wattwatchers A6M+One User manual

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A6M+One
Installation Guide
Three-phase - Transformer-coupled
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Version: 1.3
Issue Date: 10 May 2019
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About the A6M+One
The Wattwatchers A6M+One billing solution provides NMI-certified billing data for
applications such as solar PPAs, EV charger disaggregation, embedded networks,
and microgrids, with an additional 6 circuits of performance monitoring capability.
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The A6M+One delivers real-time monitoring, NMI- compliant billing and
circuit-switching capability in a neat, DIN-rail mounted package:
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➔Two real-time, three-phase monitoring points (using the Auditor 6M)
➔One NMI-compliant billing channel using the PMC-340B-B (this is the ‘One’)
➔Two independent switching channels which can be used to control contactors
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Wattwatchers Pty Ltd - ABN 47 123 010 588 May 2019 Page 1 of 6

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Contents
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1. Before you begin
2. Install the PMC-340B-B
3. Install the Auditor 6M+One device
4. Connect the Modbus cable
5. Connect the switching outputs (if used)
6. Use the onboarding tool
7. Validate installation
Help and support?
Need help with your installation? Lodge a support ticket via
www.wattwatchers.com.au/support or email [email protected]
●Use the onboarding tool to check the installation while the installer is on site
●Please make sure the metadata (circuit details) are complete
●Please quote one serial number per support request
Our team is available for urgent matters from 0900 to 1700, Monday to Friday,
Sydney time on 02 8316 7540 ([phone] from overseas)
Document Revision
Version
Author
Date
Changes
1.0
Jon Keeble
Dec 2018
Initial release
1.1
James Clements
Jan 2019
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1.3
Jon Keeble
7 May 19
CT install and de-install
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1. Before you begin
Ideally, a site survey will have been conducted that identifies:
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➔The space required to fit the two meters and any contactors
➔The dimensions of the cables or bus bars to be monitored
➔The current ratings of the cables and bus bars to be monitored
➔The need for accessories like external enclosures and high-gain antennas
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Ensure you have the recommended equipment:
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➔Internet-connected smart device (e.g. smartphone, tablet, laptop)
➔a login to onboarding.wattwatchers.com.au for configuration/validation
➔a marker for numbering Current Transformers and cables during installation
➔a hand-held clamp/multi-meter for checking current measurements
➔An additional DIN-rail enclosure (in case there is no room on the existing rail)
➔A spare three-phase breaker (10A or 16A) where an existing breaker is not
available
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Auditor 6M+One hardware checklist (box contents):
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➔Modbus-enabled A6M+One device
➔Wiring tail—three phase
➔PMC-340B-B three-phase transformer-coupled billing meter
➔Billing CTs (typically 600A/5A to suit the circuit and cables or bus-bars)
➔Monitoring CTs + green CT connector (where the A6M+One is for monitoring)
➔Modbus cable
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Check that:
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➔9U (157.5mm) is available on the DIN rail for the A6M+One with
PMC-340B-B35XAE
➔The circuit cables fit through the CT openings
➔There is space for the contactors if you are using the switching functions
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Wattwatchers Pty Ltd - ABN 47 123 010 588 May 2019 Page 2 of 6

2. Install the PMC-340B-B
The PMC-340B-B is a National Measurement Institute (NMI) pattern-approved,
non-communicating, three-phase billing meter 5 DIN rail units wide (126mm).
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PMC-340B-B LCD and Buttons
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The PMC-340 front panel and display can be used as directed in the PMC-340 User
Manual. Do not change the Modbus communications parameters. The PMC-340 is
shipped with the front panel password set to the default 000.
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PMC-340B-B Billing CTs
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The billing CTs provided with the PMC-340B are labeled 600A/5A, and are
incompatible with the Auditor 6M. Likewise, the Auditor CTs (labeled 100mA) must
only be used with the A6M
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PMC-340B-B CT Installation
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Connect the billing CTs and phase voltages to the PMC-340B as per the diagrams
and table below, according to whether two phases or three phases are present.
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2Phase, 3Wire, 2CTs 3Phase, 4Wire, 3 CTs
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Connect the PMC-340B as summarised below for three-phase
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CT Connections
PMC-340B-B
Phase A (L1)
L1 to L1’
Phase B (L2)
L2 to L2’
Phase C (L3)
L3 to L3’
Common connection
L1’ to L2’ to L3’ to Neutral
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Voltage Connections
PMC-340B-B
Phase A (L1)
Terminal 1
Phase B (L2)
Terminal 2
Phase C (L3)
Terminal 3
Neutral
Terminal 4
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The PMC-340B-B Modbus settings are preconfigured, and must not be changed.
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Modbus Device ID
100
Baud Rate
9600
Serial Configuration
8E1
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Wattwatchers Pty Ltd - ABN 47 123 010 588 May 2019 Page 3 of 6

3. Auditor 6M Installation
Three-Phase Voltage Connections
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➔The voltage connections are labeled on the Auditor: P1, P2, P3, N.
➔Connect voltage phases to P1, P2, and P3. Connect neutral to N.
➔Use three-phase wiring tails if they were provided with your Auditor. 
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Current Transformers
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➔Only Wattwatchers-supplied CTs are supported
➔CTs of different size can be interchanged in the field in sets of three
eg. channels 1-3, 60 Amps; channels 4-6, 400 Amps
➔CT size must be updated using the onboarding tool
➔Directional arrows for CT placement are imprinted on the CTs.
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CT sizes and opening aperture widths
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Size ( amps)
Opening Width (mm)
60
10
120
16
200
22
400
25
600
36
Current Transformer Connections
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➔The CT connections are labeled: ≡, 6+, 5+, 4+, ≡, 3+, 2+, 1+
➔The white wires connect to terminals labeled “≡” (three wires in each
terminal)
➔The pink wires connect to the terminals labeled “+”
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Current Transformer Orientation
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➔For grid monitoring: the arrow is from the grid
➔For solar monitoring: the arrow is from the inverter
➔For load monitoring: the arrow is towards the load
➔CTs must be installed on the correct phase
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Place CT connected to ...
On cables connected to ...
1+ and 4+
P1
2+ and 5+
P2
3+ and 6+
P3
It is acceptable to use less than six CTs.
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Wattwatchers Pty Ltd - ABN 47 123 010 588 May 2019 Page 4 of 6

4. Connect the Modbus cable
Install the Modbus cable to the PMC-340B-B and the A6M. A two-core,
double-insulated cable is supplied, to be cut to the required length.
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One end of the cable is stripped and connects to screw terminals on the PMC-340B.
These connections must be torqued to 0.45 Nm. The other end is terminated in a
three-pin Terminal Block connector at the A6M+One.
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PMC-340B-B
Auditor6M
Screw terminal 11
Terminal A-
Screw terminal 12
Terminal B+
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5. Connect the switching outputs
(Skip if you are not using switching)
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➔The two switching outputs are labeled 1 and 2.
➔The common power for all three switches is labeled △.
➔Connect P1 to △ in order to power the switches.
➔Connect each switch output you require to a contactor and terminate the
contactor coil on neutral.
➔For single-phase contactors, the contactors can be wired Normally Closed
(NC) by using R1 and R2 or Normally Open (NO) by using 1 and 2.
➔For three-phase contactors, the contactors can only be NC. 
➔Implement a CT to monitor each circuit that is switched.
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6. Use the onboarding tool
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The onboarding tool onboarding.wattwatchers.com.au is used by the installer to
record details of the installation and check that the installation is correct.
●The login credentials are provided by your Wattwatchers representative.
●Auditor data updates at 5 seconds, the PMC340 data at 5 minutes.
●The power factor is a very useful indicator that the CTs are installed on the
correct phase and in the correct orientation: does the reported PF match
the expected PF.
●The expected PF varies with what is being measured.
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Wattwatchers Pty Ltd - ABN 47 123 010 588 May 2019 Page 5 of 6

7. Validate installation
Three green solid indicators identify the connection status. When the installation is
completed successfully, all three green lights on the front of the Auditor will be on.
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L1
L2
L3
Explanation
Off
Off
Off
Powered off
Blinking
Off
Off
Powering on
Solid
Off
Off
Powered on – connecting to mobile network
Solid
Blinking
Off
Searching for SIM
Solid
Solid
Off
SIM found
Solid
Solid
Blinking
Waiting for servers
Solid
Solid
Solid
Connection complete
Auditor Switch and Modbus Indicators
If...
Indicator is...
Then the...
S1
Off
Red
Blue
The feature is not enabled
Switch is OFF
Switch is ON
S2
Off
Red
Blue
The feature is not enabled
Switch is OFF
Switch is ON
MB
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Red (blinks every 5 seconds)
Green (blinks off every 5 minutes)
PMC-340 not detected
PMC-340 is detected
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Validating that your installation is correct
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If...
Then...
Otherwise...
Circuit current rating is
less than the CT rating.
The correct size CTs
are installed.
Use a larger CT.
Install data shows three
voltages around 240V,
less than 265V.
The voltage
connections are
good.
Check the voltage
connections to P1, P2, P3
are three phases.
Three-phase solar
inverter circuits that have
equal current and PF=1.
Solar CTs are
installed correctly.
Check CT wiring, phase and
orientation.
With the solar inverter
turned off, PF is +ve and
expected value on all
circuits.
Grid and load CTs
are installed
correctly.
Ensure the CT phase and
orientation is correct. CTs
on the wrong phase may
cause negative PF
readings. Where there is
solar operating, Grid
circuits show -ve PF if
there is “feed-in”.
Current measured with
tongs meters matches
the reported.
The Auditor is
configured correctly.
Use onboarding tools to
change the CT to the
correct size.
Default phase allocation
is ok for this installation.
Multiple single-phase
loads are being
monitored.
Email Support with pairing
channel and phase e.g.
CH1/P1.
A CT is used to monitor
one of multiple parallel
conductors for a
connection
Email Support with
pairing channel,
phase and CT size
e.g. CT1/P1 400A.
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Wattwatchers Pty Ltd - ABN 47 123 010 588 May 2019 Page 6 of 6