Magnum Dimensions ME-AGS-S User manual

Owner’s Manual
ME-AGS-S
Automatic Generator Start
for Standalone Systems

© 2016 Sensata Technologies i
Thank you from all of us at Sensata Technologies for purchasing this
ME-AGS-S controller. The ME-AGS-S is a product under the Magnum-
Dimensions brand from Sensata Technologies. We understand that
you have many purchasing options in the marketplace, and are
pleased that you have decided on this product. This AGS-S controller
was proudly assembled and tested in the United States.
At Sensata we are committed to providing you with quality products
and services. We hope your experience with us is positive.
Disclaimer of Liability
Since the use of this manual and the conditions or methods of
installation, operation, use and maintenance of the ME-AGS-S (Auto
Generator Start – Standalone) is beyond the control of Sensata
Technologies, this company does not assume responsibility and
expressly disclaims liability for loss, damage or expense, whether
direct, indirect, consequential or incidental, arising out of or anyway
connected with such installation, operation, use, or maintenance.
Note as well that while every precaution has been taken to ensure
the accuracy of the contents of this manual, the specifications
and product functionality may change without notice. Sensata
Technologies assumes no responsibility for errors or omissions.
Restrictions on Use
The ME-AGS-S may only be used in life-support devices or systems
with the express written approval of Sensata Technologies. Failure
of the ME-AGS-S can reasonably be expected to cause the failure
of that life-support device or system, or to affect the safety or
effectiveness of that device or system. If the ME-AGS-S fails, it is
reasonable to assume that the health of the user or other persons
may be endangered.
Copyright Notice
Copyright © 2016 by Sensata Technologies. All rights reserved.
Permission to copy, distribute, and/or modify this document is
prohibited without express written permission by Sensata.
Document Information
Description – ME-AGS-S Owner’s Manual
Part Number and Revision – 64-0004 Rev C
Date Published – March 2016
This manual is printed without color for cost savings. However, this
entire manual can be downloaded from our website (see below) with
many diagrams available in color.
Contact Information
Sensata Technologies
2211 West Casino Rd.
Everett, WA 98204
Phone: [phone], Fax: [phone]
Web: www.Magnum-Dimensions.com

ii © 2016 Sensata Technologies
Product Safety Information
IMPORTANT PRODUCT SAFETY INSTRUCTIONS
This manual contains safety instructions that must be followed during
the installation and operation of this product. Read all instructions
and safety information contained in this manual before proceeding.
Safety Symbols
To reduce the risk of electrical shock, fire, or other safety hazard, the
following safety symbols have been placed throughout this manual
to identify dangerous situations and important safety instructions.
WARNING: Indicates that failure to take a specified action
could result in physical harm to the user.
CAUTION: This symbol indicates that failure to take a specified
action could result in damage to the equipment.
Info: This symbol indicates information that emphasizes or
supplements important points of the main text.
Product Safety Alerts
WARNING:
• All electrical work must be performed in accordance with
local, state, and federal electrical codes.
• This product is designed for indoor and compartment
installation. Do not expose to rain, snow, moisture, or
liquids of any type.
• Use insulated tools to reduce the chance of electrical
shock or accidental short circuits.
WARNING: Severe personal injury, death, and equipment
damage can result from operating the generator in a garage,
building, or a confined space. The generator produces
dangerous fumes when it is running. If the generator is
installed in an RV, disable the AGS system to prevent
the generator from starting when the RV is in a confined
space.
WARNING: ENGINE EXHAUST GASSES CAN BE DEADLY.
Install a reliable carbon monoxide alarm in your vehicle,
building, or home before starting a generator or enabling
the AGS. All engine exhaust contains carbon monoxide: an
odorless, colorless gas that can cause severe personal injury/
death. Symptoms of CO poisoning:
• dizziness, headache or throbbing temples,
• weakness or muscular twitching,
• sleepiness or confusion, and nausea or vomiting
If you experience any of the above symptoms, get to fresh
air immediately. If symptoms persist, seek medical attention.
Shut down the generator and do not operate until the unit is
inspected and repaired.

© 2016 Sensata Technologies iii
Product Safety Information
WARNING: With an AGS system installed, exhaust CO,
electrical shock, and moving parts hazards are possible due
to unexpected engine/generator starting. Disconnect the
engine/generator starting battery cables or AGS connection
to the engine/generator before working on the generator or
any other electrical system powered by it.
• Remove all jewelry (such as rings, watches, bracelets, etc.)
when installing or performing maintenance on your batteries
and the inverter system.
• Always disconnect the batteries or energy source prior to
installing or performing maintenance on your batteries and
inverter system. Live power may be present at more than one
point since an inverter utilizes both batteries and AC. Turning
off the inverter may not reduce this risk. As long as AC power
is connected, it will pass through the inverter regardless of
the power switch on the inverter or the ON/OFF INVERTER
pushbutton on the remote/router.
• Wear eye protection—such as safety glasses—when working
with batteries.
• Never work alone. Always have someone near you when working
around batteries.
• Never use old or untested batteries. Check each battery’s label
for age, type, and date code to ensure all batteries are identical.
• Batteries are sensitive to changes in temperature. Always install
batteries in a stable environment.

iv © 2016 Sensata Technologies
Table of Contents
1.0 Introduction................................................................1
1.1 ME-AGS-S Components/Features .................................. 2
1.1.1 AGS Remote Switch .................................................... 2
1.1.2 AGS Controller ........................................................... 3
1.1.3 Communication Cable ................................................. 4
2.0 Installation .................................................................5
2.1 Installation Requirements ............................................ 5
2.2 Required Components and Tools ................................... 7
2.2.1 Supplied Components ................................................. 7
2.2.2 Other Required Equipment and Materials ....................... 7
2.2.3 Required Tools ........................................................... 7
2.3 Mounting Procedure .................................................... 7
2.3.1 Mounting the AGS Controller ........................................ 7
2.3.2 Mounting the AGS Remote Switch ................................. 7
2.4 Connecting the Communication Cable............................ 9
2.4.1 Communication Cable ................................................. 9
2.5 ME-AGS-S Terminal Block Wiring .................................. 9
2.5.1 Power Connections (Terminals 3 and 4) ........................10
2.5.2 Generator Run Sense Connection (Terminal 2)...............10
2.5.3 Gen Start/Stop Connections (Terminals 1, 5, 6, 7, & 8) ...12
2.6 Common ME-AGS-S Generator Wiring Diagrams ............13
3.0 Setup ........................................................................19
3.1 Internal Settings .......................................................19
3.2 External Settings.......................................................21
3.3 AGS Functional Tests..................................................23
3.3.1 Power-Up Test...........................................................23
3.3.2 Generator Wiring Test ................................................23
4.0 Operation..................................................................24
4.1 AGS Controller LED Indicators .....................................24
4.1.1 TEST Switch .............................................................24
4.1.2 STATUS LED Indicator ................................................24
4.1.3 READY LED Indicator..................................................24
4.2 Remote Switch Operation ...........................................25
4.2.1 Switch Positions ........................................................25
4.2.2 STATUS LED Indicator ................................................26
4.3 AGS System Operation ...............................................26
4.3.1 Operational Notes......................................................27
5.0 Troubleshooting........................................................28
A-1 Appendix...................................................................29
A-1.1 Optional Accessories for the ME-AGS-S.........................29
A-1.2 Additional Magnum Equipment/Accessories ...................29
Limited Warranty ..............................................................30
How to Receive Repair Service ...............................................31

© 2016 Sensata Technologies v
List of Tables
Table 3-1, GEN TYPE Settings.................................................20
Table 3-2, ME-AGS-S Default Settings .....................................21
Table 5-1, Troubleshooting Guide ............................................28
List of Figures
Figure 1-1, ME-AGS-S Remote Switch Features.......................... 2
Figure 1-2, ME-AGS-S Controller Features................................. 4
Figure 1-3, ME-AGS-S Communications Cable ........................... 4
Figure 2-1, ME-AGS-S System Diagram .................................... 6
Figure 2-2, Controller Dimensions............................................ 8
Figure 2-3, Remote Dimensions............................................... 8
Figure 2-4, Communication Cable Connection............................ 9
Figure 2-5, Communication Cable (Data Type)........................... 9
Figure 2-6, Generator Run Sense Options ................................11
Figure 2-7, Wiring to the AGS Controller’s Terminal Block...........13
Figure 2-8, Warning Label......................................................14
Figure 2-9, Two-wire Start Control ..........................................15
Figure 2-10, Three-wire Momentary Control .............................16
Figure 2-11, Three-wire Maintain Control .................................17
Figure 2-12, Three-wire Momentary Control (with Preheat) ........18
Figure 3-1, Inside the AGS Controller ......................................19
Figure 3-2, DC Voltage Settings..............................................19
Figure 3-3, External Settings..................................................21
Figure 4-1, Controller Front Panel Controls and Indicators ..........25
Figure 4-2, Remote Switch Controls and Indicators ...................26

1 © 2016 Sensata Technologies
Introduction
1.0 Introduction
The Automatic Generator Start – Standalone version (ME-AGS-S)
from Sensata is designed as a standalone device. It will automatically
start your generator based on low battery voltage and/or a high
temperature condition.
Info: See Figure 3-1 for information on how to identify your
ME-AGS’s revision level.
Info: If you are using a Sensata inverter/charger (provided
with a network port) and a ME-RC or ME-ARC remote, use
the ME-AGS-N (AGS – Network version) for full network
capability of the AGS system.
This AGS is used to continuously monitor your battery system and/
or the surrounding area temperature, and to automatically start the
generator when the battery requires charging and/or power is needed
to run an air conditioner to cool down the surrounding area.
The temperature turn-on feature is useful in many applications. For
example, if you have an RV (recreational vehicle) coach in a hot
environment, the AGS monitors the coach temperature and turns on
the generator to power the air conditioner. This allows you to leave
pets and precious items in your coach while you are away—all the
while knowing your coach will stay cool and comfortable. Even if you
don’t have pets, there’s nothing better than returning to a nice cool
coach while dry camping in hot weather. Plus, no more worrying
about dead batteries.
The AGS system includes a controller with on-board adjustments and
interfaces, and a user-friendly remote control switch. The controller
provides the wiring interface for the battery bank and generator
start/stop circuits. It has adjustments for setting the generator’s
run time, high temperature start, and low battery voltage start;
and if needed, the Clock and Quiet Time adjustments can be set to
comply with RV park/rest area nighttime low noise requirements.
The remote switch allows testing and activating the AGS system, and
provides a LED indicator to display AGS system status information.
This AGS is compatible with most AC or DC generators with
either two-wire or three-wire start controls; such as Onan, Power
Tech, Generac, Martin, Kohler, Honda, Westerbeke, Yamaha, and
many others. For a list of generators that have been successfully
used with the AGS (& their respective wiring diagrams), visit:
www.Magnum-Dimensions.com.
The standalone AGS is equipped with the following features:
• Compatible with 12, 24, or 48-volt systems
• Easily adjustable settings for run-time, low voltage, and high
temperature start
• Quiet Time setting to prevent generator operation during
nighttime hours

© 2016 Sensata Technologies 2
Introduction
1.1 ME-AGS-S Components/Features
The ME-AGS-S has the following components and features:
• AGS Remote Switch • AGS-S Controller • Communication cable
1.1.1 AGS Remote Switch
The AGS remote switch is the user interface display, and connects to
the AGS controller using the supplied communications cable. Refer
to Figure 1-1.
1Selector Switch – allows the AGS system to be enabled/
disabled for automatic generator operation and tested for
correct wiring.
• ENABLE – activates the AGS to monitor voltage and/or
temperature—uses this information to determine when to
automatically start the generator.
• OFF – disables the AGS generator start/stop functions.
• TEST – initiates an automatic generator start/stop
sequence for testing the generator’s wiring and operation.
2STATUSIndicator– this bi-color (green or red) LED indicator
illuminates to provide information on AGS operation.
3Temperature Sensor (internal) – location of the
internal sensor used to start the generator (based on high
temperature).
Figure 1-1, ME-AGS-S Remote Switch Features
2
1
3
• Compatible with any inverter/charger-based system
• Compatible with most AC or DC generators with either two-wire
or three-wire start controls
• TEST switch provides immediate confirmation of installation
wiring
• Removable 8-port terminal block for easy wiring and power-
down
• Front panel LED indicators for generator start/stop status and
generator faults

3 © 2016 Sensata Technologies
Introduction
1.1.2 AGS Controller
The AGS controller provides adjustments and the generator’s wiring
connections. Refer to Figure 1-2.
1AGS Adjustments (x5) –The thumb wheel adjustments
allow the AGS to be configured to your specific system
preferences.
• RUN TIME HOURS – determines the length of time the
generator runs once it is automatically started.
• START TEMP °F – allows you to
enable and set a
high temperature value that causes the generator to
automatically start.
• START VOLTS DC – allows you to enable and set a
low battery voltage value that causes the generator to
automatically start.
• CLOCK AM/PM – determines the correct time, which in
turn allows the Quiet Time feature to function correctly.
• QUIET TIME PM/AM – used to prevent the generator from
starting during specific hours.
2STATUSIndicator– this bi-color (green or red) LED indicator
illuminates to provide information on AGS operation.
3TEST Switch – a momentary pushbutton switch that allows
the AGS system to be tested for correct wiring and generator
start/stop operation.
4Wiring Terminal Block – this 8-port friction-fit connector
powers the AGS and connects the generator’s start/stop and
run sense wires.
5Mounting Flange – used to secure the inverter to a shelf
or wall.
6READY Indicator – this green LED indicator illuminates to
indicate that the AGS is powered and the remote switch is
connected.
7REMOTE Connection Port (purple label) – a RJ12 port
which provides the connection point for the remote switch.

© 2016 Sensata Technologies 4
Introduction
6
7
51
2
3
4
Figure 1-2, ME-AGS-S Controller Features
1.1.3 Communication Cable
A six-conductor, 25-foot RJ12 cable used to carry power and data
between the remote and the AGS controller. See Figure 1-3.
Info: See Figure 2-5 for a close-up of the communications
cable’s conductor wiring.
Figure 1-3, ME-AGS-S Communications Cable

5© 2016 Sensata Technologies
Installation
2.0 Installation
Installing the ME-AGS-S is a simple process. Before installing, read
this entire section to familiarize yourself with all aspects of the
installation; then, you can thoroughly plan the details to ensure
the overall system requirements are accomplished. To assist you in
planning and designing your installation, review the basic system
diagram shown in Figure 2-1.
WARNING: The ME-AGS-S is not an ignition-protection
rated device and should not be installed in any location that
requires ignition-protected equipment. To prevent fire or
explosion, do not install the AGS controller in any area with
extremely flammable liquids like gasoline or propane; or, in
an area that contains connections between components of
a fuel system.
CAUTION: Installation should be performed by qualified
personnel, such as a licensed or certified electrician.
The installer is responsible for determining which safety
codes apply and for ensuring that applicable installation
requirements are followed. Applicable installation codes vary
depending on the specific location and application.
CAUTION: Review the “Important Product Safety Information”
on pages ii-iii before any installation.
2.1 Installation Requirements
Review the following requirements before installing this device:
• For the AGS to automatically start and stop the generator
properly, the generator must include an electric start and
an automatic choke. To prevent generator damage and
obtain reliable operation, use generator models designed for
unattended operation. These models should also be equipped
with remote operation connections and have protective systems
that cause the generator to shut down during low oil pressure,
over-temperature, starter lockout, and over-crank conditions.
• The ME-AGS-S controller is connected to the remote switch by a
25’ communications cable. Before installing the ME-AGS-S and
connecting any wires, determine: 1) the communications cable
route throughout the home or vehicle/boat from the controller
to the remote switch, 2) the start/stop signal wire route from
the AGS controller to the generator, and 3) the wire route from
the AGS controller to the monitored battery bank.
Info: Sensata offers two pigtail adapters (ME-PT1 and ME-
PT2) that externally enable the ME-AGS-S to automatically
turn the generator on/off via a manually controlled switch or
an automatically controlled switching device. See Appendix
A for more information.

© 2016 Sensata Technologies 6
Installation
ME-AGS-S
Automatic Generator Start
(Standalone version)
Monitored Battery Bank Auto-Start Generator
Generator start/stop wiring
Generator run signal
Battery positive voltage
Remote connection
Common battery negatives
(Monitored battery and
Generator starting battery)
Figure 2-1, ME-AGS-S System Diagram
• Always check for existing electrical, plumbing, or other areas of
potential damage BEFORE drilling or cutting into walls.
• If installing this device in a boat, RV, or truck, ensure the
conductors passing through walls, bulkheads, or other structural
members are protected to minimize insulation damage such as
chafing—which can be caused by vibration or constant rubbing.
• Do not mount the AGS controller in a closed battery compartment,
or in an area where water or any other liquid can enter the AGS
and cause shorting or corrosion.
• The AGS should be wired to not interfere with your AC’s controls
or the manual start/stop switches on your generator.

7© 2016 Sensata Technologies
Installation
2.2 Required Components and Tools
2.2.1 Supplied Components
• ME-AGS-S Owner’s Manual
• AGS Controller (four #8 x 3/4” Phillips mounting screws)
• AGS Switch/Bezel (two #6 x 1” Phillips mounting screws)
• 25 ft Communications Cable
2.2.2 Other Required Equipment and Materials
• #16 to #12 AWG (1.3 mm2to 3.3 mm2) wire for connecting
the ME-AGS-S to the generator and to the battery bank
• In-line fuse holders (with 5-amp DC fuse)
2.2.3 Required Tools
•Phillips screwdriver (#2)
• Flat-blade screwdrivers
(1/4” and 1/8” blades)
•Wire stripper
• Cut-out tool (knife)
• Drill bits (7/64” & 1/8”)
•Drill
• Level
• Pencil
2.3 Mounting Procedure
2.3.1 Mounting the AGS Controller
Mount the controller in a location that is clean, dry, and protected
from extreme temperatures
. Wiring is much easier if the controller
is mounted within easy access to the generator’s remote switch
wiring. Refer to Figure 2-2 for the controller’s dimensions.
Info: The controller/remote switch can be mounted in any
direction. However, allow ample room to
access the remote
switch and the controller’s
adjustment dials, and to view the
LEDs for operational status and troubleshooting.
Note: Remove the green 8-pin friction fit connector from the controller—
pull straight out—before mounting the AGS. Do not re-connect until
after the installation is completed and functional tests are performed.
Mount the AGS controller using the four #8 x 3/4” screws provided.
2.3.2 Mounting the AGS Remote Switch
Mount the remote switch in a location that is convenient, clean, dry,
and protected from extreme temperatures.
Info: The temp sensor used to activate the temperature
turn-on feature is located on the back of the AGS remote
switch. If using the temperature turn-on feature, the switch
must be placed where the sensor can accurately determine
room temperatures. DO NOT mount near window drafts or
heating and air conditioning ducts, and not on exterior walls.
1. Cut a hole for the remote switch. See Figure 2-3 for dimensions.
2. Plug the communications cable into the RJ12 connector on
the back of the AGS switch (Section 2.4), and then feed the
communications cable (6-conductor data cable) through the
opening and route it to the AGS.

© 2016 Sensata Technologies 8
Installation
Figure 2-3, Remote Dimensions
Figure 2-2, Controller Dimensions
5
16
1"
3
16
"
2" (50.8 mm)
2"(70.5 mm)
3
4
3
8"
(9.8 mm)
~
3
8"
(9.8 mm)
~
4"(106.4 mm)
16
3
4"(124.5 mm)
8
7
~(4.1 mm) 5"(137.2 mm)
8
3
(33.3 mm)
3 " (82.5 mm)
3 " (90.5 mm)
4
1
16
9
cut
out
"
drill bit
2
"
1
"
1
8
7
64
2
"
3
4
(7.0 cm)
2
"
1
8
(5.4 cm)
3
"
7
16
(8.7 cm)
(2.9 cm)
(5.9 cm)
1"
1
4
(3.2 cm)
5
16
(11 mm)
ENABLE
OFF
TEST STATUS
AUTO GEN START
(3 cm)
1
3
16
(4.1 cm)
1
8
5
"
"
Remote
side
Remote
Bezel
Remote
face-plate
Info: Use care in routing the cable to ensure it does not
become pinched or cut by rough or sharp edges. Leave enough
slack to allow movement of the cable once installed.
3. Mount the switch & bezel using the two #6 x 1” screws provided.

9© 2016 Sensata Technologies
Installation
2.4 Connecting the Communication Cable
After connecting one end of the communication cable to the back of
the AGS remote switch, connect the other end of the cable to the
REMOTE port (purple label) on the AGS controller (see Figure 2-4).
Info: The communication cable is a 6-conductor, flat, data
standard with RJ12 (6-position/6-wire) connectors on each end
(see Figure 2-5). The 25’ communications cable may be
extended to a maximum of 250 feet if needed.
Remote Switch
(backside)
Communications
Cable
Figure 2-4, Communication Cable Connection
Figure 2-5, Communication Cable (Data Type)
123456 123456
white
blue TAB
TAB
Same colors from
top to bottom
(tabs facing toward you)
2.4.1 Communication Cable
The 6-conductor communications cable has a RJ12 (6-position/6-
wire) connector on each end and is wired as a data type cable. This
means that when the RJ12 connectors are held side by side with
both of the connector tabs facing the same way, the color of the
conductors in each connector is the same from top to bottom (as
shown in Figure 2-5).
2.5 ME-AGS-S Terminal Block Wiring
Refer to Figure 2-7 when wiring the generator to the controller’s
terminal block.
The AGS should already be mounted and the 8-port friction-fit
terminal block unplugged (pull straight out). Ensure the terminal
openings are unscrewed enough to allow wires to be inserted.

© 2016 Sensata Technologies 10
Installation
CAUTION: DO NOT plug in the 8-port terminal block. After
all the wiring to the controller is complete and all the settings
have been configured, a power-up test will be performed
(Section 3.3.1). DO NOT plug in the 8-port terminal block
until the power-up test has been successful.
You must use a fuse rated at ≤5 amps to protect all power
circuits connected to the AGS (do not fuse the negative
connection on Terminal #4). Ensure the fuse is correctly rated
for the wire size used. Refer to national/local codes for rating
and type. Normally, a minimum #16 AWG (1.31 mm2) wire
is required in order to use a 5-amp fuse.
Info: The green 8-port terminal block accepts CU/AL
conductors from #30 to #12 AWG (0.05 to 3.3 mm2).
2.5.1 Power Connections (Terminals 3 and 4)
1. Connect a wire (black) from the monitored battery bank’s
negative terminal to Terminal 4 on the 8-port terminal block.
2. Connect a wire (red) with a 5-amp in-line fuse from the
monitored battery bank’s positive terminal to Terminal 3 on the
8-port terminal block.
2.5.2 Generator Run Sense Connection (Terminal 2 and 4)
Terminal 2 on the 8-port terminal block is used as a generator
run sense (i.e., switched B+ or a positive battery signal from the
hour meter or gen running light). This run sense voltage is used to
determine that the generator is operating and to prevent another
starter crank while the generator is running.
Info: The run sense signal from the generator to Terminal 2
(positive) and Terminal 4 (negative) must be between 10-40
VDC and only while the generator is running.
3. Connect a wire (preferably not black or red) from the generator’s
run sense output to Terminal 2 on the 8-port terminal block.
4. Connect the negative terminal of the monitored battery bank to
Terminal 4 (power negative) on the 8-port terminal block. Ensure
the negative terminal on the generator battery is referenced/
connected to the negative terminal on the monitored battery.
Info: The negative side of the run sense signal from the
generator must be in common with the negative side of the
monitored battery bank. This ensures that the positive battery
voltage (to Terminal 3) and the positive run sense voltage (to
Terminal 2) have a common negative reference (to Terminal
4) and are correctly measured by the ME-AGS-S.

11 © 2016 Sensata Technologies
Installation
Figure 2-6, Generator Run Sense Options
Option 3 – Use an external 120 VAC coiled relay to bring the
generator’s battery voltage to the AGS run sense port (Terminal #2)
only while the generator is running. The generator’s battery voltage
must be 10-40 VDC.
Option 2 – Use a 120 VAC to 12 VDC step-down transformer
(normally used to charge power equipment batteries) and plug
into the generator’s 120 VAC output. The step-down transformer
provides 12 VDC output only while the generator is running.
Option 1 – Tap into the positive side of the generator’s hour meter
or running light; ensure the voltage is only 10-40 VDC while the
generator is running.
What if my generator does not have a run sense output? If your
generator is not equipped with a generator run sense output, review
Figure 2-6 for alternative options.
120VAC Coil Relay On Generator
NC
COM
NEUHOT
NO
120VAC Outlet
Inside Generator
Generator
Battery
run sense
AGSTerminal Block Ports:
1 2 3 4 5 67 8
DC Fuse
(5A max)
Generator
Battery
Inside Generator
Generator
Running Lamp
OR
Generator
Hour Meter
0123
negative
DC Fuse
(5A max)
run sense
AGSTerminal Block Ports:
1 2 3 4 5 67 8
negative
DC Fuse
(5A max)
run sense
AGSTerminal Block Ports:
1 2 3 4 5 67 8
On Generator
120VAC Outlet
120VAC IN
12VDC OUT
TRANSFORMER
negative

© 2016 Sensata Technologies 12
Installation
2.5.3 Gen Start/Stop Connections (Terminals 1, 5, 6, 7, & 8)
This section details the control relays inside the AGS controller
and provides information on wiring these relays to the generator’s
start/stop circuit. You must identify the generator’s start and stop
wiring requirements to determine how many relays you require, the
amount of wires you connect, and in what combination.
If the generator is equipped with a remote control terminal or
connector, the connections to the AGS control relays are made much
easier if the generator‘s optional remote control panel is purchased.
Connecting to the generator’s remote panel also eliminates the need
to make connections inside the generator.
The AGS controller provides three control relays (RY1, RY2, and
RY3) to operate the autostart/autostop functions of your generator.
These relays are dry contacts (provides no voltage or current) and
operate only as switches that turn low amperage devices on/off.
They are not intended to directly provide power to starter motors or
ignition systems. Rather, they are used to send a signal to operate
the coil of another higher amperage device, which does the actual
switching of power.
CAUTION: A fuse rated at 5 amps or less must be used to
protect each of the relays. The warranty does not cover
damage to these relays. Fuses should be located as close
as possible to the generator connection. A fuse must be
used even if the circuit is providing only a “dry contact” or
“ground” connection—it will prevent damage if the connection
is miswired or damaged.
Info: To set the generator type—which determines the
operation of the AGS relays—see “GEN TYPE Setting” in the
Setup section.
Info: Due to the different generator types and the various
starting/stopping wiring configurations used by generator
manufacturers, detailed wiring instructions are not provided
in this manual. Please refer back to your generator’s
documentation for wiring details.
Info: For more info and to view diagrams on connecting the
AGS to the start/stop circuit on many generators, refer to our
website at www.Magnum-Dimensions.com.
Depending on your generator’s start and stop wiring requirements,
you may only need to use one relay (RY1) for fully automatic two-
wire generators; two relays (RY1 & RY2) for 3-wire generators;
or all three relays (RY1, RY2, RY3) for generators that require an
independent bypass or preheat circuit.

13 © 2016 Sensata Technologies
Installation
Figure 2-7, Wiring to the AGS Controller’s Terminal Block
12 3 4 5 6 78
RY1
NC
COM
NONC
COM
NONC
COM
NO
Common (COM) contact on Relay 3 (RY3)
Normally Open (N.O.)
contact on Relay 3 (RY3)
Common (COM) contact on
Relay 1 (RY1) and Relay 2 (RY2)
Normally Open (N.O.)
contact on Relay 2 (RY2)
Normally Open (N.O.)
contact on Relay 1 (RY1)
8
7
6
Relays Inside the AGS controller
Positive DC voltage input [positive terminal from
monitored battery bank (9-64 VDC)]
Negative DC voltage input (negative/ground
terminal from monitored battery bank)
Positive run sense input
(10-40 VDC only when generator is running)
3
4
1
2
RY2 RY3
5
The connection points to each relay are as follows (see Figure 2-7):
2.6 Common ME-AGS-S Generator Wiring Diagrams
The most common generator starting/run/stop circuits can be
divided into three major types: two-wire, three-wire “momentary”,
or three-wire “maintain”. See Figures 2-9 through 2-12 for examples.
Info: The term “three-wire” refers to the minimum number
of wires required to control the starter motor and to run the
generator—more than three wires may actually be needed.

© 2016 Sensata Technologies 14
Installation
Figure 2-8, Warning Label
WARNING
ELECTRICAL SHOCK HAZARD
PN: 62-0002 Rev B
This electrical system is equipped with an Automatic Generator
Starting (AGS) device and/or an inverter. Disconnect all AC and
DC power to the AGS and/or inverter before performing any
service to the electrical system. Failure to do so can result in
shock causing serious injury or death.
2.7 Warning Label
It is unsafe to perform maintenance on the generator/electrical panel
if just the generator is turned off. The AGS system can automatically
turn on the generator and power the panel. See Figure 2-12.
The supplied warning label informs all that an automatic generator
starting device is installed in your electrical system. Place the label
in a clearly visible location at the generator (ensure it is visible
at the generator cabinet or at the enclosure that guards against
electrical shock or moving parts hazards).
WARNING: To protect servicing personnel, ensure the
generator and AGS are properly disabled (i.e., remove starting
battery from generator and remove all power to the AGS by
unplugging the AGS’s terminal block) prior to performing
maintenance on the generator or electrical panel.
The “two-wire” generator types (Figure 2-9) integrate the control
circuits for start-up, running and stopping. The generator starts and
runs when two “control” wires are connected, and stops when they
are disconnected.
The “three-wire momentary” generator types (Figures 2-10 & 2-12)
use a three-position momentary type switch that controls their
operation. To start the generator, the switch is momentarily held to
the START position. This energizes the ignition system and cranks
the starter motor. Once the engine has started, the START switch is
released and it returns to a center position (i.e., “momentary” run
control). To shut down the generator, the switch is held to the STOP
position until the engine dies. Once the switch is released, it returns
to the center position (i.e., “momentary” stop control).
The “three-wire maintain” generator types (Figure 2-11) use an
automotive type starting circuit. Operating a switch that is first
turned to a RUN position and then momentarily held to a START
position to start the generator. Once the engine has started, the
switch is released and it returns to the RUN position (i.e., “maintain”
run control). To shut down the generator, the switch is moved to the
OFF position (i.e., “maintain” stop control).