hazardous situation which, if not avoided, will
result in death or serious injury.
(000001)
WARNING
Indicates a hazardous situation which, if not avoided,
could result in death or serious injury.
(000002)
operate and service this equipment. Adhere strictly
to local, state and national electrical and building
codes. When using this equipment, comply with
regulations the National Electrical Code (NEC),
CSA Standard; C22.1 Canadian Electric Code and
Occupational Safety and Health Administration
(OSHA) have established.
• Never handle any kind of electrical device while
standing in water, while barefoot, or while hands or
feet are wet. DANGEROUS ELECTRICAL SHOCK
MAY RESULT.
• Because jewelry conducts electricity, wearing it
CAUTION
Indicates a hazardous situation which, if not avoided,
could result in minor or moderate injury.
may cause dangerous electrical shock. Remove all
jewelry (such as rings, watches, bracelets, etc.)
before working on this equipment.
• If working on this equipment while standing on
(000003)
NOTE:
Notes contain additional information important to a
procedure and will be found within the regular text of
this manual.
Automatic Transfer Switch Owner’s Manual
metal or concrete, place insulative mats over a dry
wood platform. Work on this equipment only while
standing on such insulative mats.
• Never work on this equipment while physically or
mentally fatigued.
1
Safety
• Keep the transfer switch enclosure door closed
and bolted at all times. Only qualified personnel
should be permitted access to the switch interior.
• In case of an accident caused by electric shock,
immediately shut down the source of electrical
power. If this is not possible, attempt to free the
victim from the live conductor but AVOID DIRECT
CONTACT WITH THE VICTIM. Use a
nonconducting implement, such as a dry rope or
board, to free the victim from the live conductor. If
the victim is unconscious, apply first aid and get
immediate medical help.
2
• When an automatic transfer switch is installed for a
standby generator set, the generator engine may
crank and start at any time without warning. To
avoid possible injury that might be caused by such
sudden start-ups, the system’s automatic start
circuit must be disabled before working on or
around the generator or transfer switch. Then
place a “DO NOT OPERATE” tag on the transfer
switch and on the generator.
• Any voltage measurements should be performed
with a meter that meets UL3111 safety standards,
and meets or exceeds overvoltage class CAT III.
Automatic Transfer Switch Owner’s Manual
General Information
Section 2
General Information
2.1 — Introduction
Thank you for purchasing a Generac transfer switch. This
manual has been prepared especially for the purpose of
familiarizing personnel with the design, application,
installation, operation and servicing of the applicable
equipment. Read this manual carefully and comply with
all instructions. This will help to prevent accidents or
damage to equipment that might otherwise be caused by
carelessness, incorrect application, or improper
procedures.
The conductor size range is as follows:
Switch
Rating
Wire Range
Conductor
Torque Specification
300/400A
(1) #4-600 MCM
(Cu/Al)
or
(2) 1/0-250 MCM
(Cu/Al)
375 in-lbs (42.4 Nm)
Every effort has been expended to make sure that the
contents of this manual are both accurate and current.
The manufacturer, however, reserves the right to change,
alter or otherwise improve the product or manual at any
time without prior notice.
This transfer switch is suitable for control of motors,
electric discharge lamps, tungsten filament and electric
heating equipment where the sum of motor full load
ampere ratings and the ampere ratings of other loads do
not exceed the ampere rating of the switch and the
tungsten load does not exceed 30 percent of the switch
rating.
2.2 — Unpacking
This UL listed transfer switch is for use in optional
standby systems only (NEC article 702).
Carefully unpack the transfer switch. Inspect closely for
any damage that might have occurred during shipment.
The purchaser must file with the carrier any claims for
loss or damage incurred while in transit.
This transfer switch is suitable for use on a circuit
capable of 22,000 rms symmetrical amperes, 240 VAC
maximum.
A
Check that all packing material is completely removed
from the switch prior to installation.
2.3 — Equipment Description
The automatic transfer switch is used for transferring
electrical load from a UTILITY (NORMAL) power source
to a GENERATOR (STANDBY) power source. Such a
transfer of electrical loads occurs automatically when the
UTILITY power source has failed or is substantially
reduced and the GENERATOR source voltage and
frequency have reached an acceptable level. The
transfer switch prevents electrical feedback between two
different power sources (such as the UTILITY and
GENERATOR sources) and, for that reason, codes
require it in all standby electric system installations.
B
The transfer switch consists of a transfer mechanism,
utility service disconnect circuit breaker (if equipped), a
control relay, a Smart A/C module, fuses, terminal strip,
and fuse holder for connection of sensing wires.
This transfer switch is suitable for use as service
equipment if equipped with utility service circuit breaker.
2.3.1— Transfer Switch Mechanism
These switches (Figure 2-1) are used with a single-phase
system, when the single-phase NEUTRAL line is to be
connected to a neutral lug and is not to be switched.
Solderless, screw-type terminal lugs are standard.
Automatic Transfer Switch Owner’s Manual
000218
C
Figure 2-1. Typical Single-Phase ATS
Transfer Mechanism
A
Utility Lugs (N1 & N2)
B
Generator Lugs (E1 & E2)
C
Load Lugs (T1 & T2)
3
General Information
2.3.2— Utility Service Circuit Breaker (if
equipped)
The utility service circuit breakers for the 300/400 amp
models are:
Generac, 300/400AF
• 120/240VAC, 300/400A
• 50/60 Hertz
• Wire range: (1) #4-600 MCM or (2) 1/0-250 MCM
(Cu/Al)
• The conductor torque specification is 375 in-lbs.
(42.4 Nm).
Siemens, JD63B300P, JD63B400P (Siemens models
only)
• 300/400A, 3-pole, 600 Volt
• 50/60 Hertz
• Wire range: Cables per lug (1-2); 3/0-500 MCM; 4/
0-500 MCM (Cu/Al)
• See the circuit breaker markings for the conductor
torque specification.
2.4 — Transfer Switch Data Decal
A data decal is permanently affixed to the transfer switch
enclosure. Use this transfer switch only with the specific
limits shown on the data decal and on other decals and
labels that may be affixed to the switch. This will prevent
damage to equipment and property.
When requesting information or ordering parts for this
equipment, make sure to include all information from the
data decal.
For future reference, record the Model and Serial
numbers in the space provided on the front cover of this
manual
2.5 — Transfer Switch Enclosure
The standard switch enclosure is a National Electrical
Manufacturer’s Association (NEMA) and UL 3R type. UL
and NEMA 3R (indoor/outdoor rated) type enclosures
primarily provide a degree of protection against falling
rain and sleet; are undamaged by the formation of ice on
the enclosure.
2.6 — Safe Use of Transfer Switch
WARNING
Consult Manual. Read and understand manual
completely before using product. Failure to
completely understand manual and product
could result in death or serious injury. (000100a)
Before installing, operating or servicing this equipment,
read the SAFETY RULES carefully. Comply strictly with
all SAFETY RULES to prevent accidents and/or damage
to the equipment. The manufacturer recommends that a
copy of the SAFETY RULES be posted near the transfer
switch. Also, be sure to read all instructions and
information found on tags, labels and decals affixed to
the equipment.
Two publications that outline the safe use of transfer
switches are the following:
• NFPA 70; National Electrical Code
• UL 1008, STANDARD FOR SAFETY-AUTOMATIC
TRANSFER SWITCHES
NOTE: It is essential to use the latest version of any
standard to ensure correct and current information.
2.7 — Load Management Options
Load management systems are designed to work
together to prevent a generator from being overloaded by
large appliance loads. A Smart A/C Module is standard in
these switches. An optional Smart Management Module
is also available.
2.7.1— Smart A/C Module
Up to four air conditioner loads can be managed by the
Smart A/C Module. The Smart A/C Module manages the
loads by “shedding” the connected loads in the event of a
drop in generator frequency (overload). Loads to be
“shed” are in 4 priority levels on the module.
Priorities A/C 1-4 (A in Figure 2-2) have connections for
an air conditioner. To control an air conditioner, no
additional equipment is required. Internal normally closed
relays interrupt the 24 VAC thermostat control signal to
disable the air conditioner load.
Four LEDs, located on the Smart A/C Module (B in
Figure 2-2), illuminate when a load is connected and
powered.
The Smart A/C Module has a test button used to simulate
an overload condition. This button operates even when
the transfer signal is inactive.
4
Automatic Transfer Switch Owner’s Manual
General Information
The Smart A/C Module can be used in conjunction with
individual Smart Management Modules (SMM) to
manage a combined total of eight loads.
0 GROUND
• Use Priorities A/C 1-4 on the Smart A/C Module as
194 +12V
23 TRANSFER
T1
the top priorities, then up to four Smart Management Modules as Priorities 5-8.
NEUTRAL
• Use only select A/C priorities on the Smart A/C
A/C 1
Module as the top priorities, then use additional
Smart Management Modules as the remaining priorities.
A/C 2
A
A/C 1
B
A/C 2
• A Smart Management Module can share a priority
with an A/C priority on the Smart A/C Module provided the generator is sized to handle the combined surge load from both appliances. Sharing
priorities can allow up to 12 loads to be managed in
a properly sized system.
A/C 3
A/C 3
A/C 4
A/C 4
000802
Figure 2-2. Smart A/C Module
In any combination of modules, the recovery times after a
loss of utility power or shutdown due to overload are
shown in Table 1.
Table 1. Priority Settings
2.7.2— Smart Management Module
(Sold Separately))
Any loads, including central air conditioners, can be
managed using a Smart Management Module (SMM).
The system can accommodate up to eight individual
SMM modules.
NOTE: The SMM modules are self-contained and have
individual built-in controllers.
Priority
Recovery Time
Smart A/C
Module
Smart
Management
Module
1
5 minutes
Yes
Yes
2
5 minutes 15 seconds
Yes
Yes
3
5 minutes 30 seconds
Yes
Yes
4
5 minutes 45 seconds
Yes
Yes
5
6 minutes
NA
Yes
6
6 minutes 15 seconds
NA
Yes
7
6 minutes 30 seconds
NA
Yes
8
6 minutes 45 seconds
NA
Yes
Refer to the SMM Owner’s/Installation Manual for
detailed characteristics and specifications of that product.
000106
Figure 2-3. Smart Management Module
2.7.3— Application Considerations
Generator overload condition is determined by generator
frequency. Loads are shed when frequency is less than
58 Hz for three seconds or less than 50 Hz for ½ second
(for 60 Hz systems).
Automatic Transfer Switch Owner’s Manual
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General Information
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6
Automatic Transfer Switch Owner’s Manual
Installation
Section 3
Installation
3.1 — Introduction to Installation
This equipment has been wired and tested at the factory.
Installing the switch includes the following procedures:
•
•
•
•
•
Mounting the enclosure.
Connecting power source and load leads.
Connecting the generator start and sensing circuit.
Connecting any auxiliary contact (if needed).
Testing functions.
3.2 — Mounting
Mounting dimensions for the transfer switch enclosure
are in this manual. Enclosures are typically wallmounted. See the “Installation Diagram” section.
DANGER
Equipment malfunction. Installing a dirty or damaged
transfer switch will cause equipment malfunction and
will result in death or serious injury.
(000119)
This transfer switch is mounted in a UL type 3R
enclosure. It can be mounted outside or inside and
should be based on the layout of installation,
convenience and proximity to the utility supply and load
center.
Install the transfer switch as close as possible to the
electrical loads that are to be connected to it. Mount the
switch vertically to a rigid supporting structure. To prevent
switch distortion, level all mounting points. If necessary,
use washers behind mounting holes to level the unit.
3.3 — Connecting Power Source and
Load Lines
DANGER
Electrocution. Turn utility and emergency
power supplies to OFF before connecting power
source and load lines. Failure to do so will result
in death or serious injury.
(000116)
Installation and interconnection diagrams are provided in
this manual.
NOTE: All installations must comply with national, state
and local codes. It is the responsibility of the installer to
perform an installation that will pass the final electrical
inspection.
Automatic Transfer Switch Owner’s Manual
The utility supply connection is made at the utility service
disconnect circuit breaker terminals. The generator and
customer load connections are made at the transfer
switch mechanism, inside the switch enclosure.
Conductor sizes must be adequate to handle the
maximum current to which they will be subjected, based
on the 75°C column of tables, charts, etc. used to size
conductors. The installation must comply fully with all
applicable codes, standards and regulations.
All power cables can enter the enclosure through the
knockouts provided. If not using the knockouts, conduit
entry into the enclosure above the level of uninsulated
live parts shall use fittings listed for use in wet locations
to maintain the Type 3R rating. Conduits should be
arranged to provide separation between the Utility and
Generator supply conductors inside the enclosure.
NOTE: If aluminum conductors are used, apply corrosion
inhibitor to conductors. After tightening terminal lugs,
carefully wipe away any excess corrosion inhibitor.
Tighten terminal lugs to the torque values as noted on the
decal located on the inside of the door. After tightening
terminal lugs, carefully wipe away any excess corrosion
inhibitor.
CAUTION
Equipment damage. Verify all conductors are tightened
to the factory specified torque value. Failure to do so
could result in damage to the switch base.
(000120)
Connect power source and load conductors to clearly
marked terminal lugs on transfer mechanism as follows:
1.
Connect utility (normal) power source cables to
utility service disconnect circuit breaker if
equipped, or N1 and N2 lugs of the transfer switch.
See Figure 2-1.
2.
Connect the generator (standby) source power
cables to transfer switch terminals E1, E2.
3.
Connect customer LOAD leads to switch terminals
T1, T2.
3.4 — Connecting Start Circuit Wires
Control system interconnections may consist of N1, N2,
and T1, and leads 23 and 194. The generator control
wiring is a Class 1 signaling circuit. Reference instruction
manual of specific engine generator for wiring connection
details. Recommended wire gauge sizes for this wiring
depends on the length of the wire, as recommended in
the following chart:
7
Installation
3.5.1— Control of Air Conditioner Load
Maximum Wire Length
Recommended Wire Size
1-115 ft (1-35m)
No. 18 AWG.
116-185 ft (36-56m)
No. 16 AWG.
186-295 ft (57-89m)
No. 14 AWG.
296-460 ft (90-140m)
No. 12 AWG.
Exception: Conductors of AC and DC circuits, rated
1000 volts nominal, or less, shall be permitted to occupy
the same equipment, cable, or conduit. All conductors
shall have an insulation rating equal to at least the
maximum circuit voltage applied to any conductor within
the equipment, cable, or conduit. See NEC 300.3(C)(1).
3.5 — Connecting Smart A/C Module
The Smart A/C Module can control an air conditioner (24
VAC) directly. See Figure 3.1.
1.
Route the thermostat cable (from the furnace/thermostat to the outdoor air conditioner unit) to the
transfer switch.
2.
Connect the wire to the terminal strip terminals (A/
C 1) on the Smart A/C Module as shown in Figure
3.1. These are normally closed contacts which
open upon load shed conditions. Route thermostat
wire away from high voltage wires.
3.
If required, connect additional air conditioners to
the terminal strip terminals (A/C 2-4).
Contact Ratings
A/C 1-4
24 VAC, 1.0 Amp Max
NOTE: These instructions are for a typical air conditioner
installation. Control of certain heat pumps and 2-stage air
conditioners may require special connections or the use
of Smart Management Modules (SMM) to control the
loads.
THERMOSTAT 1
0 GROUND
194 +12V
T1
23 TRANSFER
00 NEUTRAL
AIR
CONDITIONER 1
A/C 1
THERMOSTAT 2
AIR
CONDITIONER 2
A/C 2
A/C 1
A/C 2
THERMOSTAT 3
A/C 3
A/C 3
A/C 4
A/C 4
THERMOSTAT 4
AIR
CONDITIONER 3
AIR
CONDITIONER 4
000803
Figure 3-1. Typical Smart A/C Connections
8
Automatic Transfer Switch Owner’s Manual
Installation
3.6 — Auxiliary Contacts
If desired, there are Auxiliary Contacts on the transfer
switch to operate customer accessories, remote advisory
lights, or remote annunciator devices. A suitable power
source must be connected to the common terminal (D).
See Figure 3-2.
Contact operation is shown in the following chart:
Switch Position
Utility
Standby
Common to Normally Open
Open
Closed
Common to Normally Closed
Closed
Open
NOTE: Auxiliary Contacts are rated 10 amps at 125 or
250 volts AC.
CAUTION
Equipment damage. Exceeding rated voltage and
current will result in damage to the auxiliary contacts.
(000134)
A
B
D
C
E
F
000140
Figure 3-2. Auxiliary Contacts
A
Auxiliary Contact (Actuated)
B
Auxiliary Contact (Non-Actuated)
C
Single Contact (Utility Position)
D
Common Terminal
E
Normally Open Terminal
F
Normally Closed Terminal
Automatic Transfer Switch Owner’s Manual
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Installation
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10
Automatic Transfer Switch Owner’s Manual
Operation
Section 4
Operation
4.1 — Functional Tests and
Adjustments
Following transfer switch installation and interconnection,
inspect the entire installation carefully. A competent,
qualified electrician should inspect it. The installation
should comply strictly with all applicable codes, standards, and regulations. When absolutely certain the
installation is proper and correct, complete a functional
test of the system.
CAUTION
Equipment damage. Perform functional tests in the
exact order they are presented in the manual. Failure
to do so could result in equipment damage.
(000121)
IMPORTANT: Before proceeding with functional
tests, read and make sure all instructions and information in this section is understood. Also read the
information and instructions of labels and decals
affixed to the switch. Note any options or accessories that might be installed and review their operation.
4.2 — Manual Operation
DANGER
Electrocution. Do not manually transfer under load.
Disconnect transfer switch from all power sources
prior to manual transfer. Failure to do so will result
in death or serious injury, and equipment damage.
(000132)
A manual handle is shipped with the transfer switch. See
1 in Figure 4-1. Manual operation must be checked
BEFORE the transfer switch is operated electrically. To
check manual operation, proceed as follows:
1.
Ensure the generator is in the OFF mode.
2.
Turn OFF or OPEN both UTLITY and EMERGENCY power supplies to the transfer switch, with
whatever means provided (such as the main line
circuit breakers).
3.
• Window “A” OFF, Window “B” ON - LOAD terminals (T1, T2) are connected to emergency terminals (E1, E2).
CAUTION
Equipment damage. Do not use excessive force
while manually operating the transfer switch.
Doing so could result in equipment damage.
(000122)
4.2.1— Close to Normal Source Side
Before proceeding, verify the position of the switch by
observing Window “A” in Figure 4-1. If Window “A” reads
“ON”, the contacts are closed in the normal position, no
further action is required. If it reads “OFF”, proceed as
follows:
• Attach handle attached to actuating shaft (see 2 in
Figure 4-1). Move handle in the direction of the
arrow on the switch cover until it stops — DO NOT
FORCE. Release handle slowly to allow the spring
in the switch box to relax. “ON” now appears in
Window “A” and “OFF” appears in Window “B”.
4.2.2— Close to Standby Source Side
Before proceeding, verify the position of the switch by
observing Window “B” in Figure 4-1. If Window “B” reads
“ON”, the contacts are closed in the EMERGENCY
(STANDBY) position. No further action is required. If it
reads “OFF”, proceed as follows:
• Attach handle to actuating shaft (see 2 in Figure 41). Move the handle in the direction of the arrow on
the switch cover until it stops - DO NOT FORCE.
Release handle slowly to allow the spring in the
switch box to relax. “OFF” now appears in Window
“A” and “ON” appears in Window “B”.
4.2.3— Return to Normal Source Side
Manually actuate switch to return Window “A” to the “ON”
position.
Note position of transfer mechanism main contacts
by observing display windows in “A” and “B” (3 and
4 in Figure 4-1) as follows:
• Window “A” ON, Window “B” OFF - LOAD terminals (T1, T2) are connected to utility terminals (N1,
N2).
Automatic Transfer Switch Owner’s Manual
11
Operation
3
2
4
1
000141
Figure 4-1. Actuating Transfer Switch
4.3 — Voltage Checks
4.3.2— Generator Voltage Checks
1.
On the generator panel, select the MANUAL mode
of operation. The generator should crank and start.
2.
Let the generator stabilize and warm up at no-load
for at least five minutes.
3.
Set the generator main circuit breaker (CB1) to ON
or CLOSED.
4.3.1— Utility Voltage Checks
1.
Turn ON the UTILITY power supply to the transfer
switch with whatever means provided (such as the
UTILITY main line circuit breaker).
DANGER
DANGER
Electrocution. High voltage is present at transfer
switch and terminals. Contact with live terminals
will result in death or serious injury.
(000129)
2.
With an accurate AC voltmeter, check for correct
voltage. Measure across ATS terminal lugs N1 and
N2; N1 to NEUTRAL and N2 to NEUTRAL.
DANGER
Electrocution. Turn utility supply OFF before
working on utility connections of the transfer
switch. Failure to do so will result in
death or serious injury.
(000123)
12
Electrocution. High voltage is present at transfer
switch and terminals. Contact with live terminals
will result in death or serious injury.
(000129)
4.
With an accurate AC voltmeter and frequency
meter, check the no-load, voltage and frequency.
Measure across ATS terminal lugs E1 to E2; E1 to
NEUTRAL and E2 to NEUTRAL.
Frequency
60-62 Hz
Terminals E1 to E2
240-246 VAC
Terminals E1 to NEUTRAL
120-123 VAC
Terminals E2 to NEUTRAL
120-123 VAC
Automatic Transfer Switch Owner’s Manual
Operation
5.
When certain that generator supply voltage is correct and compatible with transfer switch ratings,
turn OFF the generator supply to the transfer
switch.
6.
Set the generator main circuit breaker (CB1) to
OFF or OPEN.
7.
On the generator panel, select the OFF mode to
shut down the generator.
NOTE: Do NOT proceed until generator AC output
voltage and frequency are correct and within stated
limits. If the no-load voltage is correct but no-load
frequency is incorrect, the engine governed speed
may require adjustment. If no-load frequency is correct but voltage is not, the voltage regulator may
require adjustment.
4.4 — Generator Tests Under Load
1.
Turn OFF the utility power supply to the transfer
switch with whatever means provided (such as the
utility main line circuit breaker).
2.
Set the generator main circuit breaker to OFF or
OPEN.
3.
Manually actuate the transfer switch main contacts
to the emergency (Standby) position. See “Manual
Operation”.
4.
To start the generator, select the MANUAL mode of
operation. When engine starts, let it stabilize for a
few minutes.
5.
Set the generator main circuit breaker to ON or
CLOSED. The generator now powers all LOAD circuits. Check generator operation under load as follows:
• Turn on electrical loads to the full rated wattage/
amperage capacity of the generator. DO NOT
OVERLOAD.
• With maximum rated load applied, check voltage
and frequency across transfer switch terminals E1
and E2. Voltage should be greater than 230 volts
(240 VAC system); frequency should be greater
than 59 Hz.
• Let the generator run under rated load for at least
30 minutes. With unit running, listen for unusual
noises, vibration, overheating, etc., that might indicate a problem.
6.
When checkout under load is complete, set main
circuit breaker of the generator to the OFF or
OPEN position.
7.
Let the generator run at no-load for several minutes. Then, shut down by selecting the OFF mode.
8.
Move the main switch contacts back to UTILITY.
Automatic Transfer Switch Owner’s Manual
NOTE: See “Manual Operation”. Handle and operating
lever of transfer switch should be in down position.
9.
Turn on the utility power supply to transfer switch,
using whatever means provided (such as a utility
main line circuit breaker). The utility power source
now powers the loads.
10.
The system is now set for fully automatic operation.
4.5 — Checking Automatic Operation
To check the system for proper automatic operation, proceed as follows:
1.
Verify generator is in OFF mode.
2.
Install front cover of the transfer switch.
3.
Turn the utility power supply to the transfer switch
ON, using the utility main line circuit breaker.
4.
Set the generator main circuit breaker to ON.
5.
On the generator panel, select AUTO. The system
is now ready for automatic operation.
6.
Turn utility power supply to the transfer switch OFF.
With the generator ready for automatic operation, the
engine should crank and start when the utility source
power is turned OFF after a ten second delay (factory
default setting). After starting, the transfer switch should
connect load circuits to the standby side after a five (5)
second delay. Let the system operate through its entire
automatic sequence of operation.
4.6 — Installation Summary
1.
Verify the installation has been properly performed
as outlined by the manufacturer and that it meets
all applicable laws and codes.
2.
Verify proper operation of the system as outlined in
the appropriate installation and owner’s manuals.
3.
Educate the end-user on the proper operation,
maintenance and service call procedures.
4.7 — Shutting Generator Down While
Under Load
Important! To turn the generator off during utility
outages to perform maintenance, or conserve fuel,
follow these steps:
To turn the generator OFF (while running in AUTO and
online):
1.
Turn the main utility disconnect OFF.
2.
Turn the main line circuit breaker (MLCB) on the
generator to OFF (OPEN).
3.
Let the generator run at no-load several minutes.
4.
Turn the generator OFF.
13
Operation
To turn the generator back ON:
1.
Put the generator back into AUTO and allow to
start and warm-up for a few minutes.
2.
Set the MLCB on the generator to ON.
4.9 — Testing The Smart Management
Module
Refer to the SMM Owner’s/Installation Manual for testing
that product.
The system will now be operating in automatic mode.
The main utility disconnect can be turned ON (CLOSED).
If Utility returns, the transfer switch will return to utility
mode and the generator will cycle off after it times out.
4.8 — Testing The Smart A/C Module
A Test pushbutton is provided on the bottom of the Smart
A/C Module to test the operation of the load shed
functions. The Test button will work when the ATS is in
the Utility or the Generator position.
1.
Turn on the Utility supply to the ATS.
2.
Verify managed loads are powered and all LEDs
illuminate on Smart A/C Module.
3.
Press the TEST button on the Smart A/C Module.
4.
Verify that all of the connected loads to be “shed”
become disabled.
5.
After five (5) minutes verify A/C 1 is energized and
Status LED A/C 1 is ON.
6.
After another 15 seconds, verify A/C 2 is energized
and Status LED A/C 2 is ON.
7.
After another 15 seconds, verify Load A/C 3 is
energized and Status LED Load A/C 3 is ON.
8.
After another 15 seconds, verify A/C 4 is energized
and Status LED A/C 4 is ON.
14
Automatic Transfer Switch Owner’s Manual
Automatic Transfer Switch Owner’s Manual
TRIPLE EKO SUITABLE
FOR 1", 1.25" & 1.50" CONDUIT
3 PLACES
609.6mm [24.0"]
PADLOCK
(CUSTOMER SUPPLIED)
LOCATION
4.02mm [0.2"]
60.7mm [2.4"]
794mm [31.3"]
59.8mm [2.4"]
Ø14mm [Ø0.6"]
7.48mm [0.3"]
Ø8mm [Ø0.3"]
Section 5
254mm [10.0"]
917mm [36.1"]
487mm [19.2"]
2" EKO
Ø62.7 (2.47")
Drawings and Diagrams
Drawings and Diagrams
5.1 — Installation Drawing
5.1.1— No. 0K2436-A 300-400A Non-Service Entrance Rated
15
16
255.5mm [10.06"]
268.35mm [10.56"]
1219.3mm [48.00"]
62.0mm [2.44"]
554.3mm [21.82"]
PADLOCK
(CUSTOMER SUPPLIED)
LOCATION
424.0mm [16.69"]
571.5mm [22.50"]
1090.0mm [42.91"]
ĵ14mm [ĵ0.6"]
63.0mm [2.48"]
FOR FURTHER DETAILS SEE
INTERCONNECTION DIAGRAM IN THIS MANUAL.
NOTE:
FOR 3R RATINGS CONDUITS MUST
ENTER BELOW ENERGIZED COMPONENTS
4.02mm [0.2"]
7.48mm [0.3"]
ĵ8mm [ĵ0.3"]
Drawings and Diagrams
5.1.2— No. 0K2438-A 300-400A Service Entrance Rated
Automatic Transfer Switch Owner’s Manual
Drawings and Diagrams
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Automatic Transfer Switch Owner’s Manual
17
Drawings and Diagrams
5.2 — Interconnection Drawing
5.2.1— No. 0L3239-A (Part 1 of 4) Liquid-cooled Generator
18
Automatic Transfer Switch Owner’s Manual
Drawings and Diagrams
5.2.2— No. 0L3239-A (Part 2 of 4) Liquid-cooled Generator
Automatic Transfer Switch Owner’s Manual
19
Drawings and Diagrams
5.2.3— No. 0L3239-A (Part 3 of 4) Air-cooled Generator
20
Automatic Transfer Switch Owner’s Manual
Drawings and Diagrams
5.2.4— No. 0L3239-A (Part 4 of 4) Air-cooled Generator
Automatic Transfer Switch Owner’s Manual
21
Drawings and Diagrams
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22
Automatic Transfer Switch Owner’s Manual
Part No. 0L3203 Rev. A 05/20/15 Printed in USA
©2015 Generac Power Systems, Inc. All rights reserved
Specifications are subject to change without notice.
No reproduction allowed in any form without prior written
consent from Generac Power Systems, Inc.
Generac Power Systems, Inc.
S45 W29290 Hwy. 59
Waukesha, WI 53189
1-888-GENERAC (1-888-436-3722)
generac.com