MGI M4000E series, Instruction Manual

Page: 34 / 215

23
2
INSTALLATION AND WIRING
(4) Connection of the power supply and motor
Three-phase power input
2.2.3 Wiring of the control circuit
(1) Wiring instructions
1) Terminals SD, SE and 5 are common to the I/O signals. These common terminals must
not be grounded to the ground.
Terminals SD and 5 are isolated. Avoid connecting the terminal SD and 5 and the
terminal SE and 5.
2) Use shielded or twisted cables for connection to the control circuit terminals and run them
away from the main and power circuits.
3) The frequency input signals to the control circuit are micro currents. When contacts
are required, use two or more parallel micro signal contacts or a twin contact to
prevent a contact fault.
4) It is recommended to use the cables of 0.3mm
2
to 0.75mm
2
gauge for connection to
the control circuit terminals.
Note: To ensure safety, connect the power input to the inverter via a magnetic
contactor and ground leakage circuit breaker or moulded case circuit
breaker, and use the magnetic contactor to switch power on-off.
MCCB
U V W
U V W
Connect the motor to U, V, W. In the above
connection, turning on the forward rotation switch (signal)
rotates the motor in the counterclockwise (arrow) direction
when viewed from the load shaft.
Motor
(Phase sequence need not be matched.)
Ground
Ground
terminal
Three-phase
power supply
R
(L
1
)
S
(L
2
)
T
(L
3
)
R
(L
1
)
S
(L
2
)
T
(L
3
)
The power supply cables must be connected
to R, S, T (L
1
, L
2
,L
3
). If they are connected to
U, V, W, the inverter will be damaged.
M4500E.book 23 ページ ２００５年２月２２日 火曜日 午後５時７分