49
742.641 | 11.43
EN
7.4
Cooling
The internal temperature control system prevents excessive operating temperatures. If the internal
temperature of the inverter exceeds the derating limit, then the amount of power taken from the
solar modules is automatically adjusted. This reduces the heat emission from the inverter and pre-
vents the operating temperature from becoming too high.
The inverter is convection cooled via fins on the front and rear side. A maintenance-free fan circu-
lates the heat within the closed casing evenly over the entire surface of the casing.
7.5
Grid monitoring
The inverter constantly monitors the mains grid parameters while feeding the grid. If the grid devi-
ates from the legally prescribed specifications, then the inverter automatically switches off. When
the grid again conforms to the legally prescribed specifications, then the inverter automatically
switches on again.
The legally prescribed specifications for the grid parameters are described in
7.6
Data communication
7.6.1
Data
The inverter displays the following data and stores it permanently in the internal memory (EEPROM).
Displays
• Voltage and current of the solar generator
• Power and current fed into the grid
• Voltage and frequency of the power grid
• Energy yields on a daily, monthly and annual basis
• Error conditions, notes
Some of this data can be sent to the devices listed in 7.6.2.
Save (EEPROM)
• Error conditions, notes
• Energy yields on a daily, monthly and annual basis (Tab. 7)
The storage resolution of the energy yield data is as follows:
Energy yield data
Storage resolution/
period
10-minute values
31 days
Daily values
12 months
Monthly values
30 years
Annual values
30 years
Total yield
permanent
Tab. 7: Storage resolution of the energy yield data
7.6.2
Interfaces and connected devices
The inverter communicates with other devices via an RS485 bus. The following applies:
• The inverter has two RS485 interfaces (RJ45 sockets) on the lower side of the casing.
• The beginning and end of the RS485 bus must be terminated; see 7.6.4, p. 51.
• Standard RJ45 cables can be used as bus cables (Cat-5 patch cables, not supplied). Use an
alter-
native data connection cable
for longer connections; see 7.6.3, p. 50.
• The inverters connected to the RS485 bus operate as bus slave units.
• If an optionally available device is connected to the bus, then this device operates as a bus mas-
ter.
• Only 1 master may be connected to the RS485 bus at any given time.
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