SMA SUNNY CENTRAL 900CP XT - Zone Monitoring

10 Function Description
SMA Solar Technology AG
User ManualSCCPXT-E7-BA-en-58114
10.6 Zone Monitoring
The order option "Zone Monitoring" offers the possibility to monitor up to eight input currents of the inverter as
standard, to detect fuse and string failures, and in this way, to minimize the power and yield losses.
SC-COM
SCADA SYSTEM
I/O MODULE
CURRENT
TRANSFORMER
Signal cable
Network cable
CURRENT
TRANSFORMER
CURRENT
TRANSFORMER
CURRENT
TRANSFORMER
CURRENT
TRANSFORMER
CURRENT
TRANSFORMER
CURRENT
TRANSFORMER
CURRENT
TRANSFORMER
DC 1 DC 2 DC 3 DC 4 DC 5 DC 6 DC 7 DC 8
Figure 45: Function principle "Zone Monitoring"
The input currents are monitored by the current transformers installed on the DC rails. The current transformers measure
the input currents and forward the measured values via I/O interface to the communication unit. The communication
unit continually calculates the mean values of the input currents and compares the current measured values with the
mean values. If an input current falls below the mean value by a user-defined tolerance, the communication unit issues
a message. For correct analysis of the input currents, the following must be set:
• Maximum input current for each input
• Tolerance in percent by which the input current may deviate from the mean value
When a deviation occurs, the error message is displayed in the event report, if the error analysis is activated. It can
also be sent to SunnyPortal or, depending on the settings, it can be forwarded by e-mail.