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Monitoring systems
System monitoring using Transclinic xi+
System for a permanent performance control of photovoltaic plants
The unlimited functionality of a photovoltaic plant is crucial for its efficiency.
The Transclinic xi+ device series continuously calculates/determines the
current coming from individual strings or string groups as well as the voltage
in a photovoltaic plant thus allowing a very detailed monitoring. Disturbances
that might cause a decrease in profits are thus identified and can be
eliminated without delay.
Depending on the model, the Transclinic xi+ has between 4 and 14 inputs
for measuring currents of up to 30 A per string. The current measuring is
particularly reliable thanks to very linear and stable shunt resistances. The
current and voltage measuring data are transmitted via ModBus RTU over
EIA RS-485. Evaluation and presentation of the data can be done using the
PV Plant software (pages 34 to 35).
In addition to current and voltage, it is possible to control optional analogue
and digital signals and to operate signalling devices via a digital output.
The information obtained about the operational status provides a reliable
monitoring mechanism for the photovoltaic facility, which will help you to
optimise your yield.
Current measurement
The measuring of the string current is
effected via precise shunt resistances
in order to achieve high linearity.
Digital output
This digital output can be operated
remotely. Thus, for instance, it is
possible to operate signal units in
case of maintenance.
28
Monitoring systems
Voltage measurement
Transclinic xi+ enables voltage measurements
up to 1,000 V DC. In combination with the
string currents, this allows the calculation of
the generated output of a photovoltaic plant.
+70 °C
to
–20 °C
Temperature monitoring
Transclinic xi+ is suitable for a large range
of temperatures thus allowing a safe
operation in the combiner boxes. In addition
to this it determines the current temperature
of the PCB.
Analogue and digital inputs
In addition to the analogue values of voltage, current and PCB
temperature it is possible to utilise further analogue and digital
signals. So, for instance, it is possible to monitor the status of
the surge protection or to connect wind and irradiance sensors.
29
Monitoring systems
Transclinic xi+ – permanent performance monitoring
Supplemented with the PV Plant software program which has a
module to manage the data and one to visualise it online or
off-line, which offers several ways to access the operating data
of the photovoltaic facility. The information about the operating
condition of a photovoltaic plant is a crucial factor in yield
optimisation.
The aim of the monitoring function is to provide permanent
monitoring of the system to allow timely action to be taken as
soon as the processes are not working as desired. Using the
Transclinic xi+ monitoring system Weidmüller has created a
solution specially designed for photovoltaic systems that
provides permanent performance monitoring.
Transclinic xi+
INVERTER
+
+
+
–
–
Transclinic xi+ circuit diagram
30
g
Power Supply 18...36 VDC
Analoge input
Analoge input
Digital input
Digital output
X5
X8
X4
Modbus
g
SW2
IN2–
IN2+
IN1–
IN1+
GND
IIN
VIN
GND
IIN
SW1
VIN
0V
X6
24 V
Modbus RS485 RTU
X7
GND
485
X3
485–
X1
485+
485+
S1
S2
X4
S3
S4
Input DC–
S5
S6
S7
S8
X1
GND
485
PV PANEL
485–
Output DC–
Modbus RS485 RTU
TRANSCLINIC XI+
X2
Monitoring systems
Full functionality of a photovoltaic system is critical in terms of its
efficiency. In particular, the decreasing feed-in tariffs mean that it
is highly important for the operators and investors that the
system is functioning perfectly. As photovoltaic panels are
connected in series in so-called strings, local incidents can often
have wide reaching effects, either on the whole string or even on
whole segments of strings which are connected together.
Performance reductions
There are many possible influences that can be considered
when thinking about the possible causes of performance
reductions:
• Shadowing
- Plants that grow over time
-E
rrors during the layout of the system thanks to the shadow
cast from known obstacles (e.g. trees and parts of buildings)
- Newly constructed buildings
• Dirt / pollution
- Plant pollen
- Soot
- Moss
- Bird droppings
• Decreasing panel properties
- Resistance increase at solder points
- Cell breakage
- Impaired performance of diodes in junction boxes
• Installation errors
-P
oorly fitted or missing cable lines / plug-in connectors
• Other errors
- Cable damage (e. g. animal bite)
- Interference by unauthorised persons (e. g. theft)
Depending on the effects of the cause, the yield of the plant may
decrease by more than 10% compared to when there is errorfree operation. To prevent such losses in yield, Weidmüller offers
an efficient monitoring solution with Transclinic xi+.
The series continuously monitors the power from single strings
or groups of strings as well as the voltage of a Photovoltaic
system and thereby permits detailed monitoring of the system.
Negative influences, which lead to reduced output, can be
detected immediately allowing rapid repairs or adjustments to
be made directly to the system.
Continuous string monitoring
The Transclinic xi+ devices are divided into a measuring PCB
and a CPU PCB for data processing. With this set-up and
depending on the model, it is possible to measure the values
from between 4 and 14 strings, with a maximum current per
string of 30 A. By detecting the performance in parallel of many
strings, and deviations detected can be narrowed down to the
affected string and its modules. The effort involved in fault
elimination is therefore directly reduced. For comparative
measurements of the modules in the affective strings, the
Weidmüller analysis system CLINICS SOLAR can be used.
Using it, any performance reducing panel can be easily
detected, even when they appear normally externally.
Connecting additional devices
The currents and voltages measured by the Transclinic xi+ are
digitised on the CPU PCV and transmitted via an RS 485
interface using the MODBUS RTU protocol. Additionally, other
freely selectable analogue and digital signals can be controlled
and signalling devices operated via a digital output. This permits
the surge protection to be monitored. This allows targeted,
proactive planning of maintenance work, as it can be directly
determined which spare parts are needed and where they need
to be installed. In the same way, wind and light meters can be
directly connected without having to have a separate BUS
address with its own logic.
Temperature range
So that year round operation is possible even with widely
fluctuating weather conditions, Transclinic xi+ gives reliable
performance outside (built into a combiner boxes) for
guaranteed continuous operation in temperatures ranging from
-20 to +70 °C. Additional reliability comes from the fact that the
current PCB temperature is always measured and available.
Simple system integration
Transclinic xi+ is mounted on a DIN rail in the combiner boxes,
and consumes little power. To connect into customer specific
IT structures, only the MODBUS signal needs to be fed in.
The protocol stack is naturally included with delivery. For PC
based systems, the monitoring data are transferred using a
MODBUS converter to a USB port, and are available there for
further processing.
31
Monitoring systems
Transclinic xi+
Transclinic 4i+
Transclinic 7i+
Transclinic 8i+
Transclinic 14i+
Technical data
Maximum no. of strings
Maximum current per string
Measurement range
Maximum voltage
Supply voltage range
Temperature range
Communication
Analogue input
Number of analogue inputs
Digital inputs
Number of digital inputs
Digital output Solid-state relay
Number of digital outputs
Power consumption
Dimensions
Maximum measurement error
Note
4
7
8
14
30 A DC
3 ... 30 A DC
1000 V DC
19 - 36 V DC
-20 ... +70 °C
Modbus RTU over RS-485
0 ... +10 V or 0 ... 20 mA
2
0 ... 5 V low,15 ... 24 V high
1
20 A DC
3 ... 20 A DC
1000 V DC
19 - 36 V DC
-20 ... +70 °C
Modbus RTU over RS-485
0 ... +10 V or 0 ... 20 mA
2
0 ... 5 V low,15 ... 24 V high
30 A DC
3 ... 30 A DC
1000 V DC
19 - 36 V DC
-20 ... +70 °C
Modbus RTU over RS-485
0 ... +10 V or 0 ... 20 mA
2
0 ... 5 V low,15 ... 24 V high
20 A DC
3 ... 20 A DC
1000 V DC
19 - 36 V DC
-20 ... +70 °C
Modbus RTU over RS-485
0 ... +10 V or 0 ... 20 mA
2
0 ... 5 V low,15 ... 24 V high
max 30 V DC/AC 50 mA
1
< 1500 mW
225 x 109.5 x 92.2
1
max 30 V DC/AC 50 mA
1
< 1500 mW
265 x 109.5 x 92.2
1
max 30 V DC/AC 50 mA
1
< 1500 mW
295 x 109.5 x 92.2
1
max 30 V DC/AC 50 mA
1
< 1500 mW
370 x 109.5 x 92.2
± 1% (from full scale)
± 1% (from full scale)
± 1% (from full scale)
± 1% (from full scale)
Ordering data
Type
Transclinic 4i+
Qty.
1
Order No.
1238100000
Transclinic 7i+
Transclinic 8i+
1
1
1238110000
1238120000
Transclinic 14i+
1
1238130000
Note
Transclinic xi+ in operation
TRANSCLINIC
XI+
MOD
BUS
RS48
5 RTU
supp
ly
24 DC
(+)
ly 24
DC (–
)
supp
32
MODBUS RS485 RTU
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