RTS KGATX0101400 User Manual
RTS Automatic Transfer Switch
400A, 120/240V, Single-phase
Model No.: KGATX0101400
TECHNICAL
MANUAL
A new standard of reliability
This manual should remain with the unit.
Important Safety Instructions
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.
DANGER! Connection of a generator to an electrical system normally supplied by an electric
utility shall be by means of suitable transfer equipment so as to isolate the electric system
from utility distribution system when the generator is operating (Article 701 Legally Required
Standby Systems or Article 702 Optional Standby Systems, as applicable). Failure to isolate
electric system by these means may result in damage to generator and may result in injury
or death to utility workers due to backfeed of electrical energy.
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
the manufacturer does not specifically recommend,
ensure that it is safe for others. Also make sure the
procedure, work method or operating technique utilized 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 instruction about a particular operation
that may be hazardous if performed incorrectly or
carelessly. Observe them carefully. The definitions
are as follows:
DANGER
After this heading, read instructions that, if not
strictly complied with, will result in personal injury
or property damage.
After this heading, read instructions that, if not
strictly complied with, may result in personal injury or property damage.
After this heading, read instructions that, if not
strictly complied with, could result in damage to
equipment and/or property.
NOTE:
After this heading, read explanatory statements
that require special emphasis.
These safety warnings cannot eliminate the hazards
that they indicate. Common sense and strict compliance with the special instructions while performing
the service are essential to preventing accidents.
Four commonly used safety symbols accompany the
DANGER, WARNING and CAUTION blocks. The type
of information each indicates follows:
This symbol points out important safety infor-
mation that, if not followed, could endanger
personal safety and/or property of others.
This symbol points out potential explosion
hazard.
This symbol points out potential fire hazard.
This symbol points out potential electrical shock
hazard.
GENERAL HAZARDS
• Any AC generator that is used for backup power if
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 and dangerous power voltages are
present inside an installed transfer switch. Any
contact with high voltage terminals, contacts or
wires will result in extremely hazardous, and possibly LETHAL, electric shock. DO NOT WORK ON
THE TRANSFER SWITCH UNTIL ALL POWER
VOLTAGE SUPPLIES TO THE SWITCH HAVE
BEEN POSITIVELY TURNED OFF.
• 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 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.
Table of Contents
• Because jewelry conducts electricity, wearing it
may cause dangerous electrical shock. Remove
all jewelry (such as rings, watches, bracelets, etc.)
before working on this equipment.
• If work must be done 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.
• 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 rope or board, to free
the victim from the live conductor. If the victim
is unconscious, apply first aid and get immediate
medical help.
• 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. Turn the generator’s AUTO/OFF/MANUAL switch to OFF. Turn the
generator’s main circuit breaker OFF. Then place
a “DO NOT OPERATE” tag on the transfer switch
and on the generator. Remove the Negative (Neg) or
(–) battery cable.
Safety Rules .........................................Inside Front Cover
Section 1 — General Information ...................................2
1.1 Introduction............................................................. 2
1.2 Equipment Description ........................................... 2
1.3 Transfer Switch Data Label ..................................... 2
1.4 Transfer Switch Enclosure ...................................... 2
1.5 Safe Use of Transfer Switch .................................... 2
Section 2 — Installation ....................................................3
2.1 Introduction to Installation ...................................... 3
2.2 Unpacking ............................................................... 3
2.3 Mounting ................................................................. 3
2.4 Connecting Power Source and Load Lines ............... 3
2.4.1 2-Pole Mechanism ......................................... 3
2.5 Connecting Start Circuit Wires ................................ 4
2.6 Auxiliary Contacts.................................................... 4
Section 3 — Operation .......................................................4
3.1 Functional Tests & Adjustments .............................. 4
3.2 Manual Operation .................................................... 5
3.2.1 Close to Normal Source Side ........................ 5
3.2.2 Close to Emergency Source Side ................... 6
3.2.3 Return to Normal Source Side ...................... 6
3.3 Voltage Checks ......................................................... 6
3.3.1 Utility Voltage Checks .................................... 6
3.3.2 Generator Voltage Checks.............................. 6
3.4 Generator Tests Under Load ................................... 7
Section 4 – Installation Diagram ....................................8
Section 5 – Electrical Data ...............................................9
Section 6 – Exploded Views & Parts Lists ..................12
Section 7 – Warranty ...................................... Back Cover
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Section 1 — General Information
RTS “W” Type Transfer Switch
1.1 INTRODUCTION
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 the 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.
Every effort has been expended to make sure that the
contents of this manual are both accurate and current. The manufacturer reserves the right to change,
alter or otherwise improve the product at any time
without prior notice.
1.2 EQUIPMENT DESCRIPTION
The automatic transfer switch is used for transferring
critical electrical loads from a UTILITY (NORMAL)
power source to an EMERGENCY (GNERATOR)
power source.
The transfer switch prevents electrical feedback
between the UTILITY and EMERGENCY sources. For
that reason, electrical codes require a transfer switch
in all standby electric system installations.
When the transfer switch is connected to the engine
generator control panel, the control panel constantly
monitors the UTILITY voltage and controls the operation of the transfer switch.
Should the UTILITY voltage drop below a preset value,
and remain at this low voltage for a preset amount of
time, the generator cranks and starts. After the generator starts, the transfer switch transfers the load
circuits to the generator, the generator then supplies
the loads. When UTILITY returns above a preset level
the load is transferred back to the UTILITY and the
generator shuts down.
1.3 TRANSFER SWITCH DATA LABEL
A DATA LABEL is permanently affixed to the transfer
switch enclosure. Use this transfer switch only with
the specific limits shown on the DATA LABEL 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 LABEL.
Record the Model and Serial numbers in the space
provided below for future reference.
MODEL #
SERIAL #
1.4 TRANSFER SWITCH ENCLOSURE
The standard switch enclosure is a National Electrical
Manufacturer’s Association (NEMA) and UL 3R type.
UL and NEMA 3R type enclosures primarily provide
a degree of protection against falling rain and sleet;
undamaged by the formation of ice on the enclosure.
1.5 SAFE USE OF TRANSFER SWITCH
Before installing, operating or servicing this equipment, read the SAFETY RULES (inside front cover)
carefully. Comply strictly with all SAFETY RULES
to prevent accidents and/or damage to the equipment. The manufacturer recommends a copy of the
SAFETY RULES are made and 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.
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2.1 INTRODUCTION TO INSTALLATION
This equipment has been wired and tested at the
factory. Installing the switch includes the following
procedures:
• Mounting the enclosure.
• Connecting utility and generator power source
leads.
• Connecting the load leads.
• Connecting any auxiliary contact (if needed)
• Installing/connecting any options and accessories.
• Testing functions.
2.2 UNPACKING
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.
Check that all packing material is completely removed
from the switch prior to installation.
Section 2 — Installation
RTS “W” Type Transfer Switch
2.4.1 2-POLE 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.
Figure 2.1 — Typical 2-Pole Transfer Mechanism
(400 Amp Shown)
2.3 MOUNTING
Mounting dimensions for the transfer switch enclosure are in this manual. Enclosures are typically wallmounted. See the “Mounting Dimensions” drawing.
Handle transfer switches carefully when install-
ing. Do not drop the switch. Protect the switch
against impact at all times, and against construction grit and metal chips. Never install a transfer
switch that has been damaged.
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.
2.4 CONNECTING POWER SOURCE
AND LOAD LINES
DANGER
Make sure to turn OFF both the UTILITY
(Normal) and EMERGENCY (Standby generator)
power supplies before trying to connect power
source and load lines to the transfer switch.
Supply voltages are extremely high and dangerous. Contact with such high voltage power supply lines causes extremely hazardous, possibly
lethal, electrical shock.
Wiring diagrams and electrical schematics are provided in this manual. Power source and load connections are made at the transfer mechanism, inside the
switch enclosure.
Solderless, screw-type terminal lugs are standard.
The conductor size range is as follows:
Switch Rating Wire Range
400A (1) #4-600 MCM or
(2) 1/0-250 MCM
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.
Before connecting wiring cables to terminals, remove
any surface oxides from the cable ends with a wire
brush. All power cables should enter the switch next
to transfer mechanism terminals. If ALUMINUM conductors are used, apply corrosion inhibitor to conductors. 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.
All power cables should enter the switch next to the
transfer mechanism terminals.
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