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Ingeteam
Installation manual
External to the unit
Non-grounded units
To check whether the insulation fault is external to the unit, see whether the Rpv+ and Rpv- impedances are displayed
on the display screen (selecting the fifth screen from the monitoring menu). Given an insulation fault, one or both will
be 0 or a low figure.
Disconnect the power and open the DC breaker. If the Rpv+ and Rpv- impedances cease to be invalid, the fault is in
the PV array. If one of them is balancing out and gives an intermediate reading, the inverter is triggering the insula-
tion fault.
Check that the grounding fuse is not installed (see Section "2.4. Location of the components").
Inspect the installation.
Units with positive grounding
To check whether the insulation fault is external to the unit, see whether the Rpv- impedance is displayed on the
display screen (selecting the fifth screen from the monitoring menu). Given an insulation fault, Rpv- will be 0 or a low
figure. (Rpv+ may give a higher value).
Disconnect the power and open the DC breaker. If the Rpv+ and Rpv- impedances cease to be invalid, the fault is in
the PV array. If one of them is balancing out and gives an intermediate reading, the inverter is triggering the insula-
tion fault.
Check that the grounding fuse is installed and working correctly (see Section "2.4. Location of the components").
Should the grounding fuse have fused, it is essential to find and correct the insulation fault before replacing it.
Inspect the installation.
Units with negative grounding
To check whether the insulation fault is external to the unit, see whether the Rpv+ impedance is displayed on the
display screen (selecting the fifth screen from the monitoring menu). Given an insulation fault, Rpv+ will be 0 or a low
figure. (Rpv- may give a higher value).
Disconnect the power and open the DC breaker. If the Rpv+ and Rpv- impedances cease to be invalid, the fault is in
the PV array. If one of them is balancing out and gives an intermediate reading, the inverter is triggering the insula-
tion fault.
Check that the grounding fuse is installed and working correctly (see Section "2.4. Location of the components").
Should the grounding fuse have fused, it is essential to find and correct the insulation fault before replacing it.
Inspect the installation.
Internal to the unit
If the insulation fault is caused by the unit, you must cut the DC power supply and wait 10 minutes before opening
the inverter for the first time.
If the fault is not as specified earlier, it will be necessary to look for it in the DC and/or AC part of the unit.
In the DC part of the unit, you will need to check the arresters and wiring. Using a multimeter, check that the resis-
tance and ground capacitance of each pole of the DC battery bus is the same.
In the AC part of the inverter, check that the resistance of each of the inverter's outputs to ground are in the MΩ
range.
Check that the ground fault is not being produced by the switching filter or the cable associated with the unit's auxil-
iary services.
To check that the ground fault is not being produced by the switching filter, open Q2 and measure the resistance
between phases and ground.
To check that the ground fault is not being produced by the auxiliary services, open QAUX and measure the resistance
between phases and ground.
If the problem is identified, check the correct status of the cabling.
If the problem persists, contact Ingeteam.
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ABB2000IKI01
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