Fronius Fronius IG Plus 100, Operating Instructions Manual

Page: 90 / 157

82
Display Values
in ‘Now’ Dis-
play Mode
(continued)
Solar module voltage
Voltage (in volts) currently present
at the solar modules
Module current
Current (in amperes) that is cur-
rently being supplied by the solar
modules
Module temperature (optional)
Temperature at the solar modules
(°C can be changed to °F in the
setup menu, temperature sensor
no. 1, sensor card option)
Insulation resistance of the pho-
tovoltaic system
(MOhm)
For ungrounded solar modules
WARNING! An electrical shock can be fatal. The positive and
negative poles of the photovoltaic system should never be
touched with an insulation resistance of < 500 kOhm.
An insulation resistance of < 500 kOhm may be due to an
inadequately insulated DC lead or defective solar modules. In
the event that the insulation resistance is too low, you must
contact your Fronius service partner.
Example of display for negative
potential (polarity sign ‘-’)
Short circuit between DC lead and
ground
The voltage displayed while power is being fed into the grid corresponds
to the so-called MPP voltage (MPP = maximum power point).
The insulation resistance is the resistance between the positive or negati-
ve poles of the photovoltaic system and the ground potential. If an insula-
tion resistance > 500 kOhms is shown, this means that the photovoltaic
system is adequately insulated.
An insulation resistance of less than 500 kOhms indicates a error.
When the insulation resistance is less than 10 MOhms, the display diffe-
rentiates between:
-
negative potential and the ground (polarity sign ‘-’)
- positive potential and the ground (polarity sign ‘+’)