Insulation Monitoring; Warning Notices On The Device - Fronius Primo 208-240 Instructions De Service

Insulation Mon- The inverter is fitted with the following safety function as required by UL 1741
itoring
and the National Electrical Code:

Insulation monitoring

In photovoltaic systems with ungrounded solar modules, the inverter checks the
resistance between the photovoltaic system's positive or negative pole and the
ground potential. In the case of a short circuit between the DC+ or DC- cable
and the ground (e.g., due to poorly insulated DC cables or faulty solar modules)
the inverter disconnects from the grid.
Arc detection/ The inverter is equipped with integrated arc detection/interruption, which de-
interruption
tects and extinguishes serial arcs.
For example, a serial arc can occur after the following errors or situations:
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If a serial arc is detected, the power is switched off and the grid power feed oper-
ation is interrupted. A state code is shown on the display. The state code on the
display must be manually reset before the grid power feed operation can be re-
sumed.
The power shutdown also extinguishes the serial arc.
NOTE!
This product is equipped with a communication interface in line with the "Com-
munication Signal for Rapid Shutdown - SunSpec Interoperability Specifica-
tion".
Power optimizers and other MLPE features in the photovoltaic system can impair
the correct functioning of the arc detection/interruption. When using these kinds
of components, the system installer is responsible for ensuring the correct func-
tioning of the arc detection/interruption. Contact your Fronius Technical Sup-
port for more information.
Warning notices There are warning notices and safety symbols on the inside and outside of the in-
on the device
verter. These warnings and safety symbols must not be removed or painted over
because they are required by the standard. They warn against incorrect opera-
tion, as this may result in serious injury and property damage.
10
Poorly-connected plug connections on the solar module
Poor or defective cable connections on the solar module side, which enable a
connection against the earth potential
Defective solar modules due to problems in the junction box or production
errors, such as high resistance solder connections in individual solar cells
Cables incorrectly connected to an inverter's input terminals