3 Installation
27
Assignment of sensor connection
Sensor
connector pin
assignment
Sensor
connection
designation
Solar Inverter
connection
Pin 1
Plus signal
temperature
Temp
Pin 2
Plus signal
irradiance
Solar
Pin 3
Reference earth
V-
Pin 4
Plus connection for
5V
V+
Connecting alarm relay
The Solar Inverters are equipped with a potential-
free alarm relay as standard. The relay can be
designed as a make-contact element or as a break-
contact element and is actuated for all malfunctions
signalled by the device. This ensures a faster, more
reliable indication of a possible fault in the PV sys-
tem on site. For PV systems with several Solar Invert-
ers, the individual relays can be switched in parallel
and connected via a common indicator lamp.
The master also signals faults from other devices in
the CAN network via the alarm relay. It is therefore
sufficient for simple alerting to connect the alarm
relay of the master.
CAUTION
The alarm relay is designed for 230 V/2 A. Higher
outputs/voltages can result in the relay being
destroyed. The connected signalling device must
be fused separately. The terminals are intended for
a cable cross-section of 0.2 mm
2
to 1.5 mm
2
. When
dimensioning the cross-section, also take the current
consumption of the connected signalling device into
account.
Wiring diagram for a single device
~
1
2
NO
NO
NC
NC
C
C
Wiring diagram for several devices
~
1
2
NO
NO
NC
NC
C
C
NO
NO
NC
NC
C
C
1 Indicator lamp, red
2 Indicator lamp, green
The Solar Inverter is supplied by the feed-in phase
from the AC grid. If the feed-in phase fails the alarm
relay cannot switch, even in the event of a fault.