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Interfaces / remote monitoring
For the purpose of monitoring the PV power plant remotely, the inverter can be connected
directly to the Internet via Ethernet.
The inverter is fitted with a multi-function relay which can be configured for various pur-
poses (status signaling contact, control of self-consumption).
The inverter is fitted with interfaces for remote-controlled shutdown and output control
(active and reactive power control).
Extended functions
The inverter has functions for grid monitoring, limitation of output, reactive power control
and control of self-consumption. These can be configured using MaxTalk 2.
Ventilation
The inverter is air cooled. To a large extent, ventilation is passive via the vertical cooling
fins on the back of the inverter. The fan on the left-hand side of the inverter (not available
with SM4TP and SM5TP2), which is accessible from the outside, sucks in air which is also
directed across the cooling fins. All inverters of the TP series are fitted with an internal
fan.
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Safety installations
Surge protection
The inverter is fitted with surge arresters (varistors) at its input and output. Each DC
input (plus and minus connection) is fitted with a surge arrester. On the AC side, the
phases and the neutral conductor are individually secured with surge arresters. The surge
arresters have a common gas discharge tube to ground. For further information on the
surge arresters, see Section11.
When designing the PV power plant, it may be necessary to provide additional external
lightning protection (overvoltage protection). The inverter has an interface for monitoring
external lightning protection modules.
Fault current monitoring
The inverter has an integrated AC/DC-sensitive leakage current sensor. This recognizes
leakage currents generated due to PV module capacities to ground (capacitive ground
leakage current) or through insulation faults (for example by touching a pole of the PV
generator or a phase). In the case of the permissible leakage current being exceeded, the
inverter disconnects from the grid.
Functions for current and output limitation
The inverter limits the DC feed-in current, the output power and the output current.
