Siemens YASKAWA 840DI Maintenance Manual page 14

Safety precautions
• The grounding wire from each unit must be connected to the enclosure or the
• Wires for grounding must be in accordance with applicable electrical installation
• The grounding terminal of a motor must be wired to the grounding terminal of the
• All wires to be grounded must be directly connected to a single point with ground
• The grounding point for the control units must not be shared with power devices.
grounding plate directly.
Example grounding wiring
200 VAC
LF
Enclosure
Operating relay
regulations and the internal wiring rules.
corresponding Drive Unit.
Ω
resistance of 100 or less.
Otherwise electric shock, a fire, or malfunction could result.
Otherwise malfunction could result.
MANDATORY
Drive Unit
U
V
W
CN
CN
E
sequence
LF
AVR
Single-point grounding
Ground resistance
100 or less
xiv
M
E
PG