SMA SCHOOLMETERBOX User manual

System Monitoring
SCHOOLMETERBOX AU
Installation Guide
SMETER-IEN084710 | 98-00013210 | Version 1.0 EN

SMA Solar Technology AG Table of Contents
Installation Guide SMETER-IEN084710 3
Table of Contents
1 Notes on this Manual. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.1 Validity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.2 Target Group . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.3 Symbols Used . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.1 Appropriate Usage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2 Safety Precautions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3 Unpacking. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.1 Packing List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.2 Identifying the Schoolmeterbox . . . . . . . . . . . . . . . . . . . . . . . . . 7
4 Mounting the Device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4.1 Mounting Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4.2 Mounting the Schoolmeterbox on the Wall . . . . . . . . . . . . . . . . 8
4.3 Mounting the Schoolmeterbox onto a DIN Rail . . . . . . . . . . . . . 9
5 Electrical Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5.1 Connection Area Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5.2 Connecting the Schoolmeterbox to the RS485 Communication Bus 11
5.3 Terminating the RS485 Bus. . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.4 Connecting the Schoolmeterbox to the Consumption Meter . . 14
6 Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
6.1 Connecting the Schoolmeterbox to the Power Supply . . . . . . . 15
6.2 Detecting the Schoolmeterbox with the Sunny WebBox . . . . . 15
6.2.1 Adjusting the Schoolmeterbox Channels. . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
7 Maintenance and Care . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
7.1 Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Table of Contents SMA Solar Technology AG
4SMETER-IEN084710 Installation Guide
7.2 Care . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
8 Decommissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
8.1 Dismounting the Schoolmeterbox . . . . . . . . . . . . . . . . . . . . . . . 17
8.2 Packing the Schoolmeterbox. . . . . . . . . . . . . . . . . . . . . . . . . . . 17
8.3 Disposal of the Schoolmeterbox . . . . . . . . . . . . . . . . . . . . . . . . 17
9 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
9.1 LED Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
10 Channel List. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
10.1 Spot values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
10.2 Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
11 Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
12 Contact . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

SMA Solar Technology AG Notes on this Manual
Installation Guide SMETER-IEN084710 5
1 Notes on this Manual
This installation manual describes the mounting, electrical connection and commissioning of the
Schoolmeterbox. Store this manual where it will be accessible at all times.
1.1 Validity
This manual applies to Schoolmeterbox models with Hardware version A or later and Firmware
version 1.0 or later.
1.2 Target Group
This manual is intended for the installer.
1.3 Symbols Used
The following types of warnings and general information appear in this document as described
below.
DANGER!
DANGER indicates a hazardous situation which, if not avoided, will result in death or
serious injury.
WARNING!
WARNING indicates a hazardous situation which, if not avoided, could result in death or
serious injury.
CAUTION!
CAUTION indicates a hazardous situation which, if not avoided, could result in minor or
moderate injury.
NOTICE!
NOTICE indicates a situation that can result in property damage if not avoided.
Information
Information provides tips that are valuable for the optimal installation and operation of the
product.

Safety SMA Solar Technology AG
6 SMETER-IEN084710 Installation Guide
2 Safety
2.1 Appropriate Usage
The Schoolmeterbox retrieves counter pulses from the consumption meter and makes them available
to the Sunny WebBox from the SMA Solar Technology. The data are used to display the energy use
of the school. Communication takes places via RS485. The voltage is provided via a power supply
plug.
2.2 Safety Precautions
Please follow all operating and safety precautions in this manual. Failure to follow these instructions
could result in damage to the device and cause personal injury.
DANGER!
Risk of lethal electric shock when opening the inverter.
• Any work on the inverter must be carried out by qualified electricians only.
• Disconnect the inverter on the AC and DC sides as described in the inverter manual.
NOTICE!
The warranty becomes invalid if the Schoolmeterbox is opened or modified.
• The Schoolmeterbox may only be opened and modified by SMA Solar Technology.
In case of doubt, please contact us.

SMA Solar Technology AG Unpacking
Installation Guide SMETER-IEN084710 7
3 Unpacking
3.1 Packing List
Check the delivery for completeness and for any external damage. Please contact your dealer if you
find any damage or if the delivery is incomplete.
3.2 Identifying the Schoolmeterbox
Type plate
You can identify the Schoolmeterbox using the type plate on its underside.
Firmware and Hardware
The firmware and hardware versions of the Schoolmeterbox are shown on the Sunny WebBox user
interface as parameters.
A 1 Schoolmeterbox
B1Manual
C 1 RS485 cabling plan poster
D 1 Plug-in power supply with 4 adapters
E 3 Plug (2x 4-pin, 1x 2-pin)
F 1 Termination resistor
G 2 Conductive bonding sheets
H1Shield clamp
I 2 Wall anchors
J2Screws
K1Bracket
L 1 Fastener
M1 Screw

Mounting the Device SMA Solar Technology AG
8 SMETER-IEN084710 Installation Guide
4 Mounting the Device
4.1 Mounting Location
Observe the following surrounding conditions:
• The Schoolmeterbox is only suitable for indoor installation.
• The maximal cable length between the Schoolmeterbox and the consumption meter should not
exceed 0.5 m.
• The Schoolmeterbox power supply plug requires a socket.
• The maximal cable length of the RS485 bus cannot exceed 1,200 m.
• The Schoolmeterbox can be mounted horizontally or vertically.
4.2 Mounting the Schoolmeterbox on the Wall
Mounting accessories provided
1. Choose the mounting location as described in section 4.1„Mounting Location“ (8).
2. Check the minimum distances against the illustration and mark the position of the drill holes.
3. Drill the holes and attach the wall bracket to the wall using the anchors and screws.
A2Screws
B 2 Wall anchors
C1Bracket

SMA Solar Technology AG Mounting the Device
Installation Guide SMETER-IEN084710 9
4. Mount the Schoolmeterbox onto the bracket as shown in the illustration.
☑ The Schoolmeterbox has been mounted.
4.3 Mounting the Schoolmeterbox onto a DIN Rail
Mounting accessories provided
1. Choose the mounting location as described in section 4.1„Mounting Location“ (8).
2. Fix the clip onto the bracket with the screw, as shown in the illustration.
Turn the clip according to whether you want to mount the Schoolmeterbox vertically or
horizontally.
A1Bracket
B1Screw
C 1 Fastener

Mounting the Device SMA Solar Technology AG
10 SMETER-IEN084710 Installation Guide
3. Mount the bracket onto the DIN rail as shown in the illustration. The illustration shows a
horizontal mounting.
4. Mount the Schoolmeterbox onto the bracket as shown in the illustration.
☑ The Schoolmeterbox has been mounted.
5. How to remove the Schoolmeterbox from the bracket is shown in the illustration in section
8.1„Dismounting the Schoolmeterbox“ (17).

SMA Solar Technology AG Electrical Connection
Installation Guide SMETER-IEN084710 11
5 Electrical Connection
5.1 Connection Area Overview
5.2 Connecting the Schoolmeterbox to the RS485 Communication Bus
A Connection for the RS485 bus
B Power: connection for the power supply plug
C Ready: the "Ready" LED shows whether the device is being supplied with voltage.
D Pulse: the "Pulse" LED shows whether counter pulses are arriving at the device.
E S0: connection for the S0 interface
A Sunny WebBox
BInverter
C Schoolmeterbox
D Consumption Meter

Electrical Connection SMA Solar Technology AG
12 SMETER-IEN084710 Installation Guide
Preparing the cable
1. Remove 4 cm of the cable sheath.
2. Shorten the shield to 1.5 cm.
3. If the Schoolmeterbox is in the middle of the RS485 bus, carry out the following steps:
– Fold back the shielding and wrap it with
conductive adhesive foil. This is where the shield
clamp will be attached later.
4. Cut off unused wires at the cable sheath.
5. Strip approx. 6 mm off the wires.
Connecting the Cable to the Plug
6. Connect the leads to the four-pole plug.
7. Write down the colors of each wire.
8. Introduce the plug found in the Schoolmeterbox
into one of the terminals for the RS485 bus.
9. Connect the other end of the cable to the RS485
bus
See the RS485 cabling plan poster for the
connection layout and system wiring.
DANGER!
Risk of lethal electric shock when opening the inverter.
• Any work on the inverter must be carried out by qualified electricians only.
• Disconnect the inverter on the AC and DC sides as described in the inverter manual.
Notes on the RS485 cabling
See the RS485 cabling plan poster for information on cabling.
Signal Schoolmeterbox
RS485 bus connection
Wire colors RS485 bus
GND 5 5
Data + 2 2
Data- 7 7

SMA Solar Technology AG Electrical Connection
Installation Guide SMETER-IEN084710 13
Fasten the shield clamp
10. If the Schoolmeterbox is in the middle of the RS485 bus, carry out the following steps:
– Push the clamp onto the shieldings of both cables.
☑ The Schoolmeterbox is connected to the RS485 bus.
5.3 Terminating the RS485 Bus
Terminating the Schoolmeterbox
The Schoolmeterbox must only be terminated when it is
placed at the end of the RS485 bus.
1. Introduce the resistor included in the delivery in the
4-pole plug, in pins 2 and 7.
2. Introduce the plug in the free terminal for the
RS485 in the Schoolmeterbox.
☑ The Schoolmeterbox has been terminated.
Terminating the RS485 Communication Bus
See the RS485 cabling plan poster for the termination of the RS485 communication bus.

Electrical Connection SMA Solar Technology AG
14 SMETER-IEN084710 Installation Guide
5.4 Connecting the Schoolmeterbox to the Consumption Meter
Preparing the cable
1. Remove 4 cm of the cable sheath.
2. Cut off unused wires.
3. Strip approx. 6 mm off the wires.
Connecting the Cable to the Plug
4. Connect the leads to the two-pole plug.
5. Write down the colors of each wire.
6. Introduce the plug in the Schoolmeterbox into the
"S0" terminal.
7. Connect the other end of the cable to the
consumption meter.
☑ The Schoolmeterbox is connected to the
consumption meter.
Maximal Cable Length
The maximal cable length of 0.5 m should not be exceeded.
Schoolmeterbox
S0 Connection
Wire colors Consumption Meter Impulse
Output
+ + (e.g., +ve)
- - (e.g., -ve)

SMA Solar Technology AG Commissioning
Installation Guide SMETER-IEN084710 15
6 Commissioning
6.1 Connecting the Schoolmeterbox to the Power Supply
1. First, connect all devices on the RS485 bus.
2. Introduce plug connector of the power supply plug into the "Power" connection for it in the
Schoolmeterbox.
3. Introduce the power supply plug into an outlet socket.
☑ The "Ready" LED glows green, and the Schoolmeterbox has power. The Schoolmeterbox
starts. The start process takes about 20 seconds.
– If the LED does not glow, see section 9„Troubleshooting“ (18).
☑ The Schoolmeterbox is connected to the power supply. The Schoolmeterbox is ready to send
data to the Sunny WebBox.
6.2 Detecting the Schoolmeterbox with the Sunny WebBox
Now you can detect the Schoolmeterbox as a device with the Sunny WebBox, as described in the
Sunny WebBox manual.
6.2.1 Adjusting the Schoolmeterbox Channels
The Schoolmeterbox channels are adjusted via the Sunny WebBox web interface. To do this, follow
the Sunny WebBox manual. The following Schoolmeterbox channels are adjustable. The complete
channel list is described in section 10„Channel List“ (19).
Parameters
Channel Description
s_DevNam Here, you can enter a name for the Schoolmeterbox. The following
symbols can be used: A-Z, a-z, 0-9, _ , - , +, * , #, (space)
Unrecognized symbols will be replaced by a space.
*u_S0 Edge Here you can set whether the Schoolmeterbox should evaluate the
ascending or descending edge of the consumption meter signal.
*u_S0 Impuls/kWh You have to enter the number of consumption meter impulses per kWh
here.
u_S0 Offset You have to enter the consumption meter counter reading here. The
Schoolmeterbox counter reading has to be matched to that of the
consumption meter, so that the Schoolmeterbox has the same initial
reading. You must enter the counter reading times one hundred (for
example, to get 10.25 kWh, you have to enter 1025)
*This channel is only visible if you are logged in at the Sunny WebBox as "Installer". To do this,
follow the Sunny WebBox manual.

Maintenance and Care SMA Solar Technology AG
16 SMETER-IEN084710 Installation Guide
7 Maintenance and Care
7.1 Maintenance
Conduct regular visual inspections of the Schoolmeterbox to check for external damage or dirt.
7.2 Care
NOTICE!
Damage to the device due to infiltration of liquids.
The Schoolmeterbox is not impermeable, liquids should not be allowed to infiltrate.
• To clean the device, use only a lightly dampened cloth so as to prevent the ingress
of liquids. If there is a considerable amount of dirt, you can also use a mild, non-
abrasive and non-corrosive cleaning agent.

SMA Solar Technology AG Decommissioning
Installation Guide SMETER-IEN084710 17
8 Decommissioning
8.1 Dismounting the Schoolmeterbox
1. Steady the Schoolmeterbox and remove all plug connectors.
2. Remove the Schoolmeterbox from the bracket as shown in the illustration.
3. Dismount the bracket.
4. Remove the wires from the plugs.
5. Remove the cable connections to other devices at the devices as described in the respective
manuals of each device.
6. If the Schoolmeterbox was at the end of a RS485 bus, terminate the device which is now at the
end of the RS485 bus instead of the Schoolmeterbox.
☑ The Schoolmeterbox has been decommissioned.
8.2 Packing the Schoolmeterbox
When returning the device to us, be sure to use packaging which adequately protects the device from
damage during transport and, if possible, use the original packaging.
8.3 Disposal of the Schoolmeterbox
Dispose of the Schoolmeterbox at the end of its service life in accordance with current disposal
regulations for electronic waste that apply at the installation site. Alternatively, send it back to SMA
Solar Technology with shipping paid by sender and labeled "FOR DISPOSAL."

Troubleshooting SMA Solar Technology AG
18 SMETER-IEN084710 Installation Guide
9 Troubleshooting
9.1 LED Overview
Ready-LED (green)
Status Meaning Measure
permanently on Voltage is ok None
flashes Communication is taking place at present via the
RS485 bus.
None
permanently off There is no voltage, or the voltage is too low. Check the supply
voltage and the power
supply plug.
Pulsating-LED (yellow)
Status Meaning Measure
flashes Normal operation
Counter impulses from the consumption meter are
arriving.
None
permanently off Counter impulses from the consumption meter are
not arriving presently.
-or-
There is no power consumption by the school at
present.
Check the wiring
None
permanently on There is a short-cirtuit of the S0 interface.
-or-
There is no power consumption by the school at
present.
Check the wiring
None

SMA Solar Technology AG Channel List
Installation Guide SMETER-IEN084710 19
10 Channel List
10.1 Spot values
Spot values can only be read and not changed.
10.2 Parameters
Spot values
Channel Description
m_OpTM Shows the number of hours in operation which the Schoolmeterbox has run
since commissioning.
m_Pac Shows the computed spot value for the power output.
m_ResetCount Shows the number of resets (restarts) of the Schoolmeterbox.
m_S0 Count Shows the number of consumption meter impulses.
m_S0 kWh Shows the power consumption in kWh.
Parameters
Channel Description
s_DevNam Here, you can enter a name for the Schoolmeterbox. The following
symbols can be used: A-Z, a-z, 0-9, _ , - , +, * , #, (space)
Unrecognized symbols will be replaced by a space.
*s_DevRs With this channel, you can carry out a reset (restart) of the
Schoolmeterbox. The value of this channel is always "0". To carry out a
reset, enter the value "1" and save it. At this moment the Schoolmeterbox
carries out a reset. The value for the channel is set back to "0".
s_FwVer Shows the firmware version of the Schoolmeterbox.
s_HwVer Shows the hardware version of the Schoolmeterbox.
s_SN Shows the serial number of the Schoolmeterbox.
*u_S0 Edge Here you can set whether the Schoolmeterbox should evaluate the
ascending or descending edge of the consumption meter signal.
*u_S0 Impuls/kWh You have to enter the number of consumption meter impulses per kWh
here.
u_S0 Offset You have to enter the consumption meter counter reading here. The
Schoolmeterbox counter reading has to be matched to that of the
consumption meter, so that the Schoolmeterbox has the same initial
reading. You must enter the counter reading times one hundred (for
example, to get 10.25 kWh, you have to enter 1025)
*This channel is only visible if you are logged in at the Sunny WebBox as "installer". To do this,
follow the Sunny WebBox manual.

Technical Data SMA Solar Technology AG
20 SMETER-IEN084710 Installation Guide
11 Technical Data
Communication
Data logger communication RS485 to Sunny WebBox
Connections
Sunny WebBox and Inverterspring-type terminal
Consumption Meter spring-type terminal
Max. Communication Range
RS485 1,200 m
Power Supply
Power Supply Plug-in power supply
Input voltage 12 V to 24 V DC ±10% / 50 Hz to 60 Hz
Power consumption typically 1 W
Environmental conditions for operation
Ambient temperature -20 °C to +65 °C
Relative humidity 5 % to 95 %, non-condensing
Enclosure Rating IP20
Elevation 0 m to 2000 m above mean sea level (AMSL)
Ambient conditions during storage/ transport
Ambient temperature -40 °C to +70 °C
Relative humidity 10 % to 95 %, non-condensing
Elevation 0 m to 3000 m above mean sea level (AMSL), at
least 70kPa
General data
Dimensions (W/H/D) in mm 102/30/54
Weight approx. 80 g
Mounting Location indoor
Applicability Top hat rail, wall bracket
Status display LEDs
Features
Operation through the Sunny WebBox interface
Warranty 5 years
Certificates and approvals www.SMA.de