Omron Q2A Series Technical Manual page 183

5.2 European Standards
WARNING! Electrical Shock Hazard. Make sure that the power to the drive is OFF and the CHARGE LED light is OFF before
you move the EMC filter screw or screws. Failure to obey could cause death or serious injury.
WARNING! Electrical Shock Hazard. Do not remove covers or touch circuit boards while the drive is energized. Failure to obey
can cause death or serious injury.
WARNING! Electrical Shock Hazard. Ground the neutral point on the power supply to comply with the EMC Directive before
turning on the EMC filter or if there is high resistance grounding. If the EMC filter is switched ON without the neutral point being
grounded or if there is high resistance grounding, it can cause death or serious injury.
WARNING! Electrical Shock Hazard. Connect the ground cable correctly. Failure to obey can cause death or serious injury.
NOTICE: When disabling the internal EMC filter, move the screws from ON to OFF and then tighten to the specified torque.
Completely removing the screws or tightening the screws to an incorrect torque may cause drive failure.
NOTICE: Move the EMC switch screw or screws to the OFF position for networks that are not symmetrically grounded. Failure
to obey can cause damage to the drive.
Make sure that the symmetric grounding network is applied, and install the screw or screws in the ON position to
enable the built-in EMC filter in compliance with the EMC Directive. The EMC filter switch screw or screws are
installed in the OFF position by default.
Figure 5.7 Symmetric Grounding
NOTICE: When operating the drive with a non-grounding network, high resistance grounding, asymmetric grounding network,
install the screw or screws in the OFF position to disable the built-in EMC filter. Failure to obey the instructions can damage the
drive.
Table 5.4 Asymmetric Grounding
Type of Grounding Diagram
Grounded at the corner of the delta connection
Grounded at the middle of the side
Single-phase, grounded at the end point
5
Three-phase variable transformer without solidly grounded neutral
SIEPYEUOQ2A01A AC Drive Q2A Technical Manual 183