O & M Manual for ATC-300+ 40-400A (480/600Vac)
ATC-300+ 3-Position Contactor Based Transfer Switch
Instruction Booklet
Description Page
Introduction . . . . . . . . . .
Receiving, Handling, and Storage
Equipment Description . . .
Installation and Wiring . . .
Operation . . . . . . . . . . . .
Testing and Problem Solving
Adjustments
Maintenance . . . . . . . . . .
Renewal Parts Guide
ATC-300+ Contactor Based ATS Quick Start Instructions . .26
Appendix A: Pickup / Dropout Tables . . . . . . . . . .
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IB01602078E For more information visit: www.generac.com
Instruction Booklet
Cat No: ATC3C3X30400WRU
Style No:
ASSEMBLED IN MEXICO
WITH U.S. COMPONENTS 30 - 43465
ITEM: 001
PIECE: 001
CS#: 123456
J050412234
Volts: 240
Poles: 3
Amps: 400
Phase: 3
Hertz: 60
Wire: 3/4
GO No: ABC0123
OF: 001
Page 2 Effective: September 2011
40-400A (480/600Vac) ATC-300+ 3-Postion
Contactor Based Transfer Switch
Section 1: Introduction
WARNING
READ AND UNDERSTAND THE INSTRUCTIONS CONTAINED HEREINAFTER BEFORE ATTEMPTING TO UNPACK, ASSEMBLE, OPERATE,
OR MAINTAIN THIS EQUIPMENT.
HAZARDOUS VOLTAGES ARE PRESENT INSIDE TRANSFER SWITCH
CLOSURES THAT CAN CAUSE DEATH OR SEVERE PERSONAL
EN
INJURY. FOLLOW PROPER INSTALLATION, OPERATION, AND MAINTENANCE PROCEDURES TO AVOID THESE VOLTAGES
TRANSFER SWITCH EQUIPMENT COVERED BY THIS INSTRUCTION
BOOK IS
PLATE RATINGS. OPERATION OUTSIDE OF TH
CAUSE THE EQUIPMENT TO FAIL RESULTING IN DEATH, SERIOUS
BODILY INJURY, AND/OR PROPERTY DAMAGE. ALL RESPONSIBLE
PERSONNEL SHOULD LOCATE THE DOOR MOUNTED EQUIPMENT
NAMEPLATE AND BE FAMILIAR WITH THE INFORMATION PROVIDED
ON THE NAMEPLATE. A TYPICAL EQUIPMENT NAMEPLATE IS
SHOWN IN FIGURE 1.
DESIGNED AND TESTED TO OPERATE WITHIN ITS NAME-
Figure 1. Typical Automatic Transfer Switch (ATS) Equipment
Nameplate.
All possible contingencies that may arise
during installation, operation, or maintenance, and all details and va
ment do no purport to be covered by these instructions. If further
information is desired by the purchaser r
egarding a particular
installation, operation, or maintenance of particular equipment,
please contact an authorized Generac Sales Representative or the
installing contractor.
.
ESE RATINGS MAY
riations of this equip-
1.1 Preliminary Comments and Safety Precautions
This technical document is intended to cover most aspects associated with the installation, application, operation, and maintenance of the Automatic Transfer Controller (ATC-300+)
controlled c
ontactor based ATS with ratings from 40 through
400 amperes (A). It is provided as a guide for authorized and
qualified personnel only. Please refer to the specific WARNING
and CAUTION in Section 1.1.2 before proceeding. If further information is required by the purchaser regarding a particular installation, application, or maintenance activity, plea
se contact an
authorized Generac sales representative or the installing contractor.
1.1.1 Warranty and Liability Information
No warranties, expressed or implied, including warranties of fitness for a particular purpose of merchant
ability, or warranties
arising from course of dealing or usage of trade, are made regarding the information, recommendations and de
scriptions contained
herein. In no event will Generac be responsible to the purchaser
or user in contract, in tort (including negligence), strict liability or
otherwise for any special, indirect, incidental or consequential
damage or loss whatsoever, including but not limited to damage
or loss of use of equipment, plant or power system, cost of capital, loss of power, additional expenses in the use
of existing
power facilities, or claims against the purchaser or user by its
customers resulting from the use of the information and descriptions contained herein.
1.1.2 Safety Precautions
All safety codes, safety standards, and/or regulations must be
strictly observed in the installation, operation, and maintenance
of this device.
WARNING
THE WARNINGS AND CAUTIONS INCLUDED AS PART OF THE PROCEDURAL STEPS IN THIS DOCUMENT ARE FOR PERSONAL SAFETY
AND PROTECT
OF A TYPICAL WARNING LABEL HEADING IS SHOWN ABOVE TO
FAMILIARIZE PERSONNEL WITH THE STYLE OF PRESENTATION.
THIS WILL HELP TO INSURE THAT PERSONNEL ARE ALERT TO
WARNINGS, WHICH APPEAR THROUGHOUT THE DOCUMENT. IN
ADDITION, WARNINGS AND CAUTIONS ARE ALL UPPER CASE AND
BOLDFACE.
ION OF EQUIPMENT FROM DAMAGE. AN EXAMPLE
For more information visit: www.generac.com IB01602078E
CAUTION
COMPLETELY READ AND UNDERSTAND THE MATERIAL PRESENTED
IN THIS DOCUMENT BEFORE ATTEMPTING INSTALLATION, OPERATION, OR APPLICATION OF THE EQUIPMENT. IN ADDITION, ONLY
QUALIFIED
WORK ASSOCIATED WITH THIS EQUIPMENT. ANY WIRING
INSTRUCTIONS PRESENTED IN THIS DOCUMENT MUST BE FOLLOWED PRECISELY. FAILURE TO DO SO COULD CAUSE PERMANENT
EQUI
PERSONS SHOULD BE PERMITTED TO PERFORM ANY
PMENT DAMAGE.
40-400A (480/600Vac) ATC-300+ 3-Postion
Source 1
Source 2
Load
LOGIC
PANEL
VOLTAGE SELECTION AND
TRANSFORMER PANEL
POWER PANEL
Contactor Based Transfer Switch
Instruction Booklet
Effective: September 2011 Page 3
1.2 General Information
Transfer switches are used to protect critical electrical loads
against loss of power. The load’s Source 1 power source is
backed up by a Source 2 power source. A transfer switch is
connected to both the Source 1 and Source 2 power sources and
supplies the load with power from one of the two sources. In the
event that power is lost from Source 1, the transfer switch transfers the load to the Source 2 power source. This transfer is automatic. Once Source 1 power is restored, the load is
automatically trans
(Figure 2).
ferred back to the Source 1 power source
and the Source 2 power source fails while the Source 1 power
source is still unavailable, the ATS remains connected to the
Source 2 power source.
ATSs automatically perform the transfer function and include
e basic elements:
thre
1. A power contactor to connect and disconnect the load to
nd from either power source.
a
2. Solenoids to make the transfer of the main contacts from
source to source.
3. Intelligence/supervisory circuits
condition of the power sources and thus provide the intelligence necessary for the switch and related circuit operation.
to constantly monitor the
1.2.1 Design Configuration
The Generac contactor based ATS is a compact design that uses
a power contactor to transfer essential loads from one power
source to another (Figure 3 [400A]).
Figure 2. Typical Load Transfer Switch Schematic (Contactor
Type).
In ATS equipment, the switch’s intelligence system initiates the
fer when the Source 1 power fails, falls below, or rises
trans
above a preset voltage. If the Source 2 power source is a
standby generator, the ATS initiates generator startup and transfers to the Source 2 power source when sufficient generator
age is available. When Source 1 power is restored, the ATS
volt
automatically transfers back and initiates generator shutdown.
In the event the Source 1 power source fails and the Source 2
power source does not appear, the ATS remains connected to
the Source 1 power source until the Source 2 power source does
appear. Conversely, if connected to the Source 2 power source
Figure 3. Typical Power Panel for a 400A Model.
The Generac contactor based ATS was designed with easy
installation and simplified maint
els comprise the contactor based ATS design:
1. Power panel;
2. Voltage selection and transformer panel (if required); and
3. Microprocessor-based logic panel.
enance in mind. Three main pan-
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Instruction Booklet
AT C 3 C3 X 3 0400 W R U
1to2 3 4 5 6 7 8 9to
12 13 14 15
to
Page 4 Effective: September 2011
40-400A (480/600Vac) ATC-300+ 3-Postion
Contactor Based Transfer Switch
Table 1. Withstand Ratings.
UL 1008 WITHSTAND AND CLOSE-ON RATINGS (kA)
UL 1008 Ampere Rating 480 Volts 600 Volts
Any
Breaker
100 30,000 30,000 22,000 35,000
200 30,000 30,000 22,000 35,000
260 30,000 50,000 – –
320 30,000 50,000 – –
400 30,000 50,000 – –
1.3 ATS Catalog Number Identification
Transfer switch equipment catalog numbers provide a significant
amount of relevant information that pertains to a particular piece
of equipment. The Catalog Number Identification Table (Table 2)
provides the required interpretation information. An example is
offered here to initially simplify the process.
Example: C
atalog Number (circled numbers correspond to position
headings in Table 2).
Specific
Breaker
Any
Breaker
Specific
Breaker
Figure 4. Contactor Based ATS (400A).
Each panel is independently mounted with interconnecting wiring
terminated at the connector receptacles on the ATC-300+ Controller. Door or individual panel removal is achieved without disturbing critical connections by removing the connectors from the
eptacles and cutting the wire ties that secure the wires to the
rec
door.
Mounting the enclosure is simple using top and bottom mounting
flanges with elonga
ing holes, along with power panel positioning bolts and pretapped inse
tial enclosure installation. Refer to Section 4 for specific mounting and modification details.
rts, insure proper power panel mounting after the ini-
ted (teardrop) mounting holes. These mount-
The catalog number ATC3C3X30400WRU describes an ATS with
a 3-pole, 3 position Power Contactor mounted on a baseplate
within the enclosure. The intelligence represented by the logic
panel is ATC-300+ controller. The continuous current rating of
this equipment is 400A and applicable at 240 Vac, 60 Hz. The
transfer switch equipment is enclosed in a NEMA 3R enclosure
and is listed for UL applications.
For more information visit: www.generac.com IB01602078E
Instruction Booklet
40-400A (480/600Vac) ATC-300+ 3-Postion
Contactor Based Transfer Switch
Table 2. Transfer Switch Catalog Number Explanation
POSITIONS 1 TO 2 POSITION 3 POSITION 4 POSITIONS 5 TO 6
BASIC DEVICE SWITCHING DEVICE CONTROL PANEL SWITCHING DEVICE
Automatic Transfer Switch AT Contactor C ATC-300+ Controller 3 3 Position Power Contactor C3
POSITION 7 POSITION 8 POSITIONS 9 TO 12 POSITION 13 POSITION 14 POSITION 15
SWITCHING DEVICE
ARRANGEMENT
Fixed Mount X Two (2) 40A – 0040 208 Vac/60 Hz B Type 1 S UL/CSA Listing U
150A – 0150 380 Vac/50 Hz H Open K
*For 225A to 400A, 600 Vac application, please refer to IB01602024E
NUMBER
OF POLES
Three (3) 80A – 0080 220 Vac/50 Hz G Type 12 J No Listing X
Four (4) 100A – 0100 240 Vac/60 Hz W Type 3R R
AMPERE
RATING
200A – 0200 415 Vac/50 Hz O
*225A – 0225 480 Vac/60 Hz X
*260A – 0260 600 Vac/60 Hz E
*400A – 0400
VOLTAGE/
FREQUENCY ENCLOSURE LISTING
Effective: September 2011 Page 5
1.4 Environmental Conditions
1.4.1 Operational Conditions
Normally, an ATS is applied indoors in an electrical equipment
room. In the appropriate enclosure, it can be used for outdoor
applications where the equipment is subject to falling rain, freez
ing temperatures, and no greater than 90% humidity (non-condensing). The ambient temperature range for operation is
between -20 and 70°C (-4 to 158°F).
1.5 Glossary
With respect to their use within this document and as they relate
to transfer switch and controller operation, the following termi
nology is defined.
Available
A source is defined as “available” when it is within its undervoltage/overvoltage/ underfrequency/overfrequency (if applicable)
setpoint ranges for the nominal voltage and frequency setting.
Connected
Connected is defined as when the input is shorted by an external
contact or connection.
Failed or Fails
A source is defined as “failed” when it is outside of the applicable voltage and frequency setpoint ranges for the nominal voltage and frequency setting for a time exceeding 0.5 seconds
after the time delay emergency fail (TDEF) time delays expires.
Failsafe
Failsafe is a feature that prevents disconnection from the only
available power source and also forces a transfer or re-transfer
operation to the only available power source.
-
Re-Transfer
Re-transfer is defined as a change of the load connection from
the Source 2 to the Source 1.
Source 1
Source 1 is the primary source (normal source, normal power
source, or normal).
-
Source 2
Source 2 is the secondary source (emergency source, emergency power source, emergency, standby, or backup source).
Source 1: Failed or Fails
Source 1 is defined as “failed” when it is outside of its undervoltage/overvoltage/ underfrequency/overfrequency (if applicable) setpoint ranges for the nominal voltage and frequency
setting.
Source 2: Failed or Fails
Source 2 is defined as “failed” when it is outside of its undervoltage/overvoltage/ underfrequency/overfrequency (if applicable) setpoint ranges for the nominal voltage and frequency
setting for a time exceeding 0.5 seconds after the Time Delay
Emergency Fail (TDEF) time delay expires.
Transfer
Transfer is defined as a change of the load connection from the
Source 1 to the Source 2 power source.
Unconnected
Unconnected is defined as when the input is not shorted by an
external contact or connection.
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Instruction Booklet
Page 6 Effective: September 2011
40-400A (480/600Vac) ATC-300+ 3-Postion
Contactor Based Transfer Switch
Section 2: Receiving, Handling, and
Storage
2.1 Receiving
Every effort is made to ensure that the ATS equipment arrives at
its destination undamaged and ready for installation. Packing is
designed to protect internal components as well as the enclo
sure. Care should be exercised, however, to protect the equipment from impact at all times. Do not remove the protective
packaging until the equipment is ready for installation.
When the ATS equipment reaches its destination, the customer
should inspect the shipping container for any obvious signs of
rough handling and/or external damage that occurred during
transportation. Record any external and internal damage for
reporting to the transportation carrier and Generac, once a thor
ough inspection is complete. All claims should be as specific as
possible and include the catalog and General Order numbers.
A shipping label affixed to the shipping container includes a variety of equipment and customer information, such as General
Order Number and catalog numbers. Make certain that this infor
mation matches other shipping paper information.
Each transfer switch is packed securely with appropriate shipping materials to prevent damage during shipment. Do not
remove or discard the packing material until the equipment is
ready for installation.
Once the top packaging is removed from the shipment, the
enclosure door can be opened. A plastic bag of documents will
be found in the enclosure, usually attached to the inside of the
enclosure. Important documents, such as test reports, wiring
diagrams, and appropriate instruction leaflets, are enclosed
within the bag and should be filed in a safe place.
-
2.3 Storage
Although well packaged, this equipment is not suitable for outdoor storage. The equipment warranty will not be applicable if
there is evidence of outdoor storage. If the equipment is to be
stored indoors for any period of time, it should be stored with its
protective packaging material in place. Protect the equipment at
all times from excessive moisture, construction dirt, corrosive
conditions, and other contaminants.
It is strongly suggested that the package-protected equipment be
stored in a climate-controlled environment with temperatures
from -30 to 85°C (-22 to 185°F) and with a relative humidity of
80% or less. DO NOT, under any circumstance, stack other
equipment on top of a transfer switch equipment enclosure,
whether packaged or not.
-
-
2.2 Handling
As previously mentioned, ATS equipment is packaged for forklift
movement. Protect the equipment from impact at all times and
DO NOT double stack.
Once the equipment is at the installation location and ready to be
installed, packaging material can be removed and discarded.
Once the enclosure is unbolted from the wooden pallet, it can be
hand moved to its installation position. Be careful not to damage
the top or bottom enclosure mounting flanges. Refer to Section
4 of this manual for specific installation instructions.
For more information visit: www.generac.com IB01602078E
40-400A (480/600Vac) ATC-300+ 3-Postion
POWER PANEL
LOGIC PANEL
VOLTAGE SELECTION
AND TRANSFORMER PANEL
Contactor Based Transfer Switch
Section 3: Equipment Description
3.1 General
The ATS consists of three basic panels:
1. The power panel;
2. The voltage selection and transformer panel (if required); and
3. The microprocessor-based logic panel.
These panels are interconnected via connector plugs and
mounted in an enclosure (Figure 5
).
Instruction Booklet
Effective: September 2011 Page 7
Figure 5. Three Basic Panels of the ATS (40-400A).
3.2 Power Panel
The power panel is used for making load, power, and neutral connections. The power contactor is mounted on a steel baseplate
(Figure 6).
3.2.1 Main Contacts
This ATS incorporates a power contactor. The main contacts
connect and disconnect the load to and from the different power
sources. The power contactor is mechanically and electrically
interlocked to prevent the two sets of main contacts from being
closed simultaneously.
Figure 6. Typical Power Panel for 40-400A Models.
3.3 Voltage Selection
3.3.1 Standard Voltage Selection (208, 240, 480, 600,
60 Hz and 220, 380, 415, 50 Hz.)
The Standard voltage selection panel consists of multi-tap transformers, contained in a steel case mounted in the enclosure (Figure 7). The voltage is selected by
the default primary taps of both transformers and installing them
on the primary taps for the desired voltage. Taps are provided
for 208 to 600 Vac to satisfy application voltage. The factory
default position is 600 Vac.
simply removing the wires from
CAUTION
WHEN CHANGING THE SELECTED VOLTAGE, THE POWER MUST
BE REMOVED FROM THE ATS AND THE WIRES MUST BE MOVED
ON THE TAPS OF BOTH TRANSFORMERS.
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Instruction Booklet
Page 8 Effective: September 2011
40-400A (480/600Vac) ATC-300+ 3-Postion
Contactor Based Transfer Switch
Figure 7. Standard Voltage Selection Terminals (Shown
Connected to the 480 Vac Taps).
3.4 ATC-300+ Logic Panel
The ATC-300+ is a microprocessor-based transfer switch logic
control package. The hardware and software of the controller
contain the intelligence/supervisory circuits that constantly monitor the condition of the power sources. It provides the intelligence necessary for the operation of the ATS (Figure 8).
Figure 8. ATC-300+ Logic Control Panel.
The ATC-300+ controller has an operating temperature of
-20 to 70°C (-4 to 158°F).
The controller circuit board is protected by an insulating conformal coating.
The specifications, under normal operating conditions, are as follows:
■ Tolerance for voltage sensing function: ±1% of full scale
■ Tolerance for frequency sensing function: ±0.3 Hz of setting
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40-400A (480/600Vac) ATC-300+ 3-Postion
Contactor Based Transfer Switch
Instruction Booklet
Effective: September 2011 Page 9
3.5 Features
A variety of standard and optional features are available for Generac ATSs. All features or combinations of features may not be
available on specific ATSs. All features and/or accessories are
Underwriters Laboratories (UL) listed unless noted.
3.5.1 Standard Features
The following is a list of the standard features for the ATC300+ATC-300+ Controlled ATS.
1. Time Delay Normal to Emergency (TDNE)
This feature provides a time delay when transferring from
the Source 1 to the Source 2 power source. Timing begins
when Source 2 becomes available. It permits controlled
transfer of the load circuit to Source 2.
Adjustable 0 - 1800 Seconds
2. Time Delay on Engine Starting (TDES)
This feature provides a time delay of the signal to initiate
the engine/generator start cycle in order to override
momentary power outages or voltage fluctuations of
Source 1.
Adjustable 0 - 120 Seconds
3. Time Delay Emergency to Normal (TDEN)
This feature provides a time delay of the re-transfer operation to permit stabilization of Source 1. Timing begins
when Source 1 becomes available. If Source 2 fails during
timing, then re-transfer is immediate overriding the time
delay.
Adjustable 0 - 1800 Seconds
4. Time Delay for Engine Cool-down (TDEC)
This feature provides a time delay of the signal to initiate
the engine/generator stop cycle after the re-transfer opera
tion. This allows the engine/generator to cool down by running unloaded. Timing begins on completion of the retransfer cycle.
Adjustable 0 - 1800 Seconds
5. Source 2 Monitoring and Protection
This feature provides monitoring and protection based on
the Source 2 voltage and/or frequency setpoints. All fea
ture 5 functions are Failsafe operations.
-
5H. Phase Reversal
For a 3-phase wye source, this feature monitors the phase
sequence of the sources. If a source does not have the
same ABC or CBA sequence as the setpoint value, that
source will be considered “Unavailable.
For a 3-phase delta source, this feature should be turned off
via the PHASE REV setpoint.
5J. All Phase Undervoltage and Underfrequency Protection
Adjustable Undervoltage:
Dropout: 78 - 97% of nominal
Pickup: (Dropout +2%) to 99% of nominal
Adjustable Underfrequency:
Dropout: 90 - 97% of nominal
Pickup: (Dropout +1Hz) to 99% of nominal
5K. All Phase Overvoltage/Overfrequency
Adjustable Overvoltage:
Dropout: 105 - 110% of nominal
Pickup: 103% to (Dropout –2%) of nominal
Adjustable Overfrequency:
Dropout: 103 - 105% of nominal
Pickup: 101% to (Dropout -1Hz) of nominal
-
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Instruction Booklet
Page 10 Effective: September 2011
40-400A (480/600Vac) ATC-300+ 3-Postion
Contactor Based Transfer Switch
5L. Source 2 3-Phase Voltage Unbalance
For a 3-phase wye source, this feature monitors phase voltage ratios. Voltage unbalance (%) is calculated as the difference between the maximum and minimum phase
voltage, divided by the minimum phase voltage. Userselectable setpoints are available for dropout and pickup
unbalance settings (minimum 2% differential). Dropout is
adjustable from 5 to 20%. Pickup is adjustable from 3 to
(Dropout –2%). A setpoint for user-selectable time delay
from 10 to 30 seconds is provided. The factory default setpoints are: 5% dropout, 3% pickup, and 30 seconds time
delay. A user-selectable setpoint for enable and disable is
also provided.
When an unbalance condition is detected on Source 2, the
Unbalance Timer (TD UNBAL) starts timing. After TD
UNBAL times out, Source 2 is declared “failed”.
For a 3-phase delta source, this feature should be turned off
via the VOLT UNBAL setpoint.
6. Test Operators
Generac ATSs are provided with a Test Pushbutton that
simulates a loss of the Source 1 power source as standard
(Feature 6B). All programmed time delays (TDNE, TDEN,
etc.) will be performed as part of the Test. Engine run time
of the Test is equal to the Plant Exerciser (Feature 23) pro
grammed setpoint. All Tests are Failsafe protected.
6B. Test Pushbutton
Programmable setpoints include:
1. Load or No Load Testing, or Disabled
2. Engine run time equal to the plant exerciser
(Feature 23) setting
7. Time Delay Emergency Fail (TDEF)
This feature provides a time delay that prevents a connected Source 2 power source from being declared “Failed”
in order to override momentary generator fluctuations. If
the Source 2 power source remains in the failed state then,
0.5 seconds after the TDEF timer expires, the transfer
switch will proceed with the programmed sequence for
retransfer. This time delay is only implemented when the
Source 2 power source is a generator.
Adjustable 0 - 6 Seconds
8. Time Delay Bypass Pushbutton
This feature provides a way (by pushing the Help and Step
pushbutton simultaneously) to bypass the TDNE (Feature 1)
and/or TDEN (Feature 2) time delays. The Time Delay
Bypass function, when activated by pushing the Help and
Step pushbutton simultaneously, will reduce any or all of
the programmed time delay to zero.
8C. Bypass TDEN
This feature provides one set of pushbuttons to bypass the
TDEN time delay.
8D. Bypass TDNE
This feature provides one set of pushbuttons to bypass the
TDNE time delay.
12. Power Source Annunciation
This feature provides LEDs to give switch position and
power source availability indications.
Switch Position
Provides LEDs to indicate the switch position
12C. Source 1 - Source Connected
This feature provides a green LED that, when lit, indicates
the load is connected to Source 1.
12D. Source 2 - Source Connected
This feature provides a red LED that, when lit, indicates the
load is connected to Source 2.
Power Source Availability
Provides LEDs to indicate if a power source is available.
LEDs may be integral or separate from the controller.
12G. Source 1 - Available
This feature provides a white LED that, when lit, indicates
Source 1 is available.
12H. Source 2 - Available
-
This feature provides an amber LED that, when lit, indi-
cates Source 2 is available.
14. Relay Auxiliary Contacts
14G. Source 1 Present: Provides two (2) normally open and two
(2) normally closed contacts. The relay is energized when
Source 1 is available.
14H. Source 2 Present: Provides two (2) normally open and two
(2) normally closed contacts. The relay is energized when
Source 2 is available.
15. Switch Position Indication Contact
This feature provides a contact that indicates if the power
switching device is in the “Open” or “Closed” position.
15E. Source 1 Position Indication Contact
This feature provides 1 dry form “C” contact that indicates
the position of the Source 1 power switching device.
15F. Source 2 Position Indication Contact
This feature provides 1 dry form “C” contact that indicates
the position of the Source 2 power switching device.
23. Plant Exerciser (PE)
This feature provides a means for automatic testing of the
engine generator set or standby power system. All pro
grammed time delays will be performed during plant exerciser operations.
-
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40-400A (480/600Vac) ATC-300+ 3-Postion
Contactor Based Transfer Switch
Instruction Booklet
Effective: September 2011 Page 11
23K. Plant Exerciser Selectable – Disabled/1/7/14/28 Day Inter-
val
This feature provides for automatic test operation of the
generator. Available test cycles are daily, 7, 14, or 28
days with duration equal to the programmed engine test
time.
Programmable setpoints allow for selection of three test
cycles:
■ Engine Start/Run Only (No Load);
■ Exercise with Load Transfer; or
■ Disabled
This is a “Failsafe” operation.
26. Source 1 - Monitoring and Protection
This feature provides Source 1 monitoring and protection
functions. If the Source 1 power supply fails, then the
Automatic Transfer Controller will begin the sequence of
operations necessary to transfer the load circuit to the
Source 2 power supply. All Feature 26 monitoring and
protection functions are Failsafe operations.
26D. Go to Source 2
This feature provides the capability for an external contact
opening to initiate a load circuit transfer to the Source 2
power source. This includes starting the engine/generator,
performing the programmed time delays, and the transfer
operation. Re-transfer will occur when the external con
tact is closed or under a Failsafe condition.
26H. Phase Reversal Protection
For a 3-phase wye source, this feature monitors the phase
sequence of the sources. If a source does not have the
same ABC or CBA sequence as the phase reversal set
point, the source will be considered “Unavailable”.
For a 3-phase delta source, this feature should be turned
off via the PHASE REV setpoint.
26J. All Phase Undervoltage and Underfrequency Protection
Adjustable Undervoltage:
Dropout: 78 - 97% of nominal
Pickup: (Dropout +2%) to 99% of nominal
Adjustable Underfrequency:
Dropout: 90 - 97% of nominal
Pickup: (Dropout +1Hz) to 99% of nominal
26K. All Phase Overvoltage/Overfrequency
Adjustable Overvoltage:
Dropout: 105 - 110% of nominal
Pickup:103% to (Dropout –2%) of nominal
Adjustable Overfrequency:
Dropout: 103 - 105% of nominal
Pickup: 101% to (Dropout -1Hz) of nominal
-
-
26L. Source 1 3-Phase Voltage Unbalance
.For a 3-phase wye source, this feature monitors phase
voltage ratios. Voltage unbalance (%) is calculated as the
difference between the maximum and minimum phase
voltage, divided by the minimum phase voltage. Userselectable setpoints are available for dropout and pickup
unbalance settings (minimum 2% differential). Dropout is
adjustable from 5 to 20%. Pickup is adjustable from 3 to
(Dropout –2%)). A setpoint for user-selectable time delay
from 10 to 30 seconds is provided. The factory default
setpoints are: 5% dropout, 3% pickup, and 30 seconds
time delay. A user-selectable setpoint for enable and disable is also provided.
When an unbalance condition is detected on Source 1, the
Unbalance Timer (TD UNBAL) starts timing. After TD
UNBAL times out, Source 1 is declared “failed”.
For a 3-phase delta source, this feature should be turned
off via the VOLT UNBAL setpoint.
29. Alternate Transfer Modes of Operation
Provides standard or optional transfer modes, mode selection devices, and operational methods for ATSs.
29J. Type of Operation (MANTR) Operation (new feature)
This feature provides for a selection between an automatic
transfer and re-transfer mode or a manual pushbutton retransfer to Normal from the Emergency Source mode. If
this option is not selected the factory default selection is
automatic.
32. Delayed Transition Transfer Modes for Open Transition
Transfer Switches
This feature provides delayed transition transfer modes
for an open transition transfer switch. Often used in sys
tems with inductive loads, a delayed transition transfer
switch may prevent or reduce in-rush currents due to out
of phase switching of inductive loads.
32A. Time Delay Neutral
This feature provides a time delay in the neutral position
during the transfer and re-transfer operations during
which both Source 1 and Source 2 are disconnected from
the load circuit. The time delay is programmable and is
the same for both transfer and re-transfer operations.
Adjustable 0 - 120 Seconds
35. Pre-Transfer Signal
This feature provides a signal to a remote device prior to a
re-transfer operation. It provides one Form “C” contact
(NO/NC) for interface with other equipment (typically ele
vator controls). The contacts close/open on a timed basis
prior to transfer in either direction. After TDNE/TDEN
times out, this relay closes and the Pre-transfer Timer
(TPRE) starts timing. After the TPRE times out, the trans
fer proceeds by starting the TDN timer if enabled. The
pre-transfer relay opens after the transfer is complete.
Adjustable 0 - 120 Seconds
35A. Pre-Transfer Signal with 1 N.O. and 1 N.C. Contacts
This feature provides pre-transfer signal and includes 1
N.O. and 1N.C. contacts.
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IB01602078E For more information visit: www.generac.com
Instruction Booklet
Page 12 Effective: September 2011
40-400A (480/600Vac) ATC-300+ 3-Postion
Contactor Based Transfer Switch
36. Emergency Inhibit (new feature)
This feature enables the Emergency inhibit control input to
inhibit transfers to the Emergency Source. See Control
Inputs section for more information.
This input is located on Pins 7 and 8 of Connector J8 and
is enabled when the Emergency Inhibit is enabled. The con
tact is closed for normal operation. Opening this contact
will activate the Emergency Inhibit input.
If the Emergency Inhibit contact is opened when the load is
connected to the Normal Source, no action will be taken if
the Normal Source is available. If the Normal Source is not
available, an immediate transfer to the neutral position will
occur.
If the Emergency Inhibit contact is opened when the load is
connected to the Emergency Source, the ATC-300+ will
transfer the load to the Normal Source if it is available. If
the Normal Source is not available, an immediate transfer
to the neutral position will occur.
The Emergency Inhibit input is only active when either
Source 1 or Source 2 is preferred. This input is not active
when the Preferred Source selection is set to None.
The Emergency Inhibit input takes priority over the Go To
Emergency input if both inputs are activated at the same
time. In this case, the generator will start but a transfer to
the Emergency Source will be inhibited until the Emergency
Inhibit input is de-activated.
42. Seismic Withstand Capability
Provides transfer switch with seismic capability exceeding
the worst case Zone 4 required per both the Uniform Build
ing Code and the California Building Code.
48F. RS-485 with Modbus Option
Provides communications for the ATC-300+ via Modbus
through an integrated RS-485 port. Registers are available
to read back status, voltages, frequencies, and historical
data. Registers are also available for transfer switch con
trol. Setpoints may be read back and/or programmed via a
pass-through command. See the ATC-300+ Modbus Com
munication Guide pn: 66A7787.
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3.5.2 Optional Features
The following is a list of the optional features for the ATC-300+
Controlled ATS. All features or combinations of features may not
be available on specific ATSs
9B. Maintenance Selector Switch (MSS)
Marked “OFF”, “ON”. This feature provides selector
switch disconnection of control to transfer thus allowing
testing of the transfer switch control logic circuitry with
out initiating load transfer. Positioning the MSS in the
“OFF” position isolates the control circuit, permitting man
ual operation of the transfer switch or testing of logic circuitry without load transfer. White indication light is lit ON
and display on ATC-300 controller shows “ATS NOT IN
AUTOMATIC” when the switch is in maintenance mode.
14. Relay Auxiliary Contacts: This feature provides form “C”
relay auxiliary contacts.
14C. Source 1 Present: Provides four (4) normally open and four
(4) normally closed contacts. The relay is energized when
Source 1 is available.
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14D. Source 2 Present: Provides four (4) normally open and four
(4) normally closed contacts. The relay is energized when
Source 2 is available.
15. Switch Position Indication Contact
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This feature provides a contact that indicates if the power
switching device is in the “Open” or “Closed position.
15G. Source 1 Position Indication Contact
This feature provides 3 Dry Form “C” contacts that indicate the position of the Source 1 power-switching device.
15H. Source 2 Position Indication Contact
This feature provides 3 Dry Form “C” contacts that indicate the position of the Source 2 power-switching device.
18. Metering
This feature includes all required external devices (CTs,
shorting blocks, fuses, etc.) for a fully functional metering
system.
18AN. IQ 250/260 Normal (S1) Only
18AE. IQ 250/260 Emergency (S2) Only
18AL. IQ 250/260 Load
18CN. IQ 110/115 Normal (S1) Only
18CE. IQ 110/115 Emergency (S2) Only
18CL. IQ 110/115 Load
18DN. IQ 130/140/150 Normal (S1) Only
18DE. IQ 130/140/150 Emergency (S2) Only
18DL. IQ 130/140/150 Load
18EN. PXM2250/2260/2270 Normal (S1) Only
18EE. PXM2250/2260/2270 Emergency (S2) Only
18EL. PXM2250/2260/2270 Load
18O. IQ Analyzer Normal (S1) Only
18P. IQ Analyzer Emergency (S2) Only
18Q. IQ Analyzer Normal (S1) & Emergency (S2) Switch Select-
able
18V. IQ Analyzer Load
18R. IQ DP-4000 Normal (S1) Only
18S. IQ DP-4000 Emergency (S2) Only
18T. IQ DP-4000 Normal (S1) & Emergency (S2) Switch Select-
able
18U. IQ DP-4000 Load
18W. Ammeter
A single ammeter is a true RMS sensing device that displays single phase current only.
The ammeter can be mounted on Source 1, Source 2, or
load. The meter can also be configured for 1, 2, or 3-phase
sensing by supplying one meter per phase for Source 1,
Source 2, or load. Ammeters for both Source 1 and Source
2 can also be grouped together.
For more information visit: www.generac.com IB01602078E