Maretron ACM100 User manual

Revision 1.3 Page i
ACM100
Alternating Current Monitor
User’s Manual
Revision 1.3

ACM100 User’s Manual
Page ii Revision 1.3
Revision History
Revision
Description
1.0
Original document
1.1
Corrected AC sensor part number
Updated mounting drawing
1.2
Added sensed voltage and current range specifications
Added prohibition of red Loctite threadlocking compound and cleaning agents
containing acetone
1.3
Updated maximum voltage specifications
Added description of connection to three-phase delta circuits
Updated list of devices/programs that can be used for configuration
Updated transmission intervals of transmitted messages
Typographical corrections
Expanded PGN entries in Appendix A
Removed obsolete device priority subsection in configuration section
Added mechanical drawings for current transducer accessories

Revision 1.3 Page iii
Table of Contents
1Introduction ...........................................................................................................................1
1.1 Firmware Revision.................................................................................................... 1
1.2 ACM100 Features .................................................................................................... 1
1.3 ACM100 Accessories............................................................................................... 2
1.4 Quick Install.............................................................................................................. 2
2Installation.............................................................................................................................2
2.1 Unpacking the Box ................................................................................................... 2
2.2 Choosing a Mounting Location................................................................................. 2
2.3 Mounting the ACM100.............................................................................................. 2
2.4 Connecting the ACM100 .......................................................................................... 3
2.4.1 NMEA 2000®Connection............................................................................... 3
2.4.2 AC Sensor Connections ................................................................................ 4
2.4.2.1 Single-Phase (Phase A) Connection................................................ 5
2.4.2.2 Single-Phase (Phase A, B) Connection ........................................... 6
2.4.2.3 Three-Phase Wye (Phase A, B, C) Connection ............................... 8
2.4.2.4 Three-Phase Delta (Phase A, B, C) Connection............................ 10
2.4.3 Checking Connections................................................................................. 12
2.5 Configuring the ACM100........................................................................................ 12
2.5.1 Advanced Configuration…........................................................................... 12
2.5.1.1 Current Transducer A..................................................................... 12
2.5.1.2 Current Transducer B..................................................................... 13
2.5.1.3 Current Transducer C .................................................................... 13
2.5.1.4 Power Damping Period.................................................................. 13
2.5.1.5 V,I,F Damping Period..................................................................... 13
2.5.1.6 Installation Description................................................................... 13
2.5.1.7 NMEA 2000®PGN Enable/Disable................................................ 13
2.5.1.8 Restore Factory Defaults ............................................................... 14
2.5.2 AC Circuit Type............................................................................................ 14
2.5.3 AC Device Type........................................................................................... 14
2.5.4 Device Instance........................................................................................... 14
2.5.5 Label............................................................................................................ 14
2.5.6 Reset Total Energy Recorded...................................................................... 14
3Output Parameters..............................................................................................................15
3.1 Line-Specific and Line-to-Neutral Measurements................................................... 15
3.2 Line-to-Line Measurements.................................................................................... 15
4Maintenance........................................................................................................................16
5Troubleshooting ..................................................................................................................16
6Technical Specifications......................................................................................................17
7Technical Support ...............................................................................................................18
8Installation Template...........................................................................................................19
9Accessories Mechanical Drawings......................................................................................20
10 Maretron (2 Year) Limited Warranty....................................................................................22

ACM100 User’s Manual
Page iv Revision 1.3
Table of Figures
Figure 1 –Mounting the ACM100.............................................................................................. 3
Figure 2 –NMEA 2000®Connector Face Views ....................................................................... 4
Figure 3 –Single-Phase (Single Line) Connection Diagram...................................................... 5
Figure 4 –Single-Phase (Dual Line) Connection Diagram........................................................ 6
Figure 5 –Three-Phase Wye Connection Diagram................................................................... 8
Figure 6 –Three-Phase Delta Connection Diagram................................................................ 10
Figure 7 –Mounting Surface Template ................................................................................... 19
Figure 8 –M000530 100A Current Transducer....................................................................... 20
Figure 9 –M000612 400A Current Transducer....................................................................... 21
Table of Appendices
Appendix A –NMEA 2000®Interfacing.................................................................................... A1

Revision 1.3 Page 1
1 Introduction
Congratulations on your purchase of the Maretron Alternating Current (AC) Monitor (ACM100).
Maretron has designed and built your ACM100 to the highest standards for years of dependable
and accurate service.
Maretron’s ACM100 is a device which monitors AC power sources and outputs information about
these sources onto the industry standard NMEA 2000® marine data network. ACM100 output
information is then displayed with networked NMEA 2000®equipment such as the Maretron
DSM150/DSM250 dedicated display or with NMEA 2000®compatible software such as Maretron
N2KView. The ACM100 can sense voltages up to 380VAC (line-to-neutral) and currents up to
400A.
The Maretron ACM100 is designed to operate within the harsh demands of the marine
environment. However, no piece of marine electronic equipment can function properly unless
installed, configured, and maintained in the correct manner. Please read carefully and follow
these instructions for installation, configuration, and usage of the Maretron ACM100 in order to
ensure optimal performance.
1.1 Firmware Revision
This manual corresponds to ACM100 firmware revision 1.0.9.2.
1.2 ACM100 Features
The Maretron ACM100 has the following features.
NMEA 2000®Interface
Waterproof Connectors
Sealed Waterproof Enclosure
Opto-Isolated from NMEA 2000®Eliminating Potential Ground Loops
Monitoring of busses carrying AC power and transmitting
oVoltage
oFrequency
Monitoring AC Power Sources such as Utilities and Generators and transmitting:
oVoltage
oCurrent
oFrequency
oReal Power
oReactive Power
oApparent Power
oPower Factor
oTotal Energy Imported
oTotal Energy Exported
Can be used in the following configurations
o120VAC single phase
o120/240VAC split-phase
o230VAC single phase

ACM100 User’s Manual
Page 2 Revision 1.3
oThree-phase Wye (4-wire) up to (380/658Y)
oThree-phase Delta (3-wire) up to 660V
1.3 ACM100 Accessories
Maretron offers the following accessories for the ACM100 (please refer to Section ? for
dimensions):
M000630 100 Amp AC transducer with cable
M000612 400 Amp AC transducer with cable
1.4 Quick Install
Installing the Maretron ACM100 involves the following five steps. Please refer to the individual
sections for additional details.
1. Unpack the box (Section 2.1)
2. Choose a mounting location (Section 2.2)
3. Mount the ACM100 (Section 2.3)
4. Connect the ACM100 (Section 2.4)
5. Configure the ACM100 (Section 2.5)
2 Installation
2.1 Unpacking the Box
When unpacking the box containing the Maretron ACM100, you should find the following items:
1 –ACM100 –AC Monitor
1 –100A AC Current Transducer with 5 ft. (1.5m) long cable (Part # M000630)
1 –Parts Bag containing 4 Stainless Steel Mounting Screws
1 –ACM100 User’s Manual
1 –Warranty Registration Card
If any of these items are missing or damaged, please contact Maretron.
2.2 Choosing a Mounting Location
Please consider the following when choosing a mounting location.
1. The ACM100 is waterproof, so it can be mounted in a damp or dry location.
2. The orientation is not important, so the ACM100 can be mounted on a horizontal deck,
vertical bulkhead, or upside down if desired.
3. The ACM100 is temperature rated to 55°C (130°F), so it should be mounted away from
engines or engine rooms where the operating temperature exceeds the specified limit.
2.3 Mounting the ACM100
Attach the ACM100 securely to the vessel using the included stainless steel mounting screws
or other fasteners as shown in Figure 1 below. Do not use threadlocking compounds containing

Revision 1.3 Page 3
methacrylate ester, such as Loctite Red (271), as they will cause stress cracking of the plastic
enclosure.
Figure 1 –Mounting the ACM100
2.4 Connecting the ACM100
The ACM100 requires two types of electrical connections: 1) the NMEA 2000®connection
(refer to Section 2.4.1), and 2) the AC sensor connections (i.e., current transducer(s) and
sensing voltage(s) connections), which are described in Section 2.4.2.
2.4.1 NMEA 2000®Connection
The NMEA 2000®connector can be found on the side of the enclosure. The NMEA 2000®
connector is a round five pin male connector (see Figure 2). You connect the ACM100 to an
NMEA 2000®network using a Maretron NMEA 2000®cable (or compatible cable) by connecting
the female end of the cable to the ACM100 (note the key on the male connector and keyway on
the female connector). Be sure the cable is connected securely and that the collar on the cable
connector is tightened firmly. Connect the other end of the cable (male) to the NMEA 2000®
network in the same manner. The ACM100 is designed such that you can plug or unplug it from
an NMEA 2000®network while the power to the network is connected or disconnected. Please
follow recommended practices for installing NMEA 2000®network products.

ACM100 User’s Manual
Page 4 Revision 1.3
Figure 2 –NMEA 2000®Connector Face Views
2.4.2 AC Sensor Connections
The ACM100 sensor connections are made by connecting to the 12-pin terminal strip on the top
of the unit. First, remove the four screws at the corners of the unit detaching the splash guard
from the unit. On the bottom of the splash guard, you will find a label detailing the wire connection
to pin number assignments, which are repeated in the table below.
Pin #
Signal Name
Connection
1
VALine
Voltage Phase A Line
2
VBLine
Voltage Phase B Line
3
VCLine
Voltage Phase C Line
4
VANeutral
Voltage Phase A Neutral
5
VBNeutral
Voltage Phase B Neutral
6
VCNeutral
Voltage Phase C Neutral
7
IA+
Current Phase A Plus
8
IA-
Current Phase A Minus
9
IB+
Current Phase B Plus
10
IB-
Current Phase B Minus
11
IC+
Current Phase C Plus
12
IC-
Current Phase C Minus
WARNING: The voltages present on AC circuits can cause electrocution.
Before making any electrical connections to the ACM100, ensure that power is
removed from all AC circuits that will be connected to theACM100. Only restore
AC power after all connections have been made to the ACM100 and the splash
guard has been re-installed.

Revision 1.3 Page 5
WARNING: If the supplied current transducer is placed around a wire carrying
AC current, then extremely high voltages can develop on the output leads of
the current transducer, with severe risk of electrocution. For safety, keep the
output leads of the current transducer(s) shorted or tied together until they are
connected to the proper terminals on the ACM100.
WARNING: User supplied voltage sense cables must be 18 gauge or larger,
have insulation rated to 600V, and must have the conductor connected to the
hot lead of the AC power source protected by a fuse rated at 3A or less (the
current consumed by the voltage sense circuit on the ACM100 is negligible, at
less than 10mA).
Before attempting to connect the ACM100 to the AC source, determine the type of system you
will be monitoring. The ACM100 supports the connection and monitoring of four different system
types; 1) single-phase single line system (Section 2.4.2.1), 2) single-phase dual line system
(Section 2.4.2.2), 3) three-phase wye connected system (Section 2.4.2.3), or 4) three-phase
delta connected system (Section 2.4.2.4).
2.4.2.1 Single-Phase (Phase A) Connection
Please refer to Figure 3 for connecting the ACM100 to a single phase, single line system.
Figure 3 –Single-Phase (Single Line) Connection Diagram
Use the following instructions when you are connecting the ACM100 to a single-phase circuit
connected via one (hot) phase wire and one neutral wire. You will need to install one current
transducer and one voltage sense cable.
Step 1: De-energize the AC Source.
Line (Phase A)
Neutral
U.S.
120 Volts
60Hz
+
-
Europe
220 Volts
50Hz
+
-
AC Source
1
2
5
4
3
6
7
8
9
10
11
12
Fuse
VALine
VANeutral
Current
Transducer
ACM100 Screw Terminals
VBLine
VCLine
VBNeutral
VCNeutral
IA+
IA-
IB+
IB-
IC+
IC-

ACM100 User’s Manual
Page 6 Revision 1.3
Step 2: The Current Transducer has black and white wires. Install the Current Transducer as
follows:
a. Connect the black wire to pin 7 (IA+) on the ACM100
b. Connect the white wire to pin 8 (IA-) on the ACM100
c. Disconnect the hot wire from the AC power source and place it through the hole in the
Current Transducer such that the arrow on the Current Transducer points towards the
AC power source. Then, reattach the hot wire to the AC source.
Step 3: You must supply a cable for connecting the voltage sense pins on the ACM100 to the
AC source. For the purposes of these instructions, we will assume that the cable has one black
conductor and one white conductor. Install the voltage sense cable as follows:
a. Connect the white wire from one end of the Voltage Sense cable to pin 4 (VANeutral) on
the ACM100.
b. Connect the white wire from the other end of the Voltage Sense cable to the neutral
wire of the AC source being monitored.
c. Connect the black wire from one end of the Voltage Sense cable to pin 1 (VALine) on
the ACM100
d. Connect the black wire from the other end of the Voltage Sense cable to a fuse
appropriately sized for the black wire (18 gauge wire minimum and 3 amp fuse or
less).
e. Connect the other end of the fuse to the AC source hot wire (the fuse should be placed
within 6 inches of the connection to the hot wire).
2.4.2.2 Single-Phase (Phase A, B) Connection
Please refer to Figure 4 for connecting the ACM100 to a single phase, dual line system.
Figure 4 –Single-Phase (Dual Line) Connection Diagram
VALine
VANeutral
VBLine
VCLine
VBNeutral
VCNeutral
IA+
IA-
IB+
IB-
IC+
IC-
Line (Phase A)
Neutral
U.S.
120 Volts
60Hz
+
-
Europe
220 Volts
50Hz
+
-
AC Source
1
2
5
4
3
6
7
8
9
10
11
12
Fuse
Current
Transducer
ACM100 Screw Terminals
Fuse
Line (Phase B)
Current
Transducer