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INSTALLATION GUIDE
MODULAR SUNWAY TG
TE OD
Rev. 03
– 01/06/2018
87/
139
Figure 57: Soft grounding option connection schematic
Installation of the
Soft Grounding
option on SUNWAY TG TE inverters inhibits continual isolation control.
Before connection to grid, the
Soft Grounding
resistor is temporarily disconnected from earth in order to
perform an isolation check on both poles of the photovoltaic field. This enables detection of a fault on the
grounded pole. In case an isolation loss is detected, an alarm is triggered. Please refer to section 4.6.
Installation of the
Soft Grounding
kit on the SUNWAY TG TE inverters involves certain system restrictions:
•
Compatibility with Single Secondary for Multi-MPPT Products
option
must be installed in case the
inverter features multiple MPPTs and is connected to a single secondary transformer.
DANGER
Do not connect any other point of the PV field to earth.
If the neutral is present on the inverter-side winding, this is NEVER to be earthed.
NOTE
Grounding resistor is installed upstream of the DC switch. This ensures polarization of the PV
field even when the DC switch is open.
8.5.
Soft grounding
– Additional safety warnings
DANGER
Always avoid direct contact with the field contactors, provided that the PV plant is in
safety conditions in accordance with the safety procedures described in the manuals of
all the devices connected to the PV field.
DANGER
Earthed-pole systems are NON-IT systems.
The Soft Grounding resistor is not a safety device against direct contacts. The resistor is
NOT designed to safeguard human life but for operational purposes.
If the Soft Grounding resistor breaks open due to a fault, the field may be left floating.
The standard MODULAR SUNWAY TG TE has a PV field connection separate from earth and incorporates
a device for controlling field loss of isolation to earth.