Yaskawa Z1000U HVAC Matrix Bypass - Manual (Page 89)

Figure 3.9 Ground Wiring for Multiple Bypass Units
n Enable the Internal EMC Filter
If EMC is a concern and the network is grounded symmetrically, install the SW screw to the ON position. Installing the SW
screw enables the internal EMC filter (Drives are shipped with the SW screw installed at the OFF position).
DANGER! Electrical Shock Hazard. Do not touch SW screw while power is applied to the drive. Failure to comply will result in death or
serious injury.
WARNING! Electrical Shock Hazard. Connect the ground cable correctly. Failure to comply may result in 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.
Note: For floating, impedance grounded, or asymmetrically grounded networks, disconnect the internal EMC filter by moving the SW screw to
the OFF position.
Table 3.6 shows asymmetrical grounded networks. Asymmetrical networks require first moving the SW screw to disconnect
the internal ground connection. (Drives are shipped with the SW screw installed at the OFF position.)
Table 3.6 Asymmetrical Grounded Network
Grounded at the corner of the delta
L1
L2 L3
Grounded at the middle of the side
L1
L2 L3
Single-phase, grounded at the end point
L1
N
3.4 Input and Output Power Wiring Connections
YASKAWA SIEP YAIZ1D 01A Z1000U HVAC MATRIX Drive Bypass Technical Manual 89
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Electrical Installation