SMA SSM16-11 - Manual (Page 19)

SMA Solar Technology AG 3 Product Description
Installation Guide SSM16-24-IA-IEN105120 19
3.4 Overvoltage Protection
Integrated surge arresters provide overvoltage protection. The surge arresters protect the inverters
from transient overvoltages. The integrated surge arresters can be monitored in the Sunny String-
Monitor. To guarantee the functionality of the integrated surge arrester, this must be connected to an
external grounding. The connection to ground is provided by a ground terminal.
3.5 Remote Tripping
3.5.1 Remote Tripping as a Shunt Trip
The DC circuit breaker is fitted optionally with a remote trigger which is configured as a shunt trip.
The remote trigger with the shunt trip is used to switch off the DC circuit breaker in an electrically
controlled way. Action of the shunt trip is configured at a voltage between 70% … 110% of the
nominal voltage of the shunt trip U
N
. If a voltage is present at the shunt trip, the DC circuit breaker is
tripped. The DC circuit breaker is controlled via a make contact.
The function of the shunt trip is not guaranteed if a cable breaks, a connection is loose, voltage is too
low or the voltage supply fails. We recommend the use of an uninterrupted voltage supply. The
activation time for safely activating the shunt trip is at least 3 seconds.
After it has been triggered remotely, the DC circuit breaker must be connected again manually.
3.5.2 Remote Tripping as Undervoltage Release
The DC circuit breaker is fitted optionally with a remote trigger which is configured as an undervoltage
release.
Remote tripping with the undervoltage release is used to switch off the DC circuit breaker in an
electronically controlled way. The DC circuit breaker is tripped when there is no voltage at the
undervoltage release, or if the voltage falls below 85% of the nominal release voltage U
N
. After
tripping, the DC circuit breaker can be connected again after the voltage rises above 85% of the
undervoltage release nominal voltage U
N
.
In order to avoid an inadvertent tripping, we recommend an uninterrupted power supply. The
undervoltage release is designed for continuous operation. Activation takes place via a normally
closed contact. The minimum interruption time for reliable tripping of the undervoltage release is
1 second.
After it has been triggered remotely, the DC circuit breaker must be connected again manually.
3.6 Type Label
The purpose of the type label is to identify the Sunny String-Monitor. You will find the type label on
the inside of the right door and on the right external wall of the Sunny String-Monitor. You will find the
following information on the type label:
• Type (Type/Model)
• Serial number (Serial No.) of the Sunny String-Monitor