11.3 European Standards
776 YASKAWA SIEPYAIH6B01A HV600 AC Drive Bypass Technical Reference
Make sure that the symmetric grounding network is applied, and install the both screws in the ON position to enable
the built-in EMC filter in compliance with the EMC Directive. The EMC filter switch screws are installed in the OFF
position by default.
WARNING! Electrical Shock Hazard. Disconnect all power to the drive, wait for the time specified on the warning label, and check
the drive for dangerous voltages before you remove covers or touch EMC filter screws. If you touch the screws when there are
dangerous voltages, it will cause serious injury or death.
WARNING! Electrical Shock Hazard. Do not remove covers or touch circuit boards while the bypass is energized. If you touch the
internal components of an energized bypass, it can cause serious injury or death.
WARNING! Electrical Shock Hazard. Ground the neutral point on the power supply of the bypass to comply with the EMC Directive
before you turn on the EMC filter. If you turn ON the EMC filter, but you do not ground the neutral point, it can cause serious injury or
death.
WARNING! Electrical Shock Hazard. Connect the ground cable correctly. If you touch electrical equipment that is not grounded, it
can cause serious injury or death.
NOTICE: To disable the internal EMC filter, move the screws from ON to OFF and then tighten to the specified torque. If you fully
remove the screws or tighten the screws to an incorrect torque, it can cause drive failure.
NOTICE: Move the EMC switch screw or screws to the OFF position for networks that are not symmetrically grounded. If the screws
are not in the correct position, it can cause damage to the drive.
Figure 11.6 Symmetric Grounding
NOTICE: When you use the drive with a non-grounding, high-resistance grounding, or asymmetric-grounding network, put the EMC
Filter screw or screws in the OFF position to disable the built-in EMC filter. Failure to obey the instructions can damage the drive.
Table 11.2 shows asymmetric grounding networks.
Table 11.2 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
Three-phase variable transformer without solidly grounded neutral
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