Generac Power Systems HTS User manual

Owner’s Manual
For
HTS Automatic Transfer Switch
100 - 2600 Amp, 600 Volts
This manual should remain with the unit.
*NOT INTENDED FOR USE IN CRITICAL
LIFE SUPPORT APPLICATIONS.
*ONLY QUALIFIED ELECTRICIANS OR
CONTRACTORS SHOULD ATTEMPT
INSTALLATION!
MODEL:________________________
SERIAL:________________________
DATE PURCHASED:______________

ii Automatic Transfer Switch Owner’s Manual

Table of Contents
Automatic Transfer Switch Owner’s Manual iii
Section 1 Safety
1.1 Introduction ....................................................1
1.2 Safety Rules ...................................................1
1.3 Safety Symbols and Meanings .....................2
Section 2 General Information
2.1 Equipment Description .................................3
2.1.1 Automatic Transfer Switch .................................3
2.1.2 Transient Voltage Surge Suppression ................3
2.1.2.1 Modes of Protection.............................................. 3
2.1.2.2 Ratings ................................................................. 3
2.1.2.3 Certification........................................................... 3
2.1.2.4 TVSS Disconnect ................................................. 3
2.1.2.5 Status Indicators................................................... 3
2.1.2.6 Remote Alarm Contacts........................................ 4
2.2 Communications ............................................4
2.2.1 G and H Panel Generators .................................4
2.2.2 Non G and H Panel Generators .........................4
2.3 Operation With Loss of Communications ...4
2.4 Transfer Switch Data Label ...........................5
2.5 Transfer Switch Enclosure ...........................5
2.6 Safe Use of Transfer Switch .........................5
Section 3 Installation
3.1 Introduction to Installation ...........................7
3.2 Unpacking ......................................................7
3.3 Mounting .........................................................7
3.4 Connecting Power Source and Load Lines .7
3.4.1 Transfer Mechanisms (100-400A) ......................7
3.4.2 Transfer Mechanisms (600-2600A) ....................8
3.5 Transfer Mechanism ......................................8
3.5.1 100-400A Models ...............................................8
3.5.2 600-2600A Models .............................................8
3.6 Transfer Mechanism Operation ....................8
3.6.1 100-400A Models ...............................................8
3.6.2 600-2600A Models .............................................8
3.7 Main Contacts at Normal (Utility) .................9
3.8 Main Contacts at Neutral ...............................9
3.9 Main Contacts at Standby (Emergency) ...... 9
3.10 Connecting Controller Communication
Wires ..................................................................... 9
3.11 Setting Dip Switches ................................... 9
3.11.1 Dip Switch 1 ...................................................10
3.11.2 Dip Switch 2 ...................................................10
3.11.3 Switches 2 to 6 ...............................................10
3.11.4 Switches 7 and 8 ............................................10
3.11.5 Synchronization Limits ...................................10
3.11.6 Voltage Limits .................................................10
3.12 Programming ............................................. 11
3.13 Auxiliary Contacts ..................................... 11
Section 4 Operation
4.1 Functional Tests and Adjustments ............ 13
4.2 Manual Operation ........................................ 13
4.2.1 100 - 400 Amp Models .....................................14
4.2.1.1 Close to Normal Source Side ............................. 14
4.2.1.2 Close to Standby Source Side............................ 14
4.2.1.3 Return to Normal Source Side............................ 14
4.2.2 600 - 2600 Amp Models ...................................14
4.2.2.1 Trip to Neutral Position ....................................... 14
4.2.2.2 Close to Emergency Source Side....................... 14
4.2.2.3 Close to Normal Source Side ............................. 15
4.3 Voltage Checks ............................................ 15
4.4 Electrical Operation .................................... 16
4.5 Switches and Indicators ............................. 16
4.5.1 System Ready LED ..........................................17
4.5.2 Standby Operating LED ...................................17
4.5.3 Switch Position LEDs .......................................17
4.5.4 Utility Available LED .........................................17
4.5.5 Test Switch and Curtailment Input ...................17
4.5.6 Fast Test Button ...............................................17
4.5.7 Return to Normal Switch ..................................17
4.5.8 Maintenance Disconnect Switch
(Auto/Manual) ...................................................17
4.6 Sequence of Operation ............................... 17
4.6.1 Sequence 1 - Utility Voltage Dropout ...............17
4.6.2 Sequence 2 - Line Interrupt Delay ....................18
4.6.3 Sequence 3 - Engine Minimum Run and Engine
Warmup Timers ...............................................18
Table of Contents

Table of Contents
iv Automatic Transfer Switch Owner’s Manual
4.6.4 Sequence 4 - Signal Before Transfer ............... 18
4.6.5 Sequence 5 - ATS Transfer to Generator
Position ............................................................ 18
4.6.6 Sequence 6 - Utility Voltage Pickup ................. 18
4.6.7 Sequence 7 - Return to Utility Timer ................ 18
4.6.8 Sequence 8 - Signal Before Transfer ............... 18
4.6.9 Sequence 9 - ATS Transfer to Utility Position .. 18
4.6.10 Sequence 10 - Engine Cooldown Timer ........ 18
4.7 Transfer Switch Options .............................18
4.7.1 Signal Before Transfer ..................................... 19
4.7.2 Instrument Package (Utility Monitor) ................ 20
Section 5 Maintenance
5.1 Operate Transfer Switch .............................21
5.2 Clean and Inspect Transfer Switch ............21
5.3 Lubrication ...................................................21
5.4 Main Current Carrying Contacts ................21
5.5 Batteries .......................................................21
Section 6 Installation Drawings
6.1 100-400 Amp LV ...........................................23
6.1.1 No. 0H6400ID-B (Part 1 of 2) .......................... 23
6.1.2 No. 0H6400ID-B (Part 2 of 2) .......................... 24
6.2 100-400 Amp LV ...........................................25
6.2.1 No. 0H6410ID-B (Part 1 of 2) .......................... 25
6.2.2 No. 0H6410ID-B (Part 2 of 2) .......................... 26
6.3 100-400 Amp HV ...........................................27
6.3.1 No. 0H6420ID-B (Part 1 of 2) .......................... 27
6.3.2 No. 0H6420ID-B (Part 2 of 2) .......................... 28
6.4 600-1000 Amp ...............................................29
6.4.1 No. 0H6440ID-C (Part 1 of 2) ......................... 29
6.4.2 No. 0H6440ID-C (Part 2 of 2) ......................... 30
6.5 1200-1600 Amp .............................................31
6.5.1 No. 0H6450ID-C (Part 1 of 2) ......................... 31
6.5.2 No. 0H6450ID-C (Part 2 of 2) ......................... 32
6.6 2000-2600 Amp ............................................33
6.6.1 No. 0H6460ID-C (Part 1 of 2) .......................... 33
6.6.2 No. 0H6460ID-C (Part 1 of 2) ......................... 34

Automatic Transfer Switch Owner’s Manual 1
Section 1 Safety
1.1 — Introduction
Read the following information carefully before attempt-
ing 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.
1.2 — Safety Rules
The manufacturer cannot anticipate every possible cir-
cumstance 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 specifi-
cally 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 unit, DANGER, WARNING, CAUTION and
NOTE blocks are used to alert personnel to special
instructions about a particular operation that may be haz-
ardous if performed incorrectly or carelessly. Observe
them carefully. Their definitions are as follows: NOTE: Notes contain additional information important to a pro-
cedure and will be found within the regular text of this manual.
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.
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Safety
2Automatic Transfer Switch Owner’s Manual
1.3 — Safety Symbols and Meanings
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Automatic Transfer Switch Owner’s Manual 3
Section 2 General Information
2.1 — Equipment Description
2.1.1— Automatic Transfer Switch
The commercial transfer switch range (HTS) is designed
to operate in conjunction with the Power Manager Gxxx
and Hxxx series of Generator controllers. The transfer
switch has a simple 2-wire communications link to the
Generator controller and can thus be mounted remote
from the Generator.
Utility voltage is monitored by the HTS and fed back to
the engine generator control panel for comparison
against setpoints, used to determine if the Utility voltage
is “good.”
Operation of the switch is instigated by the generator
control panel, however, all aspects of TDN timing or
inphase transfer are handled locally at the HTS. The HTS
monitors a single phase of the Generator voltage in order
to perform inphase transfers.
All timers and voltage setpoints are programmable in the
G/H control panel. Some of the decisions are made by
the HTS itself so the appropriate parameters are passed
to the HTS via the communication link. If the communica-
tion link were to break, the HTS will still function. It will
monitor the Utility and Generator voltages and make the
transfer determination itself, rather than being com-
manded by the generator control panel. It will either use
the last parameters sent, or, if no parameters were ever
sent (communications were never established), it will
take its settings from onboard DIP Switches and a set of
resident parameters.
The automatic transfer switch is used for transferring crit-
ical electrical load from a normal (utility) power source to
a standby (emergency) power source. Such a transfer of
electrical loads occurs automatically when the normal
power source has failed or is substantially reduced and
the standby source voltage and
frequency have reached an acceptable level. The trans-
fer switch prevents electrical feedback between two dif-
ferent power sources (such as the normal and standby
sources) and, for that reason, codes require it in all
standby electric system installations.
2.1.2— Transient Voltage Surge Suppression
The Transient Voltage Surge Suppression (TVSS) is pro-
vided to protect the load from electrical surges and/or
transient voltage spikes. This device is physically located
on the side wall of the enclosure. It is electrically con-
nected to the load side of the transfer switch. A 30 amp
circuit breaker is provided to disconnect the TVSS from
the transfer switch for maintenance or replacement.
The TVSS is made up of multiple solid state Metal Oxide
Varistors (MOV) connected in parallel for each mode of
protection. These devices are equipped with integrated
short circuit and individual component level fusing. They
are self-reseting and fully automatic.
2.1.2.1—Modes of Protection
The TVSS provides protection on all modes:
•Single Phase (6): L-L, L-N, L-N, L-G, L-G and NG.
•Three Phase (10): L-L, L-L, L-L, L-N, L-N, L-N,
L-G, L-G, L-G and N-G.
2.1.2.2—Ratings
•Surge Capacity: 200 kA maximum.
2.1.2.3—Certification
The TVSS is UL recognized to the requirements of UL
1449 3rd edition.
2.1.2.4—TVSS Disconnect
Each TVSS is provided with a disconnect. The discon-
nect is a 30 amp circuit breaker, 2-pole for single phase,
and 3-pole for three phase. This is to allow replacement
of the TVSS module without interruption of the electrical
supply to the load.
IMPORTANT: Turn on TVSS disconnect circuit breaker
when the procedure is complete. If circuit breaker is not
turned on, the TVSS module will not provide surge protec-
tion for customer load.
2.1.2.5—Status Indicators
Each TVSS module has comprehensive, solid state, con-
tinual visual status monitoring of each protection mode
present. There are two LEDs provided, located on the
cover of the module. The green LED (left side) is used to
indicate that the TVSS module is energized and in work-
ing order. The red LED (right side) will turn on in the
event the suppressor capability is exceeded or if there is
an internal safety component activating. When both the
green and red LEDs are on, there is a neutral to ground
fault.
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General Information
4Automatic Transfer Switch Owner’s Manual
When the power is first applied, the unit does a brief
internal diagnostic test. During this test, the red LED will
illuminate briefly, go off and then the green LED will illu-
minate.
For the power source to be available, the associated ser-
vice disconnect circuit breaker must be ON, the associ-
ated TVSS disconnect circuit breaker must be ON and
the associated source must be present.
The LED status indicators can be viewed directly on the
TVSS module with the enclosure door open.
2.1.2.6—Remote Alarm Contacts
Each TVSS module is equipped with a set of alarm con-
tacts to indicate the TVSS module protection status, to a
external alarm. This is available as a full set of dry relay
contacts (C, NO, NC). The contact ratings are: 3A,
120Vac maximum. The contacts are wired to a three
position terminal strip for customer connection.
If the contacts change state, it indicates either a power
failure to the TVSS module or a failure of the TVSS mod-
ule.
2.2 — Communications
2.2.1— G and H Panel Generators
The HTS acts as a Modbus slave on the communications
network. For the “H” series of generator controllers, Port
1 is used for the connection. On the “G” series of control-
lers, Port 0 is used. The base Modbus address for the
transfer switch is set at 240 but can be modified using dip
switches DIP1 - switches 7 and 8. Unless there are two
transfer switches on the network, these switches can be
left OFF.
Communications parameters on the Power Manager
should be set to:
•Modbus Master Port
•4800 Baud
•No parity, 2 stop bits
The Network uses Modbus RTU protocol. Communica-
tions are sent at a one second rate. If no Good messages
are received within 20 seconds, the communications link
is determined to be bad and the switch controller will
revert to local control. If the link re-establishes itself the
remote control from the H-panel restarts. See Figure 2-1.
Figure 2-1. Typical Communication Network
2.2.2— Non G and H Panel Generators
This switch is provided with a “2-wire start” output. The 2-
wire start output is for use with non-G and H control panel
generators. The 2-wire start connection is made on the 6
position terminal strip labeled Engine Generator Connec-
tions, wire numbers 178 and 183. This connection is best
used as a back up to the normal RS-485 communication
link.
The 2-wire start output allows the ATS to start and stop
the generator automatically. Without a RS-485 communi-
cation link and 2-wire start, the timing functions of the
transfer switch will be the last settings downloaded from
the G or H panel or if all power is removed from the ATS,
the controller will revert to the default settings.
2.3 — Operation With Loss of Com-
munications
Local control means that if the generator is running, the
generator can be running in Manual or Auto. If there is no
utility, the switch will transfer to the generator. If utility
returns, the switch will transfer back to utility. If only the
RS-485 communication lines are connected, the genera-
tor will not start or stop automatically as it cannot commu-
nicate with the switch to know the utility is missing. It will
have to be manually started and stopped (with the key-
switch set in the manual position). If the RS-485 commu-
nication link is not functioning and the 2-wire start lines
are connected between the HTS and the generator, the
generator will start and stop automatically via the 2-wire
start lines.
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General Information
Automatic Transfer Switch Owner’s Manual 5
2.4 — 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.
2.5 — Transfer Switch Enclosure
The standard switch enclosure is a National Electrical
Manufacturer’s Association (NEMA) 12 type. NEMA 12
type enclosures primarily provide protection against con-
tact with the enclosed equipment and provide a degree of
protection against dust, falling dirt, and dripping non-cor-
rosive liquids. NEMA 12 type enclosures are for indoor
use only.
2.6 — Safe Use of Transfer Switch
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 equip-
ment.
Publications that outline the safe use of transfer switches
are the following:
•NFPA 70; National Electrical Code
•NFPA 70E; Standard for Electrical Safety in the
Workplace
•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.

General Information
6Automatic Transfer Switch Owner’s Manual
This page intentionally left blank.

Automatic Transfer Switch Owner’s Manual 7
Section 3 Installation
3.1 — Introduction to Installation
Though this equipment has been wired and tested at the
factory, the installer should verify all wiring connections
are proper. Installing the switch includes the following
procedures:
•Mounting the enclosure.
•Connecting power source and load leads.
•Connecting the generator communication circuit.
•Setting DIP switches on ATS controller.
•Programming Gxxx or Hxxx control on engine gen-
erator.
•Installing/connecting any options and accessories.
•Testing functions.
3.2 — Unpacking
Carefully unpack transfer switch. Inspect closely for any
damage. Purchaser must file damage claim with carrier
for noted shipping damage.
Verify all packing material is removed from switch before
installation.
Attach any lifting device to the transfer switch mounting
holes or brackets. do not lift the switch at any other point.
3.3 — Mounting
Mounting dimensions for the transfer switch enclosure
are in this manual. Enclosures are typically floor standing
and mounted to the wall. Components are generally
mounted in a standard NEMA 12-type enclosure. A
NEMA 3R, is also available. See “Transfer Switch
Options” on page 18.
Install the transfer switch as close as possible to the elec-
trical loads that are to be connected to it. Stand the enclo-
sure on a flat surface. If the surface is not flat, it will be
necessary to add shims to make the enclosure level.
Mount to a wall or support structure for vertical stability.
To prevent switch distortion, level all mounting points. If
necessary, use washers behind mounting holes to level
the unit.
3.4 — Connecting Power Source and
Load Lines
Wiring diagrams and electrical schematics are provided
in this manual. Power source and load connections are
made at a transfer mechanism, inside the switch enclo-
sure.
3.4.1— Transfer Mechanisms (100-400A)
See Figure 3-1. This switch is used with a single-phase
system, when the single-phase neutral line is to be
switched during transfer; or with a three-phase system,
when neutral is not to be switched.
All power cables should enter the switch next to the
transfer mechanism terminals. Standard terminal lugs on
the transfer mechanism are solderless, screwtype.
Connect power source and load conductors to clearly
marked terminal lugs on transfer mechanism as follows:
•load leads: Connect to terminals T1, T2, & T3.
•normal (utility) Source Leads: To terminals N1, N2,
& N3.
•standby (emergency) Source Leads: Connect to
transfer mechanism terminal lugs E1, E2, & E3.
Figure 3-1. Typical 3-Pole Transfer
Mechanism (200 Amp Shown)
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Installation
8Automatic Transfer Switch Owner’s Manual
3.4.2— Transfer Mechanisms (600-2600A)
See Figure 3-2. The transfer mechanism may be either a
2-pole, 3-pole, or 4-pole type. The switch enclosure may
include a neutral block for connection of the neutral line.
Figure 3-2. Transfer Mechanism
Before connecting wiring cables to terminals, remove any
surface oxides from the cable ends with wire brush. If
aluminum conductors are used, apply joint compound.
Tighten terminal lugs to the torque values in the following
chart.
All power cables should enter the switch next to transfer
mechanism terminals. Standard terminal lugs on the
transfer mechanism are solderless, screw-type.
Be sure to maintain proper electrical clearance between
live metal parts and grounded metal. Allow at least one
inch for circuits over 400 amps.
3.5 — Transfer Mechanism
The transfer mechanism houses the main, current carry-
ing contacts, along with other mechanical and electrical
components, required for operating the switch. The main
contacts are electrically operated and mechanically
latched in place. See Figure 3-1.
Power for the operating coils is taken from the source of
supply that the Customer Load is being transferred to.
Therefore, transfer to any power source cannot occur
unless that power source is available to the switch.
3.5.1— 100-400A Models
Main contacts are actuated by a single solenoid, are
electrically operated and mechanically held. load or “T”
contacts, bolted to an insulated plastic pole piece are sta-
tionary. The normal (utility) and standby (emergency)
contacts are moveable. The contacts are actuated by
means of a closing coil and mechanical linkage. The pole
assemblies which retain the stationary moveable main
contacts are assembled together and retained by through
bolts.
3.5.2— 600-2600A Models
600-2600A models are bolted to an insulated plastic pole
piece and are stationary. The utility (normal) and genera-
tor (emergency) contacts are moveable.
3.6 — Transfer Mechanism Operation
3.6.1— 100-400A Models
There is a single solenoid coil in the "W" switch that is
used to transfer the power to the respective load. The
solenoid coil is energized to move the mechanism to the
neutral position (both sources of supply disconnected). If
the solenoid coil is kept energized the switch mechanism
will remain in the neutral position. When the solenoid coil
is de-energized the mechanism will close the contacts in
the opposite position. This process is repeated to move
the mechanism back to the original position.
3.6.2— 600-2600A Models
There are three (3) coils inside a “WN” switch that are
used in transferring power to the respective load;
•Closing Coil - When energized, closes the main
contacts on Utility or Generator side, depending on
if the select coil is energized or not.
•Select Coil - When energized, the mechanism is
configured to close the Generator supply contacts
when the closing coil is energized.
•Trip Coil - When energized, the main contact latch
is released and the contacts move to the open
position by spring tension.
All 3 solenoids are only energized momentarily.
Refer to the diagnostic repair manual 079247, section 9.6
for complete operational analysis.
Switch Rating Wire Size Torque
600 AMP 500MCM-1/0 375 in-lbs
800/1000 AMP 500MCM-1/0 375 in-lbs
1200/2600 AMP 750MCM-1/0 500 in-lbs
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Installation
Automatic Transfer Switch Owner’s Manual 9
3.7 — Main Contacts at Normal (Util-
ity)
The illustration shows the load terminals connected to
the normal (utility) terminals. Window “A” will display the
word “ON,” Window “B” the word “OFF.” See Figure 3-3.
Figure 3-3. Main Contact at Normal (Utility)
3.8 — Main Contacts at Neutral
Load terminals are disconnected from both power supply
terminals. The word “OFF” will be displayed in both Win-
dows “A” and “B.” See Figure 3-4.
Figure 3-4. Main Contacts at Neutral
3.9 — Main Contacts at Standby
(Emergency)
Load terminals are connected to the standby (emer-
gency) power supply. Window “B” will display the word
“ON,” Window “A” the word “OFF.” See Figure 3-5.
Figure 3-5. Main Contacts at Standby
(Emergency)
3.10 — Connecting Controller Com-
munication Wires
Use shielded 2-wire communications cable (such as
Belden #9460) to make the communications line connec-
tion from the HTS transfer switch to the engine generator
connection panel. This cable is to be routed in a separate
conduit between the HTS transfer switch and the engine
generator. The cable is to be connected as follows:
•HTS transfer switch - 6-position terminal block, in
the bottom of the transfer switch enclosure (labeled
“comm. Ports”).
•Engine generator - terminal strip in customer con-
nection panel. Do not connect the shield at this
end.
3.11 — Setting Dip Switches
The dip switches, in the HTS, are read once, only at
power up. If the communications to the Power Manager
or the engine controller are working, it will overwrite the
dip switch settings. In this way there are no conflicts and
also the transfer switch will use the latest settings even if
the communications fail.
A Utility Position “ON”
B Emergency Position “OFF”
CLoad
A Utility Position “ON”
B Emergency Position “OFF”
CLoad
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B
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B
A Utility Position “ON”
B Emergency Position “OFF”
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Installation
10 Automatic Transfer Switch Owner’s Manual
3.11.1— Dip Switch 1
All voltages listed, are Line - Line and all three phases
are checked.
All voltages are expressed as line - line, but checked as
line - neutral, line - neutral and line - line.
As of the V1.8 software release, there will only be one
PCB for all voltage codes.
•TDN/INPHASE - Dip1- switch 4: Set this switch to
ON to select TDN type transfers.
•CTTS/OTTS - Dip1 - switch 5: Set this switch to
OFF for a OTTS type transfer switch.
•THREE PHASE - Dip1 - switch 6: Set this switch to
ON for 3 phase wiring. Set this switch to OFF for
single-phase wiring.
•MODBUS ADDRESS - Dip1- switches 7,8: The
base Modbus address for the transfer switch is set
at 240. The transfer switch will NOT respond to the
universal address 250. By changing the address
dip switches, the full range of available addresses
for transfer switches is:
3.11.2— Dip Switch 2
•60/50 Hz - Dip2 - switch 1: Set this switch to ON for
a 60Hz system. This setting is only used if the com-
munications fail. Normally it will be overridden by
the target frequency setting in the G/H panel. The
Generator and Utility must be within 1Hz of this
nominal frequency for an inphase transfer to take
place.
3.11.3— Switches 2 to 6
These switches no longer have any function.
3.11.4— Switches 7 and 8
These switches select the communications baud rate,
they are for future development and should currently both
be set to off (4800 baud).
3.11.5— Synchronization Limits
Synch requirements are:
•Generator frequency within 1Hz of nominal
•Voltage within User Programmed limits
•Absolute Voltage difference within +/- 6V
•Generator/Utility Frequency difference within
+ 0.2/- 0.0 Hz
•Phase difference within - 7 / +0 degrees
(i.e. Generator voltage is earlier than Utility and catching
up, this gives some compensation for the transfer switch
closing delay).
Voltage Codes
THREE PHASE DIP SWITCH SELECTED
Code Dip1_3 2 1
0 = 480 Vac 0 0 0
1 = 600 Vac 0 0 1
2 = 415 Vac 0 1 0
3 = 240 Vac 0 1 1
4 = 220 Vac 1 0 0
5 = 208 Vac 1 0 1
6 = 480 Vac (spare) 1 1 0
7 = 480 Vac (spare) 1 1 1
SINGLE PHASE DIP SWITCH SELECTED
Code Dip1 – 3 2 1
0 = xxx Vac 0 0 0
1 = xxx Vac 0 0 1
2 = xxx Vac 0 1 0
3 = 240 Vac 0 1 1
4 = 220 Vac
(typically 50Hz)
1 0 0
5 = xxx Vac 1 0 1
6 = xxx Vac 1 1 0
7 = xxx Vac 1 1 1
Modbus Address Dip1 – 8 7 GenLink DCP
Switch Number
240 0 0 1
241 0 1 2
242 1 0 3
243 1 1 4
Baud Rate Dip 8 7
4800 0 0
9600 0 1
38400 1 0 (V1.8)
57600 1 1 (V1.8)

Installation
Automatic Transfer Switch Owner’s Manual 11
3.11.6— Voltage Limits
Determination of proper Utility is performed by the H or G
controller against user programmable limits. If the com-
munication link to the transfer switch breaks down, the
following criteria are used for a local determination.
Dropout — any phase outside - 70 to +130% of nomi-
nal (not the average voltage)
Pickup — all phases > +75% of nominal
3.12 — Programming
The HTS transfer switch is controlled by the G/H control
panel on the engine generator. The timer, voltage pickup,
dropout and exercise settings are programmed into the
G/H control panel. Please refer to the G/H control panel
manual for details on programming the HTS transfer
switch controls.
3.13 — Auxiliary Contacts
It is possible to add Auxiliary Contacts on the transfer
switch to operate customer accessories, remote advisory
lights, or remote annunciator devices. It is necessary to
change the single pole limit switch to a double pole
device. Reconnect 0A, 147 and 148 to like terminals on
the double limit switch. A suitable power source must be
connected to the common (C) terminal.
Contact operation is shown in the following chart:
NOTE: Auxiliary Contacts are rated 10 amps at 125 or 250 volts
AC. do not exceed the rated voltage and current of the contacts.
Figure 3-6. 100-200 amp Switches
Figure 3-7. 300-2600 amp Switches
Figure 3-8. Single Auxiliary Contacts
Figure 3-9. Double Auxiliary Contacts
Switch Position
Utility Standby
Common to Normally Open Closed Open
Common to Normally Closed Open Closed
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A
B
Figure 3.6 – 3.7
A Auxiliary Contact (Actuated)
B Auxiliary Contact (Non-Actuated)
Both side views shown in UTILITY position.
Figure 3.8 – 3.9
ACommon
B Normally Open
C Normally Closed
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Installation
12 Automatic Transfer Switch Owner’s Manual
This page intentionally left blank.

Automatic Transfer Switch Owner’s Manual 13
Section 4 Operation
4.1 — Functional Tests and Adjust-
ments
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, stan-
dards, and regulations. When absolutely certain the
installation is proper and correct, complete a functional
test of the system. Perform functional tests in the exact
order presented in this manual, or damage to the switch
could result.
IMPORTANT: Before proceeding with functional tests, ver-
ify the instructions and information in this section is under-
stood. 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 opera-
tion. Confirm that there is no debris present in and/or
around the switch mechanism from the installation.
4.2 — Manual Operation
A manual switch handle is shipped with the transfer
switch. Manual operation must be checked before the
transfer switch is operated electrically. To check manual
operation, proceed as follows:
1. In the transfer switch enclosure, set the Mainte-
nance Disconnect switch to manual. This prevents
the generator from starting automatically as soon
as the utility power source is turned OFF.
2. If so equipped, turn the generator’s AUTO/OFF/
MANUAL switch to OFF.
3. Turn OFF both normal and standby power supplies
to the transfer switch, with whatever means pro-
vided, such as the main line circuit breaker(s).
4. Note position of transfer mechanism main contacts
by observing display windows in “A” and “B” in Fig-
ure 4-1 as follows:
•Window (A) ON, Window “B” OFF - load terminals
(T1, T2, T3) are connected to normal terminals
(N1, N2, N3).
•Window (A) OFF, Window “B” ON - load terminals
(T1, T2, T3) are connected to standby terminals
(E1, E2, E3).
Figure 4-1. Main Contacts
5. See Figure 4-2. Attach handle (A) to actuating
shaft (B).
Figure 4-2. Attach Handle to Actuating Shaft
6. Move handle down, then release slowly to allow
internal spring to relax.
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Operation
14 Automatic Transfer Switch Owner’s Manual
Figure 4-3. Move Handle Down
4.2.1— 100 - 400 Amp Models
4.2.1.1—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”, proceed with Step 1, and if it reads “OFF,” proceed
with Step 2.
1. With the handle attached to the actuating shaft,
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. “OFF” now appears in Window “A” and
“ON” appears in Window “B”. Proceed with Step 2.
2. With the handle attached to the actuating shaft,
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”. Proceed with Sub-
section 4.2.1.2— Close to Standby Source Side.
4.2.1.2—Close to Standby Source Side
Before proceeding, ensure completion of Step 2 under
Subsection 4.2.1.1— Close to Normal Source Side. See
Figure 4-1. This will ensure that Window “B” on the
switch reads “OFF.” With the handle attached to the actu-
ating shaft, 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”.
4.2.1.3—Return to Normal Source Side
Manually actuate switch to return Window “A” to the “ON”
position.
4.2.2— 600 - 2600 Amp Models
4.2.2.1—Trip to Neutral Position
1. See Figure 4-4. Remove manual handle from
square shaft at the upper left corner of the switch.
2. Insert a screwdriver into the “Trip” hole and push
in.
3. The main contact should trip to the neutral position
and the word “OFF” should appear in both windows
“A” and “B”.
Figure 4-4. Trip to Neutral
4.2.2.2—Close to Emergency Source Side
Before proceeding, verify the position of the switch by
observing window “A” and window “B”. If window “B” dis-
plays ON, the ATS is closed in the standby position, with
the load connected to the standby source. It is not neces-
sary to manually close in the standby position. See Fig-
ure 4-5.
If window “B” reads OFF and window “A” reads ON it will
be necessary to trip the ATS to the neutral position. See
the Trip to Neutral Position section.
With handle attached to the actuating shaft. Insert screw-
driver into hole marked “Select”. While pushing inward on
screwdriver, move manual handle upward as indicated by
arrow in illustration until it stops. do not force. Confirm
main contacts close to standby source when window “B”
is ON and window “A” is OFF. Remove handle from
switch.
1. See Figure 4-5. Attach manual handle to shaft “M.”
2. Insert screwdriver into the “Select” hole and push
in.
3. While pushing screwdriver in, actuate handle in
direction indicated by arrow.
4. Confirm closure to emergency source by the word
“OFF” in Window “A,” “ON” in Window “B.”
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3
2
1

Operation
Automatic Transfer Switch Owner’s Manual 15
Figure 4-5. Closure to Emergency
Source Side
4.2.2.3—Close to Normal Source Side
Before proceeding, verify the position of the switch by
observing window “A” and window “B”. If window “A”
reads ON the ATS is closed in the utility position, with the
load connected to the normal source. It is not necessary
to manually close in the utility position. See Figure 4-6.
If window “A” reads OFF and window “B” reads ON it will
be necessary to trip the ATS to the neutral position. See
the Trip to Neutral Position section.
With handle attached to the actuating shaft. Move man-
ual handle upward as indicated by arrow in illustration
until it stops. do not force. Confirm main contacts close to
utility source when window “A” is ON and window “B” is
OFF. Remove handle from switch.
1. See Figure 4-6. Attach manual handle to shaft “M.”
2. Actuate handle in direction indicated until it stops.
3. Confirm closure to normal source by “ON” in Win-
dow “A,” “OFF” in Window “B.”
4. Detach the manual handle.
Figure 4-6. Closure to Normal Source Side
4.3 — Voltage Checks
IMPORTANT: Any voltage measurements should be per-
formed with a meter that meets UL3111 safety standards,
and meets or exceeds overvoltage class CAT III.
Before performing voltage checks, verify the following:
1. Disconnect all loads from transfer switch until all
voltage checks and phase rotation checks have
been completed.
2. Set the Maintenance Disconnect switch (inside
transfer switch enclosure) to MANUAL.
3. Check the transfer switch data label for rated volt-
age. Verify voltage is compatible with normal and
standby power source voltages.
Perform voltage checks as follows:
1. Inside the transfer switch enclosure, set the Main-
tenance Disconnect switch to MANUAL.
2. If generator is so equipped, set the AUTO/OFF/
MANUAL switch to OFF.
3. Check that the word “ON” is visible in Window “A,”
the word “OFF” in Window “B.” See “Manual Oper-
ation” on page 13 for location of “A” and “B” win-
dows.
IMPORTANT: Before proceeding, manually connect the
load to normal power supply. Window “A” must indicate
“ON,” Window “B” must indicate “OFF” before proceeding.
4. Locate the battery disconnect connector on the
outside of the transfer switch controller. Plug the
two connectors together.
NOTE: If both utility and generator sources are unavailable for
more than 24 hours, disconnect battery by unplugging battery
disconnect leads.
5. Turn ON the normal (utility) power supply to the
transfer switch, with whatever means provided
(such as the main line circuit breaker).
6. With utility voltage available to the transfer switch,
check that the switch - position utility LED on the
enclosure door is ON. If the switch - position utility
LED is OFF, turn off the utility power supply to the
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Operation
16 Automatic Transfer Switch Owner’s Manual
transfer switch by whatever means provided (such
as the main line circuit breaker), then return to Step
1 of Subsection 4.3 — Voltage Checks.
7. On the enclosure door, check that the utility avail-
able LED is ON.
8. With an accurate AC voltmeter, check the phase-
to- phase (line-to-line) and phase-to-neutral (line-
to- neutral) voltages present at transfer mechanism
terminals N1, N2, and N3, and neutral. supplied
voltages must be fully compatible with transfer
switch rated voltage.
IMPORTANT: Verify the phase rotation of normal (utility)
power lines and transfer switch load power lines are com-
patible.
9. Refer to the standby generator instruction manual.
Make sure the generator engine has been properly
serviced and prepared for use, as outlined in that
manual. Then start the generator engine manually.
Let the engine stabilize and warm up for a few min-
utes.
10. Turn ON the standby (emergency) power supply to
the transfer switch by whatever means provided
(such as the main line circuit breaker).
11. With the generator running, check that the standby
- operating LED on the switch enclosure door is
ON.
12. With an accurate AC voltmeter, check phase-to
phase (line-to-line) and phase-to neutral (line-to
neutral) voltages present at transfer mechanism
terminals E1, E2 and E3. Also check AC frequency
at those terminals. Generator AC output voltage
and frequency must be compatible with transfer
switch rated voltage and frequency.
IMPORTANT: Verify the phase rotation of standby (genera-
tor) power lines and transfer switch normal (utility) and
load power lines are compatible.
13. If supplied voltage or frequency is incorrect, refer to
standby generator Owner’s Manual. If AC fre-
quency is incorrect, adjust engine governed speed.
If voltage is incorrect, adjust generator’s voltage
regulator or correct the problem.
14. When supplied voltage and frequency is correct,
shut down the engine manually.
IMPORTANT: Supplied voltages from both normal (utility)
and standby (emergency) power sources must be compati-
ble with transfer switch rated voltage before proceeding.
15. Connect the transfer switch load to the transfer
switch after completion of Subsection 4.3 — Volt-
age Checks. Connect the load to the transfer
switch by whatever means provided, such as cir-
cuit breaker(s), then proceed to Subsection 4.4 —
Electrical Operation.
4.4 — Electrical Operation
Test transfer system electrical operation as follows:
1. On the enclosure door, check that the utility avail-
able led is ON.
2. On the enclosure door, check that the switch posi-
tion-utility LED is ON.
IMPORTANT: The utility available LED and the switch posi-
tion-utility LED (on enclosure door) must both be ON
before proceeding to Step 3.
3. Refer to the appropriate owner’s manual. Be sure
the standby generator is prepared for automatic
operation.
4. In the switch enclosure, set the Maintenance Dis-
connect switch to AUTOMATIC.
5. Press the “TEST” button on the enclosure door.
Generator startup and transfer to the standby
power source should occur. Refer to the
“Sequence of Operation” section.
6. Press the “TEST” button again to initiate the
retransfer sequence. The customer load will be
transferred back to the utility power source, using
the preset times. The generator will shut down
once the engine cool down timer has expired.
4.5 — Switches and Indicators
This section will familiarize the reader with switches and
indicators on the membrane switch panel mounted on the
enclosure door, as well as the Maintenance Disconnect
switch inside the switch enclosure. See Figure 4-7.
Figure 4-7. OTTS Switch
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