Yaskawa AC Drive Z1000 HVAC - Manual (Page 24)

n Ground Wiring
Follow the precautions below when wiring the ground for one drive or a series of drives.
DANGER! Electrical Shock Hazard. Do not touch SW1 or SW2 screws while power is applied to the drive. Failure to comply will result in
death or serious injury.
WARNING! Electrical Shock Hazard. Make sure the protective earthing conductor complies with technical standards and local safety
regulations. Because the leakage current exceeds 3.5 mA, IEC/EN 61800-5-1 states that either the power supply must be automatically
disconnected in case of discontinuity of the protective earthing conductor or a protective earthing conductor with a cross-section of at least
10 mm 2 (Cu) or 16 mm 2 (Al) must be used. Failure to comply may result in death or serious injury.
WARNING! Electrical Shock Hazard. Always use a ground wire that complies with technical standards on electrical equipment and minimize
the length of the ground wire. Improper equipment grounding may cause dangerous electrical potentials on equipment chassis, which could
result in death or serious injury.
WARNING! Electrical Shock Hazard. Be sure to ground the drive ground terminal (200 V class: ground to 100 Ω or less and 400 V class:
ground to 10 Ω or less). Improper equipment grounding could result in death or serious injury by contacting ungrounded electrical equipment.
NOTICE: Do not share the ground wire with other devices such as welding machines or large-current electrical equipment. Improper
equipment grounding could result in drive or equipment malfunction due to electrical interference.
NOTICE: When using more than one drive, ground multiple drives according to instructions. Improper equipment grounding could result in
abnormal operation of drive or equipment.
Refer to Figure i.7 when using multiple drives. Do not loop the ground wire.
Figure i.7 Ground Wiring for Multiple Drives
n Enable the Internal EMC Filter
DANGER! Electrical Shock Hazard. Do not touch SW1 or SW2 screws 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.
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 i.7 shows asymmetrical grounded networks. Asymmetrical networks require first moving the SW1 and SW2 screws to
disconnect the internal ground connection. (Drives are shipped with SW1 and SW2 screws installed at the OFF position.)
Table i.7 Asymmetrical Grounded Network
Grounded at the corner of the delta
L1
L2 L3
Grounded at the middle of the side
L1
L2 L3
i.3 Electrical Installation Safety
24 YASKAWA ELECTRIC TOEP YAIZ1U 01A YASKAWA AC Drive – Z1000 Safety Precautions