21
In
s
tal
la
tion
Wiring
Wiring
Wiring for the inverter and the motor.
Points to be observed
Observe the following points during wiring work:
•
Do not use grid power directory to the pump. Always use an applicable inverter for pow-
ering the pump, or fire may result.
•
Electrical work should be performed by a qualified electrician. Always observe applica-
ble codes or regulations.
•
Do not perform wiring work while electric power is on. Otherwise, an electrical shock or
a short circuit may result. Be sure to turn off the power before wiring work.
Inverter-Motor
Electrically connect the inverter and the motor through the U, V and W lines. See the diagram below for detail.
Wiring diagram
Inverter output terminal
U/T1
V/T2
W/T3
↓
↓
↓
Motor terminal
U
V
W
Black
Gray
White
NOTE
• Connect an electric conduit to the ø21.5mm hole of the motor-terminal box to cover the Inverter-Motor wiring.
• Always check the U, V and W lines are properly connected. Miswiring leads to significant pulsation in a discharge line.
• Do not extend the U, V and W lines longer than 50m. Do not use a shielded cable for the lines.
Inverter-Grid power
Electrically connect the inverter with a grid power through the R, S and T lines. See manufacturer's manuals
for details of the inverter. Install a NFB for easy maintenance.
NFB:
Non-Fuse Breaker
INV:
Inverter
R
NFB
GND
Motor
INV
S
T
U/T1
V/T2
W/T3
U
V
W
Black
Gray
White
Green/Yellow
R
S
T
