Yaskawa AC Drive Z1000 Bypass Technical Manual - Manual (Page 65)

n Enable the Internal EMC Filter
WARNING! Electrical Shock Hazard. Do not touch SW1 or SW2 screws while power is applied to the drive. Failure to comply could result
in death or serious injury. Before servicing, disconnect all power to the equipment. The internal capacitor remains charged even after the
power supply is turned off. The charge indicator LED will extinguish when the DC bus voltage is below 50 Vdc. To prevent electric shock,
wait for at least the time specified on the warning label, once all indicators are OFF, measure for unsafe voltages to confirm the drive is safe
prior to servicing.
WARNING! Electrical Shock Hazard. Connect the ground cable correctly. Failure to comply could 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.
NOTICE: Keep SW1/SW2 screws positioned together (ON/ON or OFF/OFF). Screws at different positions may cause drive failure.
Note: For floating, impedance grounded, or asymmetrically grounded networks, disconnect the internal EMC filter by moving the SW1/SW2
screws to the OFF position.
Table 3.5 shows asymmetrical grounded networks. Asymmetrical networks require screws SW1 and SW2 to be in the OFF
position. The internal ground connection for the filter is removed when the screws are in the OFF position. (Drives are shipped
with SW1 and SW2 screws installed at the OFF position.)
Table 3.5 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
Three-phase variable transformer without solidly grounded neutral
L1
L2
L3
L1
L2
L3
If EMC is a concern and the network is grounded symmetrically, install the SW1 and SW2 screws to the ON position. Installing
the SW1 and SW2 screws enables the internal EMC filter (Drives are shipped with SW1/SW2 screws installed at the OFF
position).
L1
L2 L3
Figure 3.11 Symmetrical Grounded Network
3.4 Input and Output Power Wiring Connections
YASKAWA ELECTRIC SIEP YAIZ1B 01D YASKAWA AC Drive – Z1000 Bypass Technical Manual 65
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Electrical Installation