User's Manual

SINVERT PVS 600Series central inverters10
Options for SINVERT PVS 600Series inverters
Basic versions and options
The SINVERT PVS 600Series of inverters can be adapted and
expanded by means of options in order to meet the individual
needs of the plant.
The following 4 options are available:
– PV array grounding
– 1 000 V option
– Symmetry monitoring
– Cabinet heating
PV array grounding
In most cases, PV systems constitute a DC IT system. In a DC IT
system, neither the positive nor negative pole is grounded.
When using certain module types, however, either a positive
or negative grounding of the PV generator is required. It is
only by this grounding that damage to modules and a steady
loss of power can be prevented, i.e. that the maximum yield
can be obtained on a continuous basis.
The "PV array grounding positive pole" option allows functional
grounding of the positive conductor inside the SINVERT PVS
inverter if this is a requirement of the photovoltaic modules
used (e.g. large number of thick-film modules).
The "PV array grounding negative pole" option allows
functional grounding of the negative conductor inside the
SINVERT PVS inverter if this is a requirement of the photovoltaic
modules used (e.g. large number of thin-film modules).
PV systems no longer constitute a DC IT system when their
modules are grounded. For safety reasons, the PV system
must be fenced in and designated as an electrical operating
area. Only qualified electricians may be granted access.
Grounding an active conductor (positive pole or negative
pole) means that the inverter's insulation measuring function
no longer works in the normal way. A hazardous current can
start to flow as soon as the first insulation damage occurs. For
this reason, in the case of positive pole grounding, the current
between the positive pole and ground is measured, and in the
case of negative pole grounding, the current between the
negative pole and ground. When the current increases to a
critical level, the ground connection is automatically separated.
1 000 V option
The 1 000 V option increases the maximum permissible input
voltage of the SINVERT PVS inverter from 820 to 1 000 V.
Provision of this option ensures that the PV plant will enter
operation smoothly even with voltages in excess of 820 V
which can occur, for example, on cold days or in arrays
containing thin-film modules. The option thus maximizes the
potential yield of the installation. The MPP voltage range of
the SINVERT PVS inverter is not changed.
Symmetry monitoring
The "symmetry monitoring" option measures the normalized
currents at the DC inputs internally and cross-compares the
values. If this comparison indicates deviations over time, a
message is generated. The message can be used as a guide to
localizing faults early in sections of the PV generator (e.g. cell
failure).
Cabinet heating
The "cabinet heating" option minimizes the risk of conden-
sation forming on the moisture-sensitive components in the
SINVERT PVS photovoltaic inverter at low ambient tempera-
tures. Reliable operation and maximum energy yields to the
grid are dependent on compliance with the operating tempe-
rature range prescribed for the relevant SINVERT PVS inverter.
This function is recommended for locations at which the
ambient temperature can drop below 7 °C.
Order numbers for the options
Each of the four options has its own order number which is
to be specified in addition to the order number of the basic
version (see "Selection and ordering data", page 23).
SINVERT_PVS.book Seite 10 Donnerstag, 24. Mai 2012 3:01 15
© Siemens AG 2012