Main Circuit Connection - Delta Electronics AC Motor Drive VFD-EL User Manual

2.3 Main Circuit

2.3.1 Main Circuit Connection

No fuse br eaker
( NF B)
R
S
T
Terminal Symbol
R/L1, S/L2, T/L3
U/T1, V/T2, W/T3
+, -
CAUTION!
Mains power terminals (R/L1, S/L2, T/L3)
Connect these terminals (R/L1, S/L2, T/L3) via a non-fuse breaker or earth leakage
breaker to 3-phase AC power (some models to 1-phase AC power) for circuit protection. It
is unnecessary to consider phase-sequence.
It is recommended to add a magnetic contactor (MC) in the power input wiring to cut off
power quickly and reduce malfunction when activating the protection function of AC motor
drives. Both ends of the MC should have an R-C surge absorber.
Please make sure to fasten the screw of the main circuit terminals to prevent sparks
which is made by the loose screws due to vibration.
Revision August 2008, 2ELE, V1.02
B ra ke Re sisto r( Op tio na l)
MC
R (L1 )
S(L2 )
T(L 3)
E
Explanation of Terminal Function
AC line input terminals (1-phase/3-phase)
AC drive output terminals for connecting 3-phase induction motor
Connections for External Brake unit (BUE series)
Earth connection, please comply with local regulations.
Chapter 2 Installation and Wiring|
BR
B ra ke Un it
BUE
( Op tio na l)
-
+
U (T 1)
V(T2 )
W(T3 )
E
Motor
IM
3 ~
2-9