Page 1
Owner’s Manual
003722
For
Automatic Transfer Switch
200 Amp, Single Phase, 240 VAC, Service Rated, 8–16 Circuit Load Center
Model Number
RXSW200A3F
SERIAL NUMBER: _________________________
DATE PURCHASED:________________________
WWW.GENERAC.COM
888-436-3722
Para español , visita:
Pour le français, visiter : http://www.generac.com/service-support/product-support-lookup
http://www.generac.com/service-support/product-support-lookup
SAVE THIS MANUAL FOR FUTURE REFERENCE
Page 2
(000005)
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.
(000004)
WARNING
California Proposition 65. Engine exhaust and some
of its constituents are known to the state of California
to cause cancer, birth defects, and other reproductive
harm.
ii Automatic Transfer Switch Owner’s Manual
Page 3
Table of Contents
Section 1: Safety
Introduction ..........................................................1
Safety Rules .........................................................1
Safety Symbols and Meanings ...........................1
Electrical Hazards ................................................2
General Hazards ..................................................3
Section 2: Installation
Introduction to Installation .................................5
Mounting ...............................................................5
Open Enclosure ...................................................5
Install Breakers ....................................................6
Installing Branch Circuit Conductors ................6
Connecting Power Source and Generator
Power Supply .................................................6
Connecting Start Circuit Wires ...........................7
Section 4: Drawings and Diagrams
Installation Drawing .......................................... 15
No. 10000007892 ......................................................15
Interconnection Drawing .................................. 16
No. 10000017951—Sheet 1 of 4
(Liquid-Cooled Engine Generator) ...................16
No. 10000017951—Sheet 2 of 4
(Liquid-Cooled Engine Generator) ...................17
No. 1 0000017 951—She e t 3 of 4
(Air-Cooled Engine Generator) .........................18
No. 10000017951—Sheet 4 of 4
(Air-Cooled Engine Generator) ........................19
Connecting SACM ...............................................7
Control of Air Conditioner Load ...................................7
Auxiliary Contact .................................................8
Fault Current Label ..............................................9
Section 3: Operation
Functional Tests and Adjustments ..................11
Manual Operation ..............................................11
Close to Utility Source Side .......................................11
Close to Generator Source Side ...............................12
Return to Utility Source Side .....................................12
Voltage Checks ..................................................12
Utility Voltage Checks ...............................................12
Generator Voltage Checks ........................................12
Generator Tests Under Load ............................12
Checking Automatic Operation ........................13
Installation Summary ........................................13
Shutting Generator Down While Under Load ..13
Shutting Generator Down To Perform
Maintenance .................................................14
Testing The SACM .............................................14
Testing The SMM ...............................................14
Fuse Removal and Installation .........................14
Automatic Transfer Switch Owner’s Manual iii
Page 4
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iv Automatic Transfer Switch Owner’s Manual
Page 5
Section 1: Safety
(000100a)
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.
(000001)
DANGER
Indicates a hazardous situation which, if not avoided,
will result in death or serious injury.
(000002)
WARNING
Indicates a hazardous situation which, if not avoided,
could result in death or serious injury.
(000003)
CAUTION
Indicates a hazardous situation which, if not avoided,
could result in minor or moderate injury.
Safety
Introduction
Thank you for purchasing a Generac Power Systems Inc.
product. This unit has been designed to provide high
performance, efficient operation, and years of use when
maintained properly.
Read this manual thoroughly and understand all of the
instructions, cautions, and warnings before using this
equipment. If any section of the manual is not
understood, contact your nearest authorized dealer, or
contact Generac Customer Service at 1-888-436-3722
(1-888-GENERAC), or www.generac.com with any
questions or concerns.
The owner is responsible for proper maintenance and
safe use of the equipment. Before operating or servicing
this transfer switch:
• Study all warnings in this manual and on the
product carefully.
• Become familiar with this manual and the unit
before use.
• Refer to the installation sections of the manual for
instructions on final assembly procedures. Follow
the instructions completely.
Save these instructions for future reference. ALWAYS
supply this manual to any individual that will use this
equipment.
The information in this manual is accurate based on
products produced at the time of publication. The
manufacturer reserves the right to make technical
updates, corrections, and product revisions at any time
without notice.
Safety Rules
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, therefore, not all inclusive. If using a procedure, work
method or operating technique that the manufacturer
does not specifically recommend, verify that it is safe for
others. Also make sure the procedure, work method or
operating technique utilized does not render the
equipment unsafe.
Safety Symbols and Meanings
Throughout this publication, and on tags and decals
affixed to the transfer switch, 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:
Automatic Transfer Switch Owner’s Manual 1
NOTE: Notes contain additional information important to
a procedure and will be found within the regular text of
this manual.
These safety alerts 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.
Page 6
Safety
(000129)
DANGER
Electrocution. High voltage is present at
transfer switch and terminals. Contact with live
terminals will result in death or serious injury.
(000104)
DANGER
Electrocution. Water contact with a power
source, if not avoided, will result in death
or serious injury.
(000145)
DANGER
Electrocution. In the event of electrical accident,
immediately shut power OFF. Use non-conductive
implements to free victim from live conductor. Apply
first aid and get medical help. Failure to do so will
result in death or serious injury.
(000237)
DANGER
Electrical backfeed. Use only approved switchgear to
isolate generator from the normal power source.
Failure to do so will result in death, serious injury,
and equipment damage.
(000195)
DANGER
Electrocution, equipment and property damage.
Handle transfer switches carefully when installing.
Never install a damaged transfer switch. Doing so
could result in death or serious injury, equipment
and property damage.
(000123)
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.
(000157)
DANGER
Electrocution. Do not disable or modify the
connection box door safety switch. Doing so
will result in death or serious injury.
Automatic start-up. Disconnect utility power and
render unit inoperable before working on unit.
Failure to do so will result in death or serious injury.
(000191)
DANGER
(000119)
Equipment malfunction. Installing a dirty or damaged
transfer switch will cause equipment malfunction and
will result in death or serious injury.
DANGER
(000155a)
WARNING
Electric shock. Only a trained and licensed electrician
should perform wiring and connections to unit. Failure
to follow proper installation requirements could result in
death, serious injury, and equipment or property damage.
(000120)
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.
(000121)
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.
(000134a)
CAUTION
Equipment damage. Exceeding rated voltage and
current will damage the auxiliary contacts. Verify
that voltage and current are within specification
before energizing this equipment.
Electrical Hazards
2 Automatic Transfer Switch Owner’s Manual
Page 7
General Hazards
(000237)
DANGER
Electrical backfeed. Use only approved switchgear to
isolate generator from the normal power source.
Failure to do so will result in death, serious injury,
and equipment damage.
(000129)
DANGER
Electrocution. High voltage is present at
transfer switch and terminals. Contact with live
terminals will result in death or serious injury.
(000123)
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.
(000104)
DANGER
Electrocution. Water contact with a power
source, if not avoided, will result in death
or serious injury.
(000188)
DANGER
Electrocution. Do not wear jewelry while
working on this equipment. Doing so will
result in death or serious injury.
(000213)
DANGER
Electrocution. Only authorized personnel should
access transfer switch interior. Transfer switch
doors should be kept closed and locked. Failure to
do so will result in death or serious injury.
Automatic start-up. Disconnect utility power and
render unit inoperable before working on unit.
Failure to do so will result in death or serious injury.
(000191)
DANGER
(000145)
DANGER
Electrocution. In the event of electrical accident,
immediately shut power OFF. Use non-conductive
implements to free victim from live conductor. Apply
first aid and get medical help. Failure to do so will
result in death or serious injury.
(000209b)
WARNING
Loss of life. This product is not intended to
be used in a critical life support application.
Failure to adhere to this warning could result
in death or serious injury.
WARNING
Equipment damage. This unit is not intended for use as a
prime power source. It is intended for use as an intermediate
power supply in the event of temporary power outage only.
Doing so could result in death, serious injury, and
equipment damage.
(000247a)
Safety
IMPORTANT NOTE: See individual unit specifications
for required maintenance and run times pertaining to
use.
• Competent, qualified personnel should install,
operate and service this equipment. Adhere strictly
to local, state and national electrical and building
codes. When using this equipment, comply with
regulations established by the National Electrical
Code (NEC), CSA Standard; the Occupational
Safety and Health Administration (OSHA), or the
local agency for workplace health and safety.
• If working on this equipment while standing on
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.
• 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 3
Page 8
Safety
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4 Automatic Transfer Switch Owner’s Manual
Page 9
Section 2: Installation
(000119)
Equipment malfunction. Installing a dirty or damaged
transfer switch will cause equipment malfunction and
will result in death or serious injury.
DANGER
C
E
B
A
D
G
F
H
J
Installation
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.
Mounting
Mounting dimensions for the transfer switch enclosure
are in this manual. Enclosures are typically wallmounted. See Drawings and Diagrams.
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.
Open Enclosure
See Figure 2-1. First, remove outer cover (A):
1. Remove two thumb screws (B).
2. Slide slot (C) over retention tab.
3. Lower cover until clear of top flange (D), and pull
away from enclosure.
Remove inner panel (E):
4. Loosen nut (F).
5. Grasp inner panel at two cutouts (G—left and
right). Tilt inner panel as shown, passing nut
through t-slot (H) in inner panel.
6. Lower inner panel until clear of two retention slots
(J—left and right sides), and pull away from
enclosure.
Automatic Transfer Switch Owner’s Manual 5
Figure 2-1. Open Enclosure
004086
Page 10
Installation
B
A
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)
DANGER
N2
E2
T2
A
T1
N1
E1
004982
Install Breakers
1. See Figure 2-2. Insert tab on each breaker (A) into
the hook on the bus (B). Push the breaker into the
bus until it snaps into place.
000362
Figure 2-2. Install Breakers
Installing Branch Circuit Conductors
1. Install properly sized branch circuit conductors into
the transfer switch through the knockouts provided.
Additional knockouts can be made in the field as
needed.
2. Connect the ungrounded branch circuit conductors
(hot conductors) to a properly sized circuit breaker
approved for use with the transfer switch.
3. Terminate the neutral conductor and equipment
grounding conductor of the branch circuit at the
neutral/equipment ground terminal bars.
4. Size all conductors, raceways, conduits, and
junction boxes, if required, to the applicable NEC
code articles and follow the NEC installation
requirements for the wiring method(s) selected.
2. Connect utility neutral and ground to the Load
Center Neutral and Ground terminals. Neutral and
Ground terminals on the Load Center are bonded
to each other with a jumper wire.
3. Connect loads to the Integrated Load Center with
customer-supplied circuit breakers.
4. See Figure 2-1 and Figure 2-3. Connect generator
to the generator terminals (E1 and E2) on the
transfer mechanism.
NOTE: Multi-wire branch circuits must be installed in
accordance with NEC Article 210.4.
Connecting Power Source and Generator Power Supply
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.
1. Connect utility supply at the utility service
disconnect circuit breaker terminals N1 and N2.
6 Automatic Transfer Switch Owner’s Manual
Figure 2-3. Wiring Connections
5. Connect the generator neutral wire to the top
neutral lug or side lugs on the panelboard.
6. Connect neutral conductors to the lugs and
terminals along the neutral/ground bars in the
panelboard section of the transfer switch.
7. Connect a maximum 200A subpanel supply to
lower T1 and T2 connections of 8-position Load
Center Terminals. Connect subpanel Neutral and
Ground to subpanel Neutral and Ground bars.
8. Connect grounding electrode conductors to the
neutral / ground terminal bars in the panelboard
portion of the switch.
Page 11
Installation
(000120)
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.
NOTE: A Neutral to Ground bonding screw (A) is
provided for use if required by local codes.
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
provided knockouts. Additional knockouts into the
transfer switch can be made in the field as needed.
Conduit entry shall maintain the proper wire bending
spaces required by Tables 312.6 (A) and (B) in the NEC.
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.
Connecting SACM
See Figure 2-4. The SACM can control an air conditioner
(24 VAC) directly.
Control of Air Conditioner Load
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 SACM as shown in Figure 2-4.
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 SMMs to control the loads.
Connecting Start Circuit Wires
Control system interconnections consist of N1, N2, and
T1, and leads 23, 194, and 9 (Ground). The connections
are color coded on the load shed to match connections in
the Generac genset. Generac cable tray cable includes
power cables with all necessary color-coded control
wiring. It is suitable for direct burial, overhead and indoor
wiring.
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:
Maximum Wire Length Recommended Wire Size
1–115 ft (1–35 m) No. 18 AWG
116–185 ft (36–56 m) No. 16 AWG
186–295 ft (57–89 m) No. 14 AWG
296–460 ft (90–140 m) 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).
Automatic Transfer Switch Owner’s Manual 7
Page 12
Installation
A
B
G
H
C
D
E
F
T1N1N2
0 GROUND
194 +12V
N1
N2
T1
23 TRANSFER
1
1
1
1
2
2
2
2
Replace with Littlefuse 021606.3MXHP,
Optifuse FCD-6.3A or
Generac 10000005117 250 vac, 6.3A
®
®
J
T1
N2
0
194
23
N1
004435
(000134a)
CAUTION
Equipment damage. Exceeding rated voltage and
current will damage the auxiliary contacts. Verify
that voltage and current are within specification
before energizing this equipment.
A
A—Thermostat 1
B—Air Conditioner 1
C—Thermostat 2
D—Air Conditioner 2
E—Thermostat 3
F—Air Conditioner 3
G—Thermostat 4
H—Air Conditioner 4
T1 (fused)—Battery Charge
(blue background, white letters)
N1 (fused)—Utility Sense
(yellow background, black letters)
Figure 2-4. Typical SACM Connections
Auxiliary Contact
See
Figure 2-5
Auxiliary Contact (A) 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. If needed, an extra
auxiliary contact can be added.
The auxiliary contact is normally closed when the transfer
switch is in utility mode. The contacts will open when the
transfer switch is in the standby power mode.
NOTE: Auxiliary Contact is rated 10 amps at 125 or 250
volts AC, and 0.6 amps at 125 volts DC.
. If desired, there is one normally-closed
N2 (fused)—Utility Sense
(yellow background with black
stripe, black letters)
0—Ground
(black background, white
letters)
194— +12 VDC
(red background, white letters)
23—Transfer Control
(white background, black
letters)
J—240 VAC, 6.3A Fuses
003626
Figure 2-5. Auxiliary Contact
8 Automatic Transfer Switch Owner’s Manual
Page 13
Fault Current Label
004496
See
Figure 2-6
provided in the bag containing the unit Owner’s Manual and
transfer switch manual operating handle. The 2017 NEC
requires that the short-circuit current rating of the transfer
equipment, based on the type of overcurrent protective
device protecting the transfer equipment, be field marked on
the exterior of the transfer equipment. For NEC compliance,
verify the required short-circuit current rating of the transfer
switch before installation.The completed label provides the
local AHJ (Authority Having Jurisdiction) with the information
he or she may require during inspection.
Apply the label to the exterior of the transfer switch
enclosure. Use a pen to fill in the required information, and
then cover the label with the clear protective decal.
. A Fault Current Identification Label is
Installation
Figure 2-6. Fault Current Label
Automatic Transfer Switch Owner’s Manual 9
Page 14
Installation
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10 Automatic Transfer Switch Owner’s Manual
Page 15
Section 3: Operation
(000121)
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.
(000132)
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.
(000122)
CAUTION
Equipment damage. Do not use excessive force while
manually operating the transfer switch. Doing so could
result in equipment damage.
003723
A
B
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.
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.
Operation
Close to Utility Source Side
Before proceeding, verify the position of the switch by
observing the position of manual operation handle in
Figure 3-1. If the handle is UP, the contacts are closed in
the utility (normal) position, no further action is required.
If the handle is DOWN, proceed with Step 1.
1. With the handle inserted into the movable contact
carrier arm, move handle UP. Be sure to hold on to
the handle as it will move quickly after the center of
travel.
2. Remove manual operating handle from movable
contact carrier arm. Return handle to storage
bracket.
Manual Operation
See Figure 3-1. A manual handle (B) is shipped with the
transfer switch manual. Manual operation must be
checked BEFORE the transfer switch is operated
electrically. To check manual operation, proceed as
follows:
1. Verify the generator is in the OFF mode.
2. Turn OFF both utility (service disconnect circuit
breaker) and emergency (generator main line
circuit breaker) power supplies to the transfer
switch.
3. Note position of transfer mechanism main contacts
(A) by observing the movable contact carrier arm.
This can be viewed through the long narrow slot in
the inside cover. The top of the movable contact
carrier arm is yellow to be easily identified.
• Manual operation handle in the UP position - LOAD
terminals (T1, T2) are connected to utility terminals
(N1, N2).
• Manual operation handle in the DOWN position -
LOAD terminals (T1, T2) are connected to
EMERGENCY terminals (E1, E2).
Automatic Transfer Switch Owner’s Manual 11
Figure 3-1. Manual Operation
Page 16
Operation
(000129)
DANGER
Electrocution. High voltage is present at
transfer switch and terminals. Contact with live
terminals will result in death or serious injury.
(000123)
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.
(000129)
DANGER
Electrocution. High voltage is present at
transfer switch and terminals. Contact with live
terminals will result in death or serious injury.
Close to Generator Source Side
Before proceeding, verify the position of the switch by
observing the position of the manual operation handle in
Figure 3-1
closed in the generator (standby) position. No further
action is required. If the handle is UP, proceed with Step 1.
1. With the handle inserted into the movable contact
2. Remove manual operating handle from movable
. If the handle is DOWN, the contacts are
carrier arm, move the handle DOWN. Be sure to
hold on to the handle as it will move quickly after
the center of travel.
contact carrier arm. Return handle to storage
bracket.
Return to Utility Source Side
1. Manually actuate switch to return manual operating
handle to the UP position.
2. Remove manual operating handle from movable
contact carrier arm. Return handle to storage
bracket.
Voltage Checks
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's main circuit breaker (CB1) to its
ON or CLOSED position.
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
NOTE: Use the Digital Multimeter (DMM) LowZ low input
impedance setting to collect accurate voltage
measurements. LowZ eliminates the possibility of
inaccurate ghost voltage readings, also known as
phantom voltage or stray voltage readings. Refer to the
DMM manufacturer’s literature for additional information.
Utility Voltage Checks
1. Turn ON the utility power supply to the transfer
switch using the utility service disconnect circuit
breaker.
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.
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.
Generator Tests Under Load
1. Set the generator main circuit breaker to OFF or
OPEN.
2. Set the utility service disconnect circuit breaker of
the transfer switch to OFF or OPEN, and turn OFF
or OPEN all load circuit breakers.
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, and close lid.
12 Automatic Transfer Switch Owner’s Manual
Page 17
Operation
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 VAC (240 VAC system);
frequency should be greater than 59 Hz.
• Verify that the gas pressure remains within
acceptable parameters (see the generator
Installation manual).
• Let the generator run under rated load for at
least 30 minutes. With unit running, watch for
unusual noises, vibration, or overheating 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 the utility
position.
second delay. Let the system operate through its entire
automatic sequence of operation.
With the generator running and loads powered by
generator AC output, set the utility service disconnect
circuit breaker of the transfer switch to ON or CLOSED.
The following should occur:
• After approximately 15 seconds, the switch should
transfer loads back to the utility power source.
• Approximately one minute after re-transfer, the
n
generator should shut dow
With the generator in the AUTOMATIC mode, the system
is now set for fully automatic operation.
.
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.
NOTE: The Utility Power Circuit Breaker in the transfer
switch must be turned OFF to simulate a utility outage.
Shutting off the main disconnect in a subpanel connected
to the transfer switch will NOT simulate an outage.
NOTE: See Manual Operation. Handle and operating
lever of transfer switch should be in down position.
9. Set the utility service disconnect circuit breaker of
the transfer switch to ON or CLOSED.
10. The system is now set for fully automatic operation.
Checking Automatic Operation
To check the system for proper automatic operation,
proceed as follows:
1. Verify generator is OFF.
2. Set the utility service disconnect circuit breaker of
the transfer switch to OFF or OPEN.
3. Verify switch is de-energized.
4. Install front cover of the transfer switch.
5. Set the utility service disconnect circuit breaker of
the transfer switch to ON or CLOSED.
6. Set the generator main circuit breaker to ON.
7. On the generator panel, select AUTO. The system
is now ready for automatic operation.
8. Set the utility service disconnect circuit breaker of
the transfer switch to OFF or OPEN.
With the generator ready for automatic operation, the
engine should crank and start when the utility source
power is turned OFF after a five second delay (factory
default setting). After starting, the transfer switch should
connect load circuits to the standby side after a five (5)
Shutting Generator Down While Under Load
IMPORTANT NOTE: To avoid equipment damage,
follow these steps, in order, when shutting the generator
down during utility outages. Shutdowns may be required
during outages to perform routine maintenance or to
conserve fuel.
To turn the generator OFF (while running in AUTO
and online):
1. Turn the main utility disconnect off.
2. Turn the generator MLCB (generator disconnect)
to OFF (OPEN).
3. Run the generator for approximately one minute for
proper cooling.
4. Turn the generator OFF.
To turn the generator back ON:
1. Put the generator into AUTO. Start generator and
warm-up for a few minutes.
2. Set the MLCB (generator disconnect) to ON
(CLOSED).
The system now operates in automatic mode. The main
utility disconnect can be turned ON (CLOSED). To shut
the unit off, repeat this complete process.
Automatic Transfer Switch Owner’s Manual 13
Page 18
Operation
005450
A
Shutting Generator Down To Perform Maintenance
1. Press the OFF mode button on the controller.
2. Turn the main utility disconnect OFF (OPEN).
3. Turn the MLCB (generator disconnect) on the
generator to OFF (OPEN) and follow maintenance
procedure(s).
To turn the generator back ON:
1. Turn the main utility disconnect ON (CLOSED).
2. Put the generator into AUTO mode.
3. Set the MLCB (generator disconnect) on the
generator to ON (CLOSED).
The system is now in automatic mode.
Testing The SACM
A Test pushbutton is provided on top of the SACM 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 SACM.
3. Press the TEST button on the SACM.
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.
Fuse Removal and Installation
See Figure 3-2. A fuse removal and installation tool (A)
is included in the control housing.
Figure 3-2. Fuse Removal and Installation Tool
If a fuse requires replacement, snap the tool free with an
appropriate tool such as diagonal pliers, and use it to
replace the fuse. The tool can be stored in the control
housing retainer directly above the fuses, with the large
thumb tab facing out.
Use only Generac replacement fuses—part number
100000005117, rated 240 VAC, 6.3 Amps, 10,000 AIC.
Alternative fuses are Littelfuse® 021606.3MXHP or
Optifuse® FCD-6.3.
Testing The SMM
Refer to the SMM Owner’s/Installation Manual for testing
procedure.
14 Automatic Transfer Switch Owner’s Manual
Page 19
Section 4: Drawings and Diagrams
4321
43 1
A
B
A
B
70.47
[2.774]
1090
[42.913]
1219.21
[48.000]
571.5
[22.500]
65.16
[2.565]
424
[16.693]
268.18
[10.558]
11.5
[.453]
8
[.315]
14
[.551]
TITLE
INSTALL DWG
RTSW200A3F
ISSUE DATE:
SIZE CAGE NO DWG NO
10000007892
REV
B
N/A
A
SCALE
0.125
WT-KG 40.524 SHEET
1 of 1
GENERAC POWER SYSTEMS OWNS THE COPYRIGHT OF THIS DRAWING
WHICH IS SUPPLIED IN CONFIDENCE AND MUST NOT BE USED FOR
ANY PURPOSE OTHER THAN FOR WHICH IT IS SUPPLIED WITHOUT
THE EXPRESS WRITTEN CONSENT OF GENERAC POWER SYSTEMS.
c GENERAC POWER SYSTEMS 2013
ELECTRONICALLY APPROVED
INSIDE WINDCHILL
DRAWING CREATED FROM PRO/ENGINEER
3D FILE. ECO MODIFICATION TO BE
APPLIED TO SOLID MODEL ONLY.
SH
1/1
REV
A
WINDCHILL VERSION
A.1
SEE DETAIL A
DETAIL A
SCALE 0.500
4 PLACES
Installation Drawing
No. 10000007892
Drawings and Diagrams
Automatic Transfer Switch Owner’s Manual 15
Page 20
Drawings and Diagrams
Interconnection Drawing
No. 10000017951—Sheet 1 of 4 (Liquid-Cooled Engine Generator)
16 Automatic Transfer Switch Owner’s Manual
Page 21
No. 10000017951—Sheet 2 of 4 (Liquid-Cooled Engine Generator)
Drawings and Diagrams
Automatic Transfer Switch Owner’s Manual 17
Page 22
Drawings and Diagrams
No. 10000017951—Sheet 3 of 4 (Air-Cooled Engine Generator)
18 Automatic Transfer Switch Owner’s Manual
Page 23
No. 10000017951—Sheet 4 of 4 (Air-Cooled Engine Generator)
Drawings and Diagrams
Automatic Transfer Switch Owner’s Manual 19
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Drawings and Diagrams
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20 Automatic Transfer Switch Owner’s Manual
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Drawings and Diagrams
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Automatic Transfer Switch Owner’s Manual 21
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Drawings and Diagrams
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22 Automatic Transfer Switch Owner’s Manual
Page 27
Page 28
Part No. 1000017457 Rev A 07/21/17
©2017 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)
www.generac.com
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