Checking The Insulation Of The Assembly - Earth Resistance; Emc Considerations; Earthing Guidelines - ABB ESI-S Installation, Operation And Maintenance Instructions

6.3 Checking the insulation of the assembly – earth resistance
WARNING: Follow the procedure outlined below to check the insulation of the inverter
assembly. Applying other methods may damage the unit.
Every inverter has been tested for insulation between the main circuit and the
chassis/frame at the factory. Therefore, do not make any voltage or insulation
resistance tests (e.g. hi-pot or megger) on the inverter units. Check the insulation of the
assembly by measuring the insulation resistance of the inverter between the Protective
Earth (PE) and all 3 phases shorted together, with main contactor shorted. The auxiliary
fuse box may remain closed, but it is mandatory to disconnect P2 (24V supply), P3
(230Vac in), P4 (ESI-Manager if master), P12 (IGBT) and P20-P21 (to other units) from the
main control board (see
WARNING: Making the test without disconnecting the abovementioned connectors
may damage the inverter.
Use a measuring voltage of 500 Vdc. The insulation resistance must be higher than 500
MW per enclosure.
6.4

EMC considerations

The inverter complies with the following EMC guidelines:
EN/IEC 61000-6-2, Industrial level: Immunity standard for industrial environments.
EN/IEC 61000-6-4, Class A: Emission standard for industrial environments.
6.5

Earthing guidelines

Each ESI-S plate has one marked earth points (PE). The earth point is situated at the
bottom right side of the inverter plate
Figure 29: Identification of the earth point on the ESI-S hardware
For safety reasons and for proper operation of the inverter the earth point of each
enclosure must be connected to the installation's earth (PE). A copper (Cu) cable of
minimum size 16 mm² is recommended but local regulations should also be taken into
account.
Remark: in PEN systems, the earth connection of the inverter must be connected to the
installation's earth (PE) and not to the N-conductor.
40 Electrical design and installation ç Manual Energy Storage Inverter ESI-S
Table 13).
(Figure 29
).
Earth point (PE)